IRTF POETS (Orange)Preship review

IRTF POETS (Orange)Preship review

Anticipated shipment date 22 APR 2008

Anticipated mounting 30 APR – 05 MAY 2008

18 April 2008, aasg

Anticipated shipment date 22 APR 2008

Anticipated mounting 30 APR – 05 MAY 2008

18 April 2008, aasg

OutlineOutline

• Overview of POETS IRTF Project

• Lab testing results

• Packing plan

• Shipping Plan

• Mounting Plan

POETS IRTF teamPOETS IRTF team

MIT, Boston• Amanda Gulbis (P.I.)• Jim Elliot (Co-I.)• Folkers Rojas (mechanical design and fabrication)• Mike Person & Matt Lockhart (instrument consultation &

observers)

MIT, Boston• Amanda Gulbis (P.I.)• Jim Elliot (Co-I.)• Folkers Rojas (mechanical design and fabrication)• Mike Person & Matt Lockhart (instrument consultation &

observers)IfA, Hawaii

• Bobby Bus (observing and long term support)• John Rayner (optical design, SpeX interface)• Vern Stahlberger (mechanical design)• Lars Bergknut (mounting & work at summit)• Alan Tokunaga (IRTF division chief)

POETS IRTF SummaryPOETS IRTF Summary

• Our goal is to mount a high-speed, visible wavelength camera system on the IRTF (NASA’s 3-m Infrared Telescope Facility)

• The instrument is based on existing MIT-Williams College POETS (Portable Occultation, Eclipse, and Transit Systems)

• The instrument will be mounted on the side-facing exit window of SpeX – a dichroic allows entry for light < 8000 Å or 9500 Å

• Our goal is to mount a high-speed, visible wavelength camera system on the IRTF (NASA’s 3-m Infrared Telescope Facility)

• The instrument is based on existing MIT-Williams College POETS (Portable Occultation, Eclipse, and Transit Systems)

• The instrument will be mounted on the side-facing exit window of SpeX – a dichroic allows entry for light < 8000 Å or 9500 Å

• Fore-optics box uses 3:1 reducing optics to return f/9.32 beam and 60” FOV

POETS IRTF OverviewPOETS IRTF Overview

• Schematic of full setup• Schematic of full setup

POETS IRTF OverviewPOETS IRTF Overview

• Schematic of full setup

• Optical path

• Schematic of full setup

• Optical path

POETS IRTF ComponentsPOETS IRTF Components

• Fore-optics box (28 pieces, 1 mirror, 3 lenses, 1 filter wheel, 1 filter wheel motor, and assorted dowel pins and screws)

• Camera (Andor Ixon, 512 x 512 frame transfer BI E2V CCD with 16 m pixels; including power cable & computer cable)

• Computer (Shuttle; including power cord, PCI card, keyboard, & mouse)

• GPS (Spectrum Inst.; including power supply, 25-m cable, control cable, and antenna)

• Fore-optics box (28 pieces, 1 mirror, 3 lenses, 1 filter wheel, 1 filter wheel motor, and assorted dowel pins and screws)

• Camera (Andor Ixon, 512 x 512 frame transfer BI E2V CCD with 16 m pixels; including power cable & computer cable)

• Computer (Shuttle; including power cord, PCI card, keyboard, & mouse)

• GPS (Spectrum Inst.; including power supply, 25-m cable, control cable, and antenna)

• Fore-optics box• Fore-optics box

• Camera• Camera

• Computer• Computer

Two computers are shown here -- the top is a current POETS machine. The bottom is the IRTF machine, which we have yet to get functioning properly with the camera. We have ordered a new computer, as similar to the top machine as we possible. If that machine does not work, we will ship a current POETS computer and swap at a later date.

Two computers are shown here -- the top is a current POETS machine. The bottom is the IRTF machine, which we have yet to get functioning properly with the camera. We have ordered a new computer, as similar to the top machine as we possible. If that machine does not work, we will ship a current POETS computer and swap at a later date.

• GPS• GPS

Lab TestingLab Testing

• Setup:• All components assemble and disassemble as planned• Dowel pins are used for accurate alignment during assembly• No play in components once assembled• Light tightness can’t be tested until mounted – all components overlap

• Remaining issues:• attachment to SpeX (was tested onsite)• Manual shutter (functions, but attachment not tested)• Instrument Computer (original system won’t work with the camera. new system

ordered, ETA at MIT 18 April 2008)• Filter wheel (parts are in place, no filters or driving mechanism)• Replacement lenses (lens 1 chipped at edges during initial fitting - doesn’t seem to

effect images, but spare lenses have been ordered)

• Setup:• All components assemble and disassemble as planned• Dowel pins are used for accurate alignment during assembly• No play in components once assembled• Light tightness can’t be tested until mounted – all components overlap

• Remaining issues:• attachment to SpeX (was tested onsite)• Manual shutter (functions, but attachment not tested)• Instrument Computer (original system won’t work with the camera. new system

ordered, ETA at MIT 18 April 2008)• Filter wheel (parts are in place, no filters or driving mechanism)• Replacement lenses (lens 1 chipped at edges during initial fitting - doesn’t seem to

effect images, but spare lenses have been ordered)

Lab TestingLab Testing

• Calibrations• Cooling: TE cooler run for hours at -70º C at room temp• Read Noise and Gain

• Were measured in lab prior to fore-optics box setup, are consistent with spec. sheet• Difficulties in obtaining accurate flatfields while camera is attached to fore optics

Lab TestingLab Testing

Lab TestingLab Testing

• Vignetting• Illuminated frames show slight vignetting at corners• Vignetting pattern changes with adjustment of lens 2 & 3 positions, but cannot be eliminated

• As evenly illuminated as possible: note vignetting (spots are dust on lenses)

• As evenly illuminated as possible: note vignetting (spots are dust on lenses)

Lab TestingLab Testing

Lab TestingLab Testing

• Images• Test charts placed at approximate TFP (0.3” in front of lens 1) can be made to come into a clear focus

• Camera can be adjusted greater than 1” in z-extension for focusing adjustment – threaded at 32 threads per inch to allow fine tuning • No distortions are apparent across the image, centering looks OK – can’t confirm without higher accuracy of TFP

Test charts placed at TFP Images Test charts placed at TFP Images

Lab TestingLab Testing

Packing PlanPacking Plan

• F. Rojas to be in charge of packing fore-optics box• Preassembled, with lens mounts removed• shipped in hard, ex-PCCD container• All associated box hardware and camera cables can fit in this package

• Packages to ship • Fore-optics box• GPS (packaged as shipped to us)• Computer (packaged as shipped to us)• Some possibility for consolidation (i.e. GPS may fit in fore-optics box)

• F. Rojas to be in charge of packing fore-optics box• Preassembled, with lens mounts removed• shipped in hard, ex-PCCD container• All associated box hardware and camera cables can fit in this package

• Packages to ship • Fore-optics box• GPS (packaged as shipped to us)• Computer (packaged as shipped to us)• Some possibility for consolidation (i.e. GPS may fit in fore-optics box)

Shipping PlanShipping Plan

• Online quote for DHL 2-day shipping from zip codes 02139 to 96720 is ~ $500 (100 lb. box with rough dimensions of our fore optics box)

• Plan to ship no later than 23 April (Wed.) for mounting one week later (30 April)• If computer testing takes longer, can ship as late as the 25th

• Hand-carried components• Camera• Optics

• Online quote for DHL 2-day shipping from zip codes 02139 to 96720 is ~ $500 (100 lb. box with rough dimensions of our fore optics box)

• Plan to ship no later than 23 April (Wed.) for mounting one week later (30 April)• If computer testing takes longer, can ship as late as the 25th

• Hand-carried components• Camera• Optics

B. Bus (observing, long term support), J. Rayner (SpeX interfacing, testing), L. Bergknut (mounting, summit work), A. Tokunaga (big problems)

Mounting PlanMounting Plan

Engineering Run Preparation

Engineering Run Preparation

• Submitted plan to A. Tokunaga• Verified plan is reasonable with B. Bus• Completed ORF - requested lodging at PH and IRTF

vehicle• Faxed Driver’s Clearance form• Contacted George Koenig re: instrument delivery

• Confirmed DHL 2-day shipping will work• Confirmed shipping address

• Working on night plans for observations with C. Zuluaga

• Submitted plan to A. Tokunaga• Verified plan is reasonable with B. Bus• Completed ORF - requested lodging at PH and IRTF

vehicle• Faxed Driver’s Clearance form• Contacted George Koenig re: instrument delivery

• Confirmed DHL 2-day shipping will work• Confirmed shipping address

• Working on night plans for observations with C. Zuluaga

Engineering Run Preparation

Engineering Run Preparation

Immediate to do• Telecon with Hawaii to ensure we’re all on the same page• Contact Miranda Hawarden-Ogata re: network interface• Confirm engineering observing times

Longer term to do• Compile documentation

• Engineering diagrams• Setup and usage manual

Basic version for observers and more advanced for supporters• Maintenance manual

Immediate to do• Telecon with Hawaii to ensure we’re all on the same page• Contact Miranda Hawarden-Ogata re: network interface• Confirm engineering observing times

Longer term to do• Compile documentation

• Engineering diagrams• Setup and usage manual

Basic version for observers and more advanced for supporters• Maintenance manual

The EndThe End

Slides on possible observing targets to follow

Slides on possible observing targets to follow

POETS IRTF Engineering ObservationsPOETS IRTF Engineering Observations

• Calibrations• On-telescope biases• On-telescope flats (sky and dome)

• Focus • standard star target?• ensure co-focal with SpeX

• Image variations due to pointing • Check variations with telescope pointing• Check variations at different airmass

• Calibrations• On-telescope biases• On-telescope flats (sky and dome)

• Focus • standard star target?• ensure co-focal with SpeX

• Image variations due to pointing • Check variations with telescope pointing• Check variations at different airmass

• Throughput & exp. times• standard star target grid – range of stars from

~ 8 to 20 mag., B & R stars, versus range of exposure times in conv.and EM modes

• Throughput & exp. times• standard star target grid – range of stars from

~ 8 to 20 mag., B & R stars, versus range of exposure times in conv.and EM modes

Engineering Observations IIEngineering Observations II

• Possible science targets • KBO and star for 06 May 2008 appulse• Other KBOs• Occultation candidate stars

• Possible science targets • KBO and star for 06 May 2008 appulse• Other KBOs• Occultation candidate stars