vlt-min-esp-13520-0217 missionxiii paranal 201602 · 6/36% espressoproject% % 1.2.2...

Name Date Signature

Name Date Signature

Name Date Signature

ESPRESSO

Paranal Mission XIII – 2016–02

2016 1st Coudé Train Installation Mission Report

VLT-‐MIN-‐ESP-‐13520-‐0217, Issue 1.0

February 22nd, 2016

Prepared Alexandre Cabral 22/02/2016 Approved Denis Mégevand 29/02/2016 Released Francesco Pepe

Instituto de Astrofísica e Ciências do Espaço / Universidades do Porto e Lisboa

INAF, Osservatorio Astronomico di Trieste INAF, Osservatorio Astronomico di Brera

Observatory of the University of Geneva Physics Institute, University of Bern Instituto de Astrofísica de Canarias

European Southern Observatory

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 3/36

Change Record

Issue/Rev. Date Section/Page affected Reason/Remarks 1.0 22/02/2016 First issue

Other Authors: Manuel Abreu, António Oliveira, Denis Mégevand, Gerardo Ávila, Gaspare Lo Curto, Matteo Aliverti, Giorgio Pariani

Table of Contents Chapter 1. Introduction .............................................................................................................................................. 5 1.1 Scope of the Document ........................................................................................................................................................ 5 1.2 Documents ................................................................................................................................................................................ 5 1.2.1 Applicable Documents ................................................................................................................................................................ 5 1.2.2 Reference Documents .................................................................................................................................................................. 6

1.3 Acronyms ................................................................................................................................................................................... 6 1.4 Participants and interacting ESO and LPO staff ........................................................................................................ 6

Chapter 2. Executive Summary ............................................................................................................................... 7 Chapter 3. Report .......................................................................................................................................................... 8 3.1 Day 1: 09.02.2016 (Tuesday) ............................................................................................................................................ 8 3.2 Day 2: 10.02.2016 (Wednesday) ..................................................................................................................................... 9 3.3 Day 3: 11.02.2016 (Thursday) ...................................................................................................................................... 10 3.4 Day 4: 12.02.2016 (Friday) ............................................................................................................................................. 11 3.5 Day 5: 13.02.2016 (Saturday) ........................................................................................................................................ 17 3.6 Day 6: 14.02.2016 (Sunday) ........................................................................................................................................... 19 3.7 Day 7: 15.02.2016 (Monday) ......................................................................................................................................... 22 3.8 Day 8: 16.02.2016 (Tuesday) ......................................................................................................................................... 25 3.9 Day 9: 17.02.2016 (Wednesday) .................................................................................................................................. 27 3.10 Day 10: 18.02.2016 (Thursday) ................................................................................................................................. 29 3.11 Day 11: 19.02.2016 (Friday) ....................................................................................................................................... 30 3.12 Day 12: 20.02.2016 (Saturday) .................................................................................................................................. 33 3.13 Day 13: 21.02.2016 (Sunday) ...................................................................................................................................... 35

Chapter 4. Postponed tasks and AI ..................................................................................................................... 36

List of Figures Figure 1 –FEU situation at arrival and unpacked flanges. ................................................................................................. 8 Figure 2 –Work at FEU. ..................................................................................................................................................................... 9 Figure 3 – P5P6 cabinet and cables at UT4. .......................................................................................................................... 10 Figure 4 – CCD Camera at CCL ceiling (with and without Lens for Tip/Tilt and XY alignment) and laser

mounted on the rotating platform. ................................................................................................................................ 11 Figure 5 – Cables at P5 location and IGUS pipe from P5 location to inner track, for conveying of P6 motor

cable (UT4). .............................................................................................................................................................................. 12 Figure 6 – Laser beam shined into the 4 tunnels for first clock and height alignment. .................................... 13 Figure 7 – Measurements of Laser beam position at CR with photos taken from CCL. ..................................... 14 Figure 8 – Path of Genie for the test on the Displacement of FEU Laser in UT1 CR incoherent duct. ......... 15

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Figure 9 – Displacement of FEU Laser in UT1 CR incoherent duct. ............................................................................ 15 Figure 10 – Path of Genie for the test on the Displacement of FEU Laser in UT3 CR incoherent duct. ...... 16 Figure 11 – Displacement of FEU Laser in UT3 CR incoherent duct. ......................................................................... 16 Figure 8 – P7R8 tube and the interference with M7 thread and adjusting screw (worst case in UT2). .... 17 Figure 9 – Test of PRS initialization repeatability ............................................................................................................. 18 Figure 14 – Above: 2 spots (0° and 180°) of one image; Below: x,y values for 0° and 180°. The value of

the barycentre is calculated averaging the 50 values. ........................................................................................... 20 Figure 15 – Above: 2 spots (0° and 180°) of one image before and after sigma clipping; Below: x,y values

for 0° and 180°. The value of the barycentre is calculated averaging the 30 values. ............................... 21 Figure 16 – Prism mounted and aligned in vertical direction. ..................................................................................... 21 Figure 17 – Gerardo Ávila calculations on FRD loss due to tilt on the FEU structure. ....................................... 22 Figure 18 – Cabinets installed for the CT. Left P5P6 and right P7 and, from top to bottom, UT1 to UT4. 23 Figure 19 – Mean value and the standard deviation obtained from 15 second of continuous acquisition.

....................................................................................................................................................................................................... 24 Figure 20 – Final results comparing the values acquired with the LT and the ones obtained shining the

laser in the 4 CR with and without the genie near the FE structure. .............................................................. 25 Figure 21 – Turbulence analysis performed on all UTs (day time). ........................................................................... 26 Figure 22 – Turbulence analysis performed on UT4 during day time (left) and night time (right).. .......... 26 Figure 23 – Manuel and Antonio near one of the P5P6 cabinets installed in the Azimuth platform. .......... 27 Figure 24 – LAT alignment on the VLTi Delay Line Lab. ................................................................................................. 28 Figure 25 – Spots on the Camera Sensor for the LAT alignment (left centre reference measured at the

end of the alignment to confirm stability and right the aligned spot after mirror tip tilt blocking). 29 Figure 26 – LAT at Nasmyth tube in the VLT UT3 unit centre piece. ........................................................................ 30 Figure 27 – Characteristics of the GP sensor from VLT-‐SPE-‐ESO-‐11420-‐0675. ................................................... 30 Figure 28 – Tip tilt variation measured with pupil beacon power during telescope altitude variation. The

telescope went from 17° to 89° and back. The large sport corresponds to the first measurement. The displacement from maximum was calculated considering the decrease in measured power. .. 32

Figure 29 – XY variation on the GP during telescope altitude variation. The large sport corresponds to the first measurement. The red cross corresponds to the central pixel. ....................................................... 32

Figure 30 – Tip tilt variation measured with pupil beacon power during telescope altitude variation. Optimized alignment for 65°. ........................................................................................................................................... 33

Figure 31 – XY variation on the GP during telescope altitude variation. Optimized alignment for 65°. .... 34 Figure 32 – XY distance from central pixel as a function of altitude angle. ............................................................ 34

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 5/36

Chapter 1. Introduction

1.1 Scope of the Document This is the report of the ESPRESSO first Coudé Train installation mission. Mission started on the 9th of February (arriving on the mountain) and ended on the 21th of February (leaving the mountain). The main purpose of this mission was the installation of the CT electronics and cabling, modification of the FEU laser alignment source and the testing of the Nasmyth Laser alignment tool for the CT future installation. The consortium team composed by, A. Cabral, A. Oliveira and M. Abreu, all for the Coudé Train work, G. Avila for the CT alignment, M. Aliverti and G. Pariani for the FEU related work, and D. Mégevand, as PM. The team was helped by ESO customer G. Lo Curto, the contratists from Conyser and several people from Paranal and from Mecatronics workshop, see the section 1.4

1.2 Documents The main applicable and reference documents are listed hereafter. 1.2.1 Applicable Documents AD-1 ESPRESSO Statement of Work VLT-‐SOW-‐ESO-‐13520-‐5059 1 01.02.2011 AD-2 ESPRESSO Technical

Specifications VLT-‐SPE-‐ESO-‐13520-‐4633 3 01.02.2011

AD-3 ESPRESSO Project Plan VLT-‐PLA-‐ESP-‐13520-‐0007 5 25.03.2013 AD-4 ESPRESSO Management Plan VLT-‐PLA-‐ESP-‐13520-‐0015 4 25.03.2013


1.2.2 Reference Documents RD-1 ESO-‐Paranal Observatory ICD VLT-‐ICD-‐ESO-‐13529-‐5412 2 25.03.2013 RD-2 Upgrades to Paranal

Observatory Technical Infrastructure

VLT-‐TRE-‐ESO-‐13529-‐5411 2 25.03.2013

1.3 Acronyms 1T Front-‐End Unit room in the CCL A/C Air Conditioning AD Applicable Document AI Action Item ANF Antofagasta Airport CCL Combined Coudé Laboratory CR Coudé Room CT Coudé Train ESPRESSO Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations FEU Front-‐End Unit LFC Laser Frequency Comb LT Laser Tracker OD Optical Density PAO Paranal Observatory PM Project Manager PRS FEU Rotary Stage RD Reference Document UT Unit Telescope VLT Very Large Telescope VLTi Very Large Telescope interferometer

1.4 Participants and interacting ESO and LPO staff ACA Alexandre Cabral (ESP) AOL António Oliveira (ESP) CRA Cristian Ramirez (ESO PAO) DME Denis Mégevand (ESP) EFU Eloy Fuenteseca (ESO PAO) GAV Gerardo Avila (ESP, ESO) GLC Gaspare Lo Curto (ESO) GPA Giorgio Pariani (ESP) HBA Herman Barrios (PAO, Conyser contratists responsible) MAB Manuel Abreu (ESP) MAL Matteo Aliverti (ESP) NHA Nicholas Haddad (ESO PAO) PVH Pierre Van der Heiden (ESO PAO) RAB Roberto Abuter (ESO)

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Chapter 2. Executive Summary All 8 CT cabinets (P5P6 and P7 for all 4 UTs) installed and tested. Power available in the cabinets in azimuth platform, not yet in the ones in the CR (although cabling is present). FEU alignment strategy modified as planned and toggling table re-‐aligned within ±100 µm in XY and ±5 arcsec in tip/tilt fully compliant with requirements. CT alignment: strategy for materializing the altitude axis tested successfully. Alignment accuracy of ±200 µm in XY and ±0.5 arcmin in tip/tilt at 65° altitude, fully compliant with requirements. For the complete Altitude range, alignment changes shifts by maximum 1.4 mm in XY and 0.6 arcmin in tip/tilt. The stability of the CCL floor was tested using a weight of 2 tons, and an effect is noticeable at proximity of the convergence axis. At the position of the vacuum vessel, the effect of this weight was lost in the noise. Taking in to account that the weight of the spectrograph is 4 times superior, we can extrapolate that an effect of the order of a few mm in the CR (about 5 arcsec per mm) may affect the vertical position of the laser in UT2 and UT3, at the end of the light duct. If this is verified, it might be necessary to re-‐align the rotation axis of the Front End Unit. We consider that any weight inferior to the ton put in the CCL "public" part will have no dramatic effect. Higher loads may have to be coordinated with the ESPRESSO Consortium.


Chapter 3. Report

3.1 Day 1: 09.02.2016 (Tuesday)

1. Arrival at the Paranal observatory 2. Preparation of ESPRESSO room (LFC) for the mission. 3. Opening box with CT electronics stuff arrived from Europe (3 days before). 4. Verification of all components and cabinets: everything ok. 5. Labelling cabinets with CT device identification codes plus sticker with cabinet

identification. 6. Moving all CT components to thermal enclosure entrance. 7. Fabrication of a new feedthru on the telescope wall with two Igus connector tips and a

length of Igus pipe. Igus tips were machined at mechanical workshop to obtain full hole clearance in these pieces. Tested for clearance for 3 cables, ok.

@UT4-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 8. Hanging P5/P6 cabinet in azimuth location

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

9. Checked laser software and checked camera software/ PRS software. 10. Different exposure time where tried / OD filter / sampling strategy to optimize the

barycentre calculation (actually standard deviation of about 2 µm). 11. Pentaprism dismounted.

Figure 1 –FEU situation at arrival and unpacked flanges.

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3.2 Day 2: 10.02.2016 (Wednesday)

1. António Oliveira and Giorgio Pariani did the security course. 2. The Genie was entered in the CCL/1T for the FEU Laser work.

@UT4-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

3. Verification of fixing positions for the igus piping inside telescope tubes. 4. Verification of fixing positions for the igus piping inside inner track. 5. Herman Barrios and crew hanged P7 cabinet outside UT4 CR. 6. Mounting of IEC power plug on ESO provides power cable. 7. PVH from ESO mounted 10A breaker on power cabinet close to cabinet for powering up

AC line for cabinets.

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 8. Mounting of the TS-‐FL interface place (check clock). 9. Removing the laser from the ceiling. 10. Mounting the CCD camera on the ceiling. Some pieces had to be modified by the

workshop. 11. Mounting the laser on the TS-‐FL interface plate. 12. Clock alignment between laser and camera. 13. Test of the alignment procedure.

Figure 2 –Work at FEU.


@CCL-‐A/C Unit-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 14. A/C computer completely blocked, screen seems OK but no reaction apart of a small bip

when repowered. GLC asked the IT people to have a look.

3.3 Day 3: 11.02.2016 (Thursday)

1. Gerardo Avila arrived. 2. DME had the introduction to the Sequani operation with CRA

@UT4-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

3. Final marking of drill holes for fixing Igus pipe holders in both azimuth and inner track locations.

4. Herman Barrios drill holes and fixed Igus pipe holders. 5. -‐ Layout pipes in final position for P6 and P5 locations. 6. -‐ Laying out motor cables for P6 and P5 functions. 7. -‐ Motor and Cables tested ok. 8. -‐ Verification of Alignment source / cover actuation: ok. 9. -‐ Verification of alignment source fiber produced by Gerardo: ok by eye, to be measured

later in one of the UTs. NOTE: Only one bundle was produced due to later arrival of purchased fibres. One will be tested and assembled and the others will be integrated in next mission.

10. Moved parts and tools to UT1 location.

Figure 3 – P5P6 cabinet and cables at UT4.

@UT4-‐InnerTrack-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

11. The position of the P7-‐R8 tube and its protections on UT4 inner track was analysed.

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12. There are a thread and an adjusting screw that define the limit (being the screw the worst case). For the adjusting screw we will have to create a 5 cm space between protections.

13. The use of a 0.5 m length protection was tested and with Gaspare it was decided that we will use 3 of 0.5 m. As decided with Gaspare, there is no need to protect the Prism box, and therefore the 1.5 m length is enough.

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 14. Clock alignment (relative camera -‐ laser). 15. Tip tilt laser alignment (accuracy below ±5 arcsec). This corresponds to less than 1.5 mm

accuracy at 60 m, well below the final success criteria. 16. XY laser alignment (below 100 µm). 17. Prism mounted and roughly aligned in vertical direction. 18. Tip tilt laser alignment verification comparing the results obtained with different rotation

angles (differences below ±2 arcsec).

Figure 4 – CCD Camera at CCL ceiling (with and without Lens for Tip/Tilt and XY alignment) and laser

mounted on the rotating platform.

@CCL-‐A/C Unit-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

1. A/C computer reset by IT people. Alpiq could then reconnect remotely the Beckhof to the PC.

2. EFU and his team came to check and finetune the cooling water supply flux. Leak detector also checked by NHA. Green light to launch the long term tests.

3.4 Day 4: 12.02.2016 (Friday)

1. Herman Barrios & crew installed P7 cabinets on UT1, UT2 and UT3, comprising the process of drilling holes for M8 anchors, installation of vibration dampers and fixing cabinet in place.


@UT1-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 2. Installation of P5/P6 cabinet in metallic anchors in the azimuth platform (already in

place), telescope wall. 3. Mounting of cable feed through from cabinet side to P5 location, internal to telescope. To

note that all tasks performed by Herman Barrios in UT4, drilling holes and installing pipe holders, were now performed by Espresso staff for all the remainder installation activities.

4. Drilling, riveting and fixing of IGUS cable holders inside telescope, near to P5. Holders were also provided to allow wrapping of excessive cable (this was done for P5 and P5 motor cables). Same solution applied to all the telescopes.

5. Drilling, riveting and fixing of IGUS cable holders inside the inner track, close to P6 location.

6. Laying out of IGUS pipe from P5 location to inner track, for conveying of P6 motor cable.

Figure 5 – Cables at P5 location and IGUS pipe from P5 location to inner track, for conveying of P6 motor

cable (UT4).

7. Testing of cable health (P5 and P6) by connecting a PiMICOS stage and running

preconfigured commands (homing, goto position +150, go to position +10, homing). This test was performed by connecting a laptop to the PLC secondary Ethernet port (X001) with a crossover cable, and running the commands under twincat environment. Tests OK.

8. Test of switching on/off the alignment source, using the laptop connected to the PLCS. Tested OK.

9. Installation of P7 cabinet outside CR on UT1. Mounting of IEC plug on AC line that provides power to the cabinet.

10. Accessing inner track and from M9 location, insertion of P7 motor cable on a hole on the ceiling of UT1 CR.

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11. Removing plastic cable tray covers on ceiling of CR in order to allow installation of motor cable. Maintenance of cable tray. Installation of extra screws to insure better holding (correction of work done in previous mission).

12. Insertion of plastic protection on the feedthru on the CR door frame. 13. Laying out of motor cable. Fixing cable outside CR with Igus plastic holder (and pipe).

Putting back the cable tray covers. Inserting excess cable back to Inner track. Access to inner track and wrap up excess P7 cable around the aperture on M9 location ( below wood plate).

14. Test P7 cable health using the same procedure described before. 15. Finished installation of UT1, bringing all materials to UT2.

@UT1-‐InnerTrack-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 16. The position of the P7-‐R8 tube and its protections on UT1 inner track was analysed. 17. For the thread the protection might be lowered 1 cm (as the thread is at the level of the

nominal height and there is a margin of 2 cm for the tube). For the adjusting screw we will need to position the two 0.5 m length protections with it in between (this is all explained in the videos made in all UTs).

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 18. Laser beam shined into the 4 tunnels for first clock and height alignment.

Figure 6 – Laser beam shined into the 4 tunnels for first clock and height alignment.

19. For the rough alignment in the beam height and clock, the laser beam was pointed to the

CR for each UT, and an imaged was acquired from the CCL (camera with 250mm zoom). The image was then processed with a Matlab software that a) identifies the mounting flange in the CR (gradient method for edge detection)


b) crops the image around the flange hole c) rescale the image (mm/pixel) d) finds the beam centroid.

20. This software was able to calculate the horizontal and vertical misalignment with a repeatability of ±1mm in vertical direction and ±0.8mm in horizontal direction. (2σ values obtained by 5 photos taken for each Coudé train). The difference between those values and the ones obtained with the camera placed directly in the Coudé room (ACA method) are always between 0.5 and 1.5 mm.

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Figure 7 – Measurements of Laser beam position at CR with photos taken from CCL.

21. In order to evaluate the influence of the CCL floor (and its “membrane” behaviour) on the

FEU laser beam, a series of tests were performed using the Genie (1900 kg) around the CCL area. The following figures and graphs show the measured displacement of the FEU Laser beam on the UT1 and UT3 CR incoherent duct entrance while the Genie was moving. As seen, the weight of the Genie near the FEU structure thus influence the alignment of the FEU structure, with a maximum value of 15 arcsec for UT1. It must be noted that this effect is only noticeable when the Genie is near the FEU structure.

22. In order to test de repeatability of the measurements, the test on UT1 was repeated with a similar Genie path (at different speed) and similar results were obtained.

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Figure 8 – Path of Genie for the test on the Displacement of FEU Laser in UT1 CR incoherent duct.

A B C D E F G H I

1 mm displacement => 3.2 arcsec

Figure 9 – Displacement of FEU Laser in UT1 CR incoherent duct.


M K

JIH

G

B

C

A

DE

F

L

UT3

Figure 10 – Path of Genie for the test on the Displacement of FEU Laser in UT3 CR incoherent duct.

G H I J K L M

1 mm displacement => 3.6 arcsec

A D E F G H I J K L M

Figure 11 – Displacement of FEU Laser in UT3 CR incoherent duct.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 17/36

3.5 Day 5: 13.02.2016 (Saturday)

@UT2-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 23. Mounting P5/P6 and P7 cabinets on UT2 using the same procedure as described before

for UT1 cabinets installation. 24. Testing of relevant cabinet functions. Tests OK 25. Placing cable labels near cabinets and close to respective stage location in UT1 and UT2. 26. Bring all materials to UT3.

@UT2-‐InnerTrack-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

27. The position of the P7-‐R8 tube and its protections on UT2 inner track was analysed. 28. This is the worst case and the protection must be cut with two openings for the thread

and for the adjusting screw. Also the P7-‐R8 tube must be cut about 1 cm (and closed with a flat part). All the dimensions are described in the videos.

Figure 12 – P7R8 tube and the interference with M7 thread and adjusting screw (worst case in UT2).

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

29. Test of PRS initialization repeatability (Figure 13). The toggling system has been moved to the optical switch a number of times with different approach speeds. The difference in the initializing position is related to the delays due to the MoCo controller. Just keeping a constant speed during the initialization process (fixed to 0.1°/s) strongly increases the repeatability to about ±1asec.


Figure 13 – Test of PRS initialization repeatability

30. Tilt verification between toggling system and CR flanges shining the laser in the 4 UTs

(results shown at the end of the document) 31. The Genie has been removed from the CCL.

The difference in tiptilt of the plane generated by the toggling system with respect to the best fit of the CR flanges centres in the 2 conditions was compared. Shining the laser in the tunnels we found a difference between 9.7 arcsec and 15.8 arcsec depending of the method used (respectively Alex Camera in the CR or Giorgio photographic machine with f250 objective looking from the CCL). The value obtained by the camera mounted on the ceiling of the CCL was 10.5 arcsec.

@ISSUE_OF_THE_DAY-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

During some repeatability tests the stage passed over the optical switch. Previously the optical switch was activated just for counter-‐clockwise rotation and not for clockwise rotation. Due to a command bug the stage overtakes the switch causing an entanglement of the laser cables. The cables pull the laser out of its housing causing a full misalignment of the laser itself.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 19/36

3.6 Day 6: 14.02.2016 (Sunday)

@UT4-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. Finishing UT4 P7 installation. UT3 was not accessible until 11PM. 2. Installation of P7 cabinets according to procedure described before. 3. Test of P7 cable health, and cabinet relevant functions. Tests OK 4. Placing labels on motor cables 5. Finished UT4 Installation.

@UT3-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 6. Starting P7 installation in UT3. Installation of P7 cabinets and cables according to

procedure already described. 7. Running relevant tests. Tests all ok. 8. Placing Labels on P7 motor cable. 9. Installation of UT3 P5/P6 cabinet and motor cables according do procedure above. 10. Running relevant tests. Tests all ok 11. Placing labels on P5/P6 motor cables. 12. Finished UT3 installation

@CT-‐Cabinets-‐in-‐All-‐UTs-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

13. This finished all cabinet installations: there are a few items to complete which are of responsibility of ESO:

o Cabinets in P5/P6 and P7 locations in all UTs do not have yet comm connections o All P7 locations in all UTs do not have yet a live power connections

14. Meeting at LFC room to discuss on solutions that may have to be implemented to reduce power of the alignment source (on P5/P6 cabinets) below the minimum power level allowed by the Thorlabs LED circuitry on the cabinet. Due to the error status signal required for committing the PLC twin cat device that actuates this source, it may be necessary to have extra means to reduce power by optical/mechanical means below the electrical threshold levels. This error status signal is triggered when the current flowing in the led is lower than a certain threshold (it may be configured in the electrical circuit of the LED power supply), indicating LED source malfunction. Solution similar to DTS0074 from OZ-‐optics may be required. This is a in line fiber attenuator that could be installed inside the cabinet, inline with the patch cable connection the LED source to the interconnection plate on the bottom of the cabinet. Gerardo Avilla shall evaluate the adequate level of attenuation and the type of attenuator to be mounted inside the cabinets. This provision shall be installed in June mission for UT4.


@UT3-‐InnerTrack-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 15. The position of the P7-‐R8 tube and its protections on UT3 inner track was analysed. 16. This is the more relaxed case. Both the thread and the adjusting screw are 10 mm above

the protection at the nominal height of 180 mm. @CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

1. Clock alignment (relative camera -‐ laser) in order to match xy laser variation with xy CCD variation.

2. Tip tilt laser alignment ( below ±5 arcsec ): The tip tilt measures have been done reducing the power of the laser in order to remove the OD5 filter. This was made to avoid errors due to the filter wedge (estimated about 15 arcsec). The final result are (3 repetitions): Theta x =4.9±0.1 Theta x =5.0±0.1

Figure 14 – Above: 2 spots (0° and 180°) of one image; Below: x,y values for 0° and 180°. The value of the

barycentre is calculated averaging the 50 values.

3. xy laser alignment (below 100 microns):

The final results are: x direction -‐15 y direction -‐109

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 21/36

Figure 15 – Above: 2 spots (0° and 180°) of one image before and after sigma clipping; Below: x,y values for

0° and 180°. The value of the barycentre is calculated averaging the 30 values.

4. Prism mounted and aligned in vertical direction. The height of the pentaprism has been corrected using the values obtained by the camera from the CCL (objective f250).

Figure 16 – Prism mounted and aligned in vertical direction.


5. In order to evaluate the effect of the tilt in the FEU structure measured yesterday (with FEU Laser) on FRD losses, Gerardo Ávila did some calculations shown in the following figure. As seen, the 0.25 arcmin tilt measured (in the worst case of UT1 with Genie near the structure) will produce an FRD loss much lower than 1% (1% loss is for a 1.5 arcmin tilt).

Figure 17 – Gerardo Ávila calculations on FRD loss due to tilt on the FEU structure.

3.7 Day 7: 15.02.2016 (Monday)

@CT-‐Cabinets-‐-‐-‐ -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. Alignment source Fiber measurement regarding coupling efficiency, uniformity between

fiber ends and min/max intensity levels allowed by the led source. Measurements were done in both UT4 and UT3. The results showed compliance with success criteria: uniformity between 100 µm fibers is better than 4% and coupling efficiency in the order of 1.9% for the 100 µm fiber and 0.6% for the 50 µm.

2. Along with Gerardo Avila and Alexandre Cabral, tested layout of fiber in P5 location in order to check length requirements and possible fixation points. Conclusions led to reduction in total length of the alignment source fiber from 7.5 m to 6.5 m and increase in 10 cm the length of the independent fiber patches after the spliced section.

3. Crosscheck of all cabinets for labelling, connections or any other issue regarding installation. Corrected or added labelling (in cables) when needed. All cabinets are OK.

4. Need to print out cabinet schematics to place paper copies in each cabinet. Schematics were updated and Gaspare LoCurto shall print them out.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 23/36

Figure 18 – Cabinets installed for the CT. Left P5P6 and right P7 and, from top to bottom, UT1 to UT4.


5. Meeting with RAB (ESO) regarding the future installation of engineering network in the

observatory, dealing with all PLC/Beckhoff instruments. Several solutions were discussed, all implying more or less intrusive modifications on the cabinets, considered critical at this phase of the CT electronics commissioning. To be decided the actual solution and the timing for its implementation.

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 6. Check form the CR for CR flange vs PRS planes verification.

The laser has been shined in all the UTs to correct the height and the clock. The mean value and the standard deviation obtained from 15 second of continuous acquisition are shown below:

Figure 19 – Mean value and the standard deviation obtained from 15 second of continuous acquisition.

7. Following figures show the final results comparing the values acquired with the LT and

the ones obtained shining the laser in the 4 CR with and without the genie near the FE structure.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 25/36

Figure 20 – Final results comparing the values acquired with the LT and the ones obtained shining the laser

in the 4 CR with and without the genie near the FE structure.

3.8 Day 8: 16.02.2016 (Tuesday)

@CT-‐Cabinets-‐-‐-‐ -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. Meeting with the LPO IT responsible, Daniel Gaytan in order to evaluate the several

solutions available to connect the engineering network to the PLCs. Three base solutions were advanced, all implying effort to be committed in the alteration of the cabinets. These are:

o In P7 cabinet location (bodega), access directly the local switch using a UTP copper cable. This implies modifications on the cabinet: RJ45 feedthru on the bottom flange, extra UTP patch cable to connect to secondary port of PLC.

o In P7 (or P5/P6) location, access to other pair of fibre optic cable associated to the engineering network. Implies integrating an extra media converter inside the cabinet and mounting a new set of FO feedthru on the bottom flange of the cabinets.


o In the Azimuth platform, access the network rack via copper UTP, where a dedicated media converter is hosted. Direct patch cable in this rack to the optical network distribution panel. In this case the modifications in the cabinet would be the RJ45 feedthru plus internal UTP patch cable

@CCL-‐FEU-‐Laser-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

1. Verification of the init stop. 2. Preparation of the moco files for PRS control. 3. Turbulence analysis performed on all UTs with the FEU Laser and the Camera Sensor

installed on the CR. The structure function is calculated as the RMS difference in the centroid position between images at different time gaps. The figure reports the structure function in the horizontal and vertical directions for the centroid position as measured from the CR. The correlation time is similar between the different UTs (about 10s), but UT2 and UT3 show about 1/5 of the residuals as respect to UT1 and UT4.

0 5 10 15 20 25 300

0.05

0.1

0.15

0.2

0.25

0.3

Δ x

pos

ition

RM

S (m

m)

Time gap (s)0 5 10 15 20 25 30

0

0.05

0.1

0.15

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0.25

0.3Δ

y p

ositi

on R

MS

(mm

)

Time gap (s)

UT1UT2UT3UT4

Figure 21 – Turbulence analysis performed on all UTs (day time).

4. Analogous calculations are performed for the UT4 during day time (left) and night time

(right). During day time, the residuals are about the double of the night, with a similar correlation time.

0 5 10 15 20 25 300.12

0.17

0.22

0.27

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Δ p

ositi

on R

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(mm

)

Time gap (s)

UT4, orizontalUT4, vertical

0 5 10 15 20 25 30

0.1

0.125

0.15

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MS

(mm

)

Time gap (s)

UT4, orizontalUT4, vertical

Figure 22 – Turbulence analysis performed on UT4 during day time (left) and night time (right)..

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 27/36

3.9 Day 9: 17.02.2016 (Wednesday)

Departure to Antofagasta of Matteo and Giorgio. @CT-‐Cabinets-‐-‐-‐ -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐

1. Teleconf with Igor and Marco. Antonio, Manuel and Denis (later Gaspare) attended in Paranal. Issue: engineering network and the best way to connect CT cabinet PLCs. Although not mandatory in terms of ESO point of view, namely taking into account the advanced stage of acceptance/installation of some of ESPRESSO PLC subsystems, we all agree that a permanent connection to the engineering network would be interesting at a long term and advantageous for us. From the different technical solutions that could be put in place, the accepted solution was the one that is common for all CT cabinets and FE:

o ESO provides an extra pair of Fiber optics cabling connected to the engineering network.

o The adaptation of existing Espresso subsystems, namely of CT cabinets, includes mounting of an extra media converter inside.

o For the CT cabinets there would be some mechanical adaptations to be implemented in each one, including the mechanical mounting of the media converter, FO feedthru on the bottom flange and the production and wrapping inside of 2 patch cables ( 1 fiber pair, one UTP).

The next step would be issuing a CRE from ESO to the consortia to propose this alteration. Only after this, actual implementation would be put in place.

2. Cabinet schematics were placed in all the cabinets, attached to the door. 3. Stowing all CT electronics components and tools. A large box containing Igus piping and

accessories, small tools and components with restricted use of CT electronics, was placed in the CCL.

Figure 23 – Manuel and Antonio near one of the P5P6 cabinets installed in the Azimuth platform.


@LAT-‐in-‐VLTiDelayLine-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. Preparation of material

o Mounting of the LAT optomechanics. o Mounting of LAT on support frame for its alignment in the Delay Line corridor in

VLTi Complex. 2. Alignment of LAT. Figure 24 shows the setup:

a) The laser beam which is reflected by the cube splitter is sent to a corner cube placed at 2m (at this distance, due to the divergence of the beam, it is guaranteed that the diaphragm near the laser alignment with incoming beam removes any lateral misalignment of the corner cube). The error parallelism of the corner cube is 5 arcsec (Newport Model: UBBR1-‐5).

b) The beam transmitted by the beam splitter is then reflected by the adjusting flat mirror. This beam is sent to a translucent paper situated at 6 m. The beam coming from the corner cube is also projected on this screen. However its intensity is much lower than the main spot (from the adjusting flat mirror).

c) A camera to visualize the spots is placed between the LAT and screen. It lies at 1 m from the screen and it is connected to a laptop. The Camera Sensor (also used in CR to visualize FEU laser beam) software allows to measure the spot position with a resolution of 20 µm (limited by noise and beam fluctuation).

3. LAT Alignment Procedure: a) The beam coming from the corner cube and the diaphragm defines the optical axis.

The spot on the screen is then recorded and its centroid is defined as the reference position. For this operation, the bright spot is eliminated by putting a piece of paper between the beam-‐splitter and the mirror.

b) The bright beam is allowed to reach the screen and it is much more intense that the reference spot. The camera is adjusted on the bright spot and its centroid is measured. The spot is then sent to the reference position by adjusting the flat mirror in tip/tilt. The system camera-‐software is able to place the bright spot better than 130 µm in (Figure 25). Therefore the error collinearity of the two beams are, for a 6 m distance, sum squaring with the parallelism error of the corner cube, 0.11 arcmin.

Figure 24 – LAT alignment on the VLTi Delay Line Lab.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 29/36

Figure 25 – Spots on the Camera Sensor for the LAT alignment (left centre reference measured at the end of

the alignment to confirm stability and right the aligned spot after mirror tip tilt blocking).

3.10 Day 10: 18.02.2016 (Thursday)

Departure to ANF of Manuel Abreu and António Oliveira.

@CT-‐Cabinets-‐-‐-‐ -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. Final inspection of the cabinets with Gaspare Lo Curto:

o Note that the cabinets at bodega level in all UT do not have yet live power lines. o All cabinets have the main switch in off position and the internal breaker in off

position. 2. Final stowing away and cleaning of material and components related to CT electronics.

@LAT-‐in-‐UT3-‐NasmythTube-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 3. Mounting of the LAT support (spider) inside the telescope Nasmyth Centre Piece in UT3.

The spider was mounted from the M1 mirror side with the Sequani lift. The operation took a lot of time (around 1 hour) because the difficulty to remove the attachment hookers inside the telescope tube and their replacement by the hookers dedicated for the fixation of the spider. The spider was “shorter” than the hooker level and therefore a simultaneous fixation of both, the spider and hookers was necessary. This second operation was difficult and long.

4. The LAT was then mounted on the spider. The orientation was fixed in such a way that the X, Y movements of the translation stage were as parallel as possible with the orientation of the guide probe (GP). This allows to de-‐couple the X, Y movement of the spot.

5. The LAT includes 2 sets of X, Y movements, one with a large range (~10mm) and a second with a short movement range (~4mm). Both of them were adjusted in such a way that the laser beam was centred on the pupil beacon and on the centre of the GP pick-‐up mirror.


6. To identify the centre of the GP pick up mirror, a black target with a silver-‐white marks and a spot (~1mm) in the centre. This target was provisionally mounted in front of the GP mirror. The GP was sent to the centre of the field.

7. The Adapter/Rotator was turned by 360° to record the movement of the LAT spot on the target. For that, the Camera Sensor imaging system was mounted between the LAT and the GP. The system includes a video camera mounted behind the LAT support and pointing to the GP. A laptop is used to record and analyse the position of the spot on the target

Figure 26 – LAT at Nasmyth tube in the VLT UT3 unit centre piece.

3.11 Day 11: 19.02.2016 (Friday)

@LAT-‐in-‐UT3-‐NasmythTube-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. The identification of centre of rotation of the GP mirror was consistent with the reference

point in the GP CCD (deduced by start observation and rotating the Adapter/Rotator with the GP in the centre of the field). The difference was less than 2 pixel error (220 µm, 110 µm each pixel image).

Figure 27 – Characteristics of the GP sensor from VLT-SPE-ESO-11420-0675.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 31/36

2. Next step: the LAT was fine tuned in X, Y and tip-‐tilt. In order to adjust the position of the laser spot on the pupil beacon, the fibre pupil beacon was extended with an additional fibre of 20 m (200 µm core) to reach the Telescope Centre Piece. The output fibre end was connected to a Thorlabs photodiode (PM100USB -‐ USB Power and Energy Meter) and this connected to a laptop for flux recording. The flux level was of the order of tenth of µW. The spot shape was assumed to be a Gaussian function. The spot size at the level of the pupil beacon was around 20 mm at 2σ. A Gaussian simulation, considering the Pupil Beacon collimator entrance diameter of 2.5 mm, provided the position error of the spot on the pupil beacon. The spot position resolution was estimated to be 2 mm (corresponding to a decrease from the maximum amplitude in the meter of 7.4%), equivalent to 0.5 arcmin.

3. To laterally align the LAT, the position of the rear spot projected on the target on the GP was recorded.

4. The large range X, Y stage position resolution was around 20µm. 5. Alignment Procedure:

a) Due to the large lever arm between the LAT and the pupil beacon, the LAT was first tilted to centre the spot on the pupil beacon and then to laterally translate the laser to put the backwards spot on the GP target

b) The fine threat Newport screws controlling the tip-‐tilt were screwed in order to send the LAT spot on the pupil beacon.

c) All the springs were tighten close to the maximum strength. d) The control of the tilt was done by maximizing the flux on the photodetector. e) The laser spot on the GP target was sent by X, Y translation to the centre of

rotation. f) Correction of the tip-‐tilt to compensate the X, Y movement. g) Residual correction of the X, Y spot position. h) The blockage of the tip-‐tilt screws was done by push-‐pulling the micrometre

screws and the blocking screws simultaneously. i) The X, Y adjustment was repeated using the GP CCD camera (Technical CCD). For

that, the laser beam was attenuated with a couple of polarizers. A third polarizer was necessary to increase the attenuation to avoid camera saturation.

j) The X, Y adjustment is then done by sending the laser spot to the reference point in the GP camera. The difficulty of this method was to compute the barycentre of the spot because frequently the spot was close to the edge of the dichroic mirror or in front of “shadow features” on the surface of the CCD. Anyway, this method would be preferred to the target attached to the GP arm.

k) The position of the reference pixel is defined in the database, in the table: Appl_data:TCS:msw:insData.data columns # 14 and 15, row # 2 The value (as of 19-‐02-‐2016 @ 13:00) is: (x ; y) = (305.9 ; 297.4). It was last updated in November 2013, and re-‐checked on average twice a year since then. The value is updated only if the deviation is large (large TBD).

l) The reached alignment accuracy was less than 0.25 arcmin (at 17° altitude) in tip-‐tilt and for XY (305.1 ; 298.2) approximately 1.13 pixels corresponding to 125 µm on the GP target.


6. In order to evaluate the influence of telescope flexures, the telescope was moved from 17° altitude to 89° and back. The position of the spot on the GP was measured and also the power coming from the pupil beacon (directly to the power meter, without the 20 m fibre). During the alignment the tilt was slightly offset to compensate for the flexure and to optimize the alignment close to 65° (the selected nominal observing altitude). As seen in the following graphics, there is a flexure on the telescope spider that produces a tilt variation on the LAT beam. It is clear a “compensated” behaviour from 17° to 45° and also some hysteresis. As seen, the offset on the alignment optimized the alignment for 50° altitude. Nevertheless it must be noticed that the maximum tilt deviation is below 1 arcmin, well within the success criteria. For the XY position on the GP, the graph (showing in a red cross the centre position), shows also the hysteresis and demonstrates that an offset correction is also required. It must be mentioned that after this tests the telescope was moved from 17° to 89° and back two times more and the both the power and the pixel position had a very good repeatability (almost exact in power and 0.2 of a pixel in beam position).

8.0

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n from

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um in arcmin

Altitude in deg

Figure 28 – Tip tilt variation measured with pupil beacon power during telescope altitude variation. The telescope went from 17° to 89° and back. The large sport corresponds to the first measurement. The

displacement from maximum was calculated considering the decrease in measured power.

290

295

300

285 290 295 300 305

Y pixel

X pixel

17°20°

30°40°

50°60°70°

89°

80°

Figure 29 – XY variation on the GP during telescope altitude variation. The large sport corresponds to the

first measurement. The red cross corresponds to the central pixel.

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3.12 Day 12: 20.02.2016 (Saturday)

@LAT-‐in-‐UT3-‐-‐-‐ -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ 1. Test of flexure of the telescope for high altitude angles

a) The LAT alignment was performed when the telescope was at 17°. Since the average observations are made around 65°, we studied the shift of the spots (pupil beacon and GP camera) as a function of the altitude angle. The movement of the laser spot on the pupil beacon is mainly due to the flexure of the tube supporting M2. The shift of the opposite LAT spot on the GP camera is probably due to an error angle of the altitude angle (were the LAT is mounted) with respect to the Adapter/Rotator axis.

b) In a first test, the spot movements were recorded for a number of altitude angles. Coming back to the telescope initial position, we noticed a small hysteresis behaviour. In a second test, the shifts at 65° were recorded and counter-‐shifts were applied when the telescope was at 17°. When the telescope were sent again at 65°, we noticed that the shifts were not exactly at the optimal position. One way to overcome this problem is to re-‐align the LAT directly at 65°.

c) The following graphs show the detailed results obtained with an alignment offset to perform better at 65°. They show that both the tip tilt and XY position are now better optimized for 65°.

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Figure 30 – Tip tilt variation measured with pupil beacon power during telescope altitude variation.

Optimized alignment for 65°.


294

299

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309

299 304 309

Y pixel

X pixel

17°20°

30°

40°

50°

60°

70°

89° 80°

65°

Figure 31 – XY variation on the GP during telescope altitude variation. Optimized alignment for 65°.

2. Conclusion a) The LAT can be used to define the best “optical” axis for the ulterior alignment of

the optics of the Coudé Train. b) The LAT can be relatively easy to align with respect to the M2 pupil beacon and

with respect to the centre of rotation of the Adapter/Rotator. The accuracy tilt error is less than 0.5 arcmin (< 2mm on the pupil beacon). The lateral error is less than 0.2mm for 65° altitude (< 2 pixels in the GP). For the maximum altitude amplitude, as shown in the following graphics, the XY decentre in within ±1.4 mm, which is totally acceptable (the requirement on the alignment for 65° altitude was ±1 mm).

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Figure 32 – XY distance from central pixel as a function of altitude angle.

VLT-‐MIN-‐ESP-‐13520-‐, Issue 1.0 35/36

3. Test the x-‐y sensitivity to tip-‐tilt alignment: a) Starting (x ; y) = (311.7 ; 308.5) b) Release the spring of the upper adjustment of the tip-‐tilt by one complete rotation

(x ; y) = (310.9 ; 309.4) => variation of X = -‐1.8 pix and Y = +0.9 pix. c) Screw the upper adjustment by one complete turn:

laser light out of beacon by approximately 5 cm (around 10 arcmin) (x ; y) = (247 ; 328) => variation of X = -‐65 pix and Y = +20 pix.

4. Summary of the hours worked in UT3:

17-‐02 2h 18-‐02 4 h 19-‐02 6.5h 20-‐02 5h

5. Having to start from scratch, on a next mission, unless there are troubles, we estimate that it will be needed 6 hours to materialize the ALT axis => a full day. Any realignment can be done in less than 1 hour (considering that tiptilt is not so difficult to obtain, is not so sensitive and should be maintained, and we only need to correct XY).

3.13 Day 13: 21.02.2016 (Sunday)

1. Packing and leaving the Paranal observatory.


Chapter 4. Postponed tasks and AI The following tasks/AI have to be done before the June mission (unless other date is specified).

1. Only one bundle was produced due to later arrival of purchased fibres. One will be tested and assembled and the others will be integrated in next mission. AI-‐01(02-‐2016) on Gerardo Ávila to produce 4 bundles according to instructions described in this report.

2. The support of the alignment source fibre bundle needs to be redesign to allow an easy attachment to the telescope in the P5 area. AI-‐02(02-‐2016) on Alexandre Cabral to provide the drawings of the new support. Due date 15-‐03-‐2016

3. On UT2 it will be necessary to fix the wooden floor on the Inner Track to the I Beam structure near the CT optical path marked with tape. AI-‐03(02-‐2016) on Gaspare Lo Curto to request Herman Barrios to perform this task.

4. On the CT Cabinets it is still necessary that ESO completes the following two tasks: Cabinets in P5/P6 and P7 locations in all UTs do not have yet comm connections; All P7 locations in all UTs do not have yet a live power connections. AI-‐04(02-‐2016) on Gaspare Lo Curto to request ESO Paranal to perform this task.

5. The alignment source fibre needs to have extra means to reduce power by optical/mechanical means below the electrical threshold levels. AI-‐05(02-‐2016) on Gerardo Ávila to evaluate the adequate level of attenuation and the type of attenuator to be mounted inside the cabinets.

6. For the alignment of the LAT on the VLTi delay line it will be necessary to have a longer post (more than 50 mm, ideally 80 mm). AI-‐06(02-‐2016) on Alexandre Cabral to bring the post to Paranal.