advanced virgo giovanni losurdo advanced virgo coordinator for the virgo collaboration

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Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

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Page 1: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

Advanced Virgo

Giovanni Losurdo

Advanced Virgo Coordinator

for the Virgo Collaboration

Page 2: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 2

ADVANCED VIRGO (AdV)

PROJECT GOALS Upgrade Virgo to a 2nd generation detector. Sensitivity: 10x better than Virgo Be part of the 2nd generation GW detectors network. Timeline: in data taking

with Advanced LIGO

Page 3: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 3

MAIN REQUIRED UPGRADES

Signal Recycling (SR)

Non degenerate rec. cavities

200W laser

Higher finesse3km FP cavities

Heavier mirrors

Waist in the cavity center

Larger central linksCryotraps

Monolithicsuspensions

Page 4: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 4

TUNEABILITY

AdV can be “tuned”. Changing the SR mirror transmittance allows to shape the sensitivity curve

The tuneability can be exploited to optimize the detector for different astrophysical sources (BNS, BBH, millisecond pulsars,supernovae)

Page 5: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 5

STEPS TOWARDS TARGET

The design sensitivity will be achieved in “steps”:

− The commissioning activity will start in “low power” configuration

− The opportunity of starting without SR will be considered

Even with low input power and without SR AdV can have a relevant science impact

BNS (Mpc)

BBH (Mpc)

h@1 kHz

AdV REF 149 753 1.8e-23

5 W in 117 1374 1.8e-21

30 W in 139 1004 1.6e-22

no SR 107 311 2.2e-23

Page 6: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

DESIGN OVERVIEW

See “Advanced Virgo Preliminary Design”, VIR-089A-08

Page 7: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 7

OPTICAL CONFIGURATION

MAIN FEATURES Signal recycling Non degenerate recycling cavities Larger spot on the mirrors

Page 8: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 8

OPTICAL CONFIGURATION - SR

SIGNAL RECYCLING WHY?: Allows shaping of the detector sensitivity Requires one more SA (tower base available) Adds complexity, commissioning more difficult

Page 9: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 9

OPTICAL CONFIGURATION -NDRC

NON DEGENERATE RECYCLING CAVITY WHY?: Avoid high order modes to be resonant

− much “cleaner” ITF dynamics

− reduces sensitivity to misalignments, thermal effects, ROC errors

− provides more control signals

Requires:− larger vacuum links

− extra seismic isolation for injection and detection benches

Promises to simplify commissioning

Page 10: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 10

OPTICAL CONFIGURATION – SPOT SIZE

LARGER SPOT SIZE WHY?: Reduces mirror thermal noise

and thermal effects on input mirrors Requires larger vacuum links and

larger beam splitter

effB

coat fY

Tdk

rfh

20

41)(

Page 11: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 11

PRE-STABILIZED LASER

AdV laser to provide up to 200 W High power stage bases on the LZH design for the Adv LIGO laser Pre-stabilized in frequency and amplitude

Page 12: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 12

INJECTION SYSTEM

Input mode cleaner: 144 m suspended triangular cavity Large Faraday isolator with thermal compensation (DKDP crystal) Non degenerate PR cavity: the matching telescope is moved inside the cavity.

The PRM and the folding mirror must be suspended on the injection bench

Page 13: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 13

MIRRORS

HEAVIER TEST MASSES WHY? Cope with larger radiation pressure Require payload modification and silica fibers

optimization Reference design:

− 35 cm Ø, 20 cm thick, 42 Kg FP mirrors

− Flatness requirements: 0.5 nm

− Larger BS

− 2010 state of the art coating

Corrective coating might allow to further improve the flatness and give more flexibility

63 kg mirrors considered

− technically feasible, though payload modifications more risky

− science gain limited by newtonian/susp thermal noises

Page 14: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 14

MIRRORS - FEATURES

All the choices needed to purchase the large test masses have been made. Some features of the small mirrors of the REC cavities TBD/TBC

TBD# 10 ppm

(TBC)# 10 ppm

(TBC)# 100 %50 %

# 10 ppm(TBC)

0.7 % (TBC)

TransmissionReflective side

3 nm RMS (TBC)

20 mm

3 nm RMS (TBC)

20 mm

3 nm RMS (TBC)

100 mm

3 nm RMS (TBC)

150 mm

3 nm RMS (TBC)

250 mm

0.5 nm RMS (TBC) 200 mm

0.5 nm RMS (TBC)

150 mm

RMS Flatness Reflective side

<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMSRoughness

Reflective side

50 mm50 mm50 mm100 mm (TBC)

65 mm200 mm 200 mmThickness

50 mm(TBC)

50 mm(TBC)

150 mm (TBC)

280 mm(TBC)

< 550 mm(TBC)

350 mm350 mmDiameter

Herasil 102Herasil 102Herasil 102Herasil 102Suprasil

3001Suprasil 312

Suprasil3002

Fused Silica Nature

3332244Number of

parts

PRM1/SRM1PRM2/SRM2PRM3/SRM3

Non degenerate Power and Signal recycling Cavities

Compensation PlateCP

Beam SplitterBS

End Mirror EM

Input MirrorIM

TBD# 10 ppm

(TBC)# 10 ppm

(TBC)# 100 %50 %

# 10 ppm(TBC)

0.7 % (TBC)

TransmissionReflective side

3 nm RMS (TBC)

20 mm

3 nm RMS (TBC)

20 mm

3 nm RMS (TBC)

100 mm

3 nm RMS (TBC)

150 mm

3 nm RMS (TBC)

250 mm

0.5 nm RMS (TBC) 200 mm

0.5 nm RMS (TBC)

150 mm

RMS Flatness Reflective side

<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMS<1 Å RMSRoughness

Reflective side

50 mm50 mm50 mm100 mm (TBC)

65 mm200 mm 200 mmThickness

50 mm(TBC)

50 mm(TBC)

150 mm (TBC)

280 mm(TBC)

< 550 mm(TBC)

350 mm350 mmDiameter

Herasil 102Herasil 102Herasil 102Herasil 102Suprasil

3001Suprasil 312

Suprasil3002

Fused Silica Nature

3332244Number of

parts

PRM1/SRM1PRM2/SRM2PRM3/SRM3

Non degenerate Power and Signal recycling Cavities

Compensation PlateCP

Beam SplitterBS

End Mirror EM

Input MirrorIM

Page 15: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 15

MIRRORS - PRODUCTION PLAN

Detailed revised DRAFT Planning if starting on 01/07/2009: estimation based on real delay for the manufacturing of the silica and on the real time necessary for the VIRGO+ substrates polishing

Overall estimated time: 2 yrs + 9 mts

Page 16: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 16

THERMAL COMPENSATION

WHY? Compensate for wavefront distorsion and test mass surface deformation

Reference design:

− Ring heater around test masses to correct for ROC

− CO2 laser to correct for wavefront distorsion on recycling cavities

− “Compensation plates” needed in front of input test masses

Compensation plates to be suspended from SA

Page 17: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 17

DETECTION

DC READOUT WHY? To reduce shot noise by ~20% and the influence

of some technical noises Requires a new high finesse output mode cleaner

SUSPENDED DETECTION BENCH Must host the SR mirror and the folding mirror (with their suspensions) Must host the main photodiodes that need to be under vacuum

Page 18: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 18

SENSING AND CONTROL

Reference design:

− Auxiliary laser to lock the high finesse cavities

− Extended Variable Finesse technique for full lock

− Requirements, a set of cavity lengths and mod. frequencies defined

− Linear control scheme defined

The reference control strategy requires to move all the long towers in the central building

Page 19: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 19

SUPERATTENUATOR

Vibration isolation provided by the SA is compliant with AdV sensitivity

Main foreseen change: tilt control of the inverted pendulum (inertial platform controlled in 6 d.o.f.)

Tilt control allows to cope with wind generated tilt noise, that can spoil the inertial damping performance with bad weather conditions

Tilt actuation already foreseen in the inverted pendulum design (room for PZT at the base of the legs)

Page 20: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 20

PAYLOAD

The heavier mirror requires to modify the payload Constraints:

− keep the payload weight the same as Virgo’s

− low electrical conductivity reference mass

A simplification of the “steering” part is being investigated (MRM)

Page 21: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 21

MONOLITHIC SUSPENSIONS

Virgo+ fibers

Engineering of Virgo+ fibers well advanced:

− standardized production and reproducible geometry

− welding and clamping optimized

− flexure points controlled

AdV monolithic suspensions

− fiber geometry optimization: use of tapered fibers?

Page 22: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 22

VACUUM – RESIDUAL PRESSURE

VIRGO RESIDUAL PRESSURE:

10-7 mbar (H2O+H2+HC), 100 worse than LIGO (bake-out)

Residual pressure noise would spoil AdV sensitivity: bake-out needed Need to separate tubes from towers

REFERENCE SOLUTION: CRYOTRAPS WHY? Allow to bakeout the pipes and

not the towers Major upgrade of the vacuum system

Page 23: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 23

VACUUM – CENTRAL LINKS

NEW VACUUM LINKS IN THE CENTRAL AREA WHY?: lenghts to be changed, diameter to be increased

− the position of the towers will be changed by up to 1 m (ISC requirements)

− larger beam spot on the input test masses, folded beam path in non-degenerate recycling cavities, require larger diameter links

Page 24: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 24

VACUUM - INFRASTRUCTURES

STRUCTURES INVOLVED IN HEAVY MODIFICATION WORKS

vacuum links

scaffoldings braces

cable trays

clean air ducts of the towers

H beams as links between the frames of the ovens

false ceiling of the CR Towers Gallery

DISPLACEMENT OF THE TOWERS IN THE CENTRAL HALL TO OPTIMIZE THE ITF CONTROL STRATEGY

Page 25: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 25

INFRASTRUCTURES

Virgo sensitivity is spoiled by machine noise. Hard commissioning/detector work has been done to understand and reduce the couplings

AdV will be 10x as sensitive noise reduction required AdV approach: improve the machines isolation and move them far from the

experimental halls

Page 26: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

ORGANIZATION

Page 27: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 27

AdV STEPS

PHASE 1: AdV Conceptual Design (ended fall 07) PHASE 2: AdV Final Design (to end June 09) PHASE 3: AdV Construction PHASE 4: AdV Installation PHASE 5: AdV Commissioning

Page 28: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 28

PHASE 2 ORGANIZATION

OSD – A.Freise

AdV coordinator – G.Losurdo

DAQ – R.De Rosa

VAC – A.PAsqualetti IME – A.Paoli

Task Manager

Task Manager

PAY – P.Rapagnani

SAT – R.PassaquietiTCS – V.Fafone

MIR – L.PinardDET – E.Tournefier

INJ – E.GeninLAS – N.Man

ISC – F.Bondu

VSCVirgo spokesman/EGO scientific dir.

EGO

Page 29: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 29

Advanced Virgo Coordinator

From the Virgo Organization Document

The AdV coordinator coordinates the preparation for AdV. More specifically he is responsible of:

− Coordinating the activity of the AdV System Managers (SM)

− Coordinating the R&D activity for AdV.

− Coordinating the elaboration of the final design.

− Making sure that system design issues are worked out.

His goal is to reach a state where the AdV systems are ready for construction (mandate to end in Spring 09)

Page 30: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 30

Subsystem Managers

OSD (Optical Simulation and Design) A. Freise (B’ham Univ.)

ISC (Interf. Sensing and Control) F.Bondu (OCA Nice)

LAS (Laser) N. Man (OCA Nice)

INJ (Injection system) E. Genin (EGO)

DET (Detection system) E. Tournefier (LAPP Annecy)

MIR (Mirrors) L. Pinard (LMA Lyon)

TCS (Thermal Comp. System) V. Fafone (INFN Rome 2)

SAT (Superattenuators) R. Passaquieti (INFN Pisa)

PAY (Payload) P. Rapagnani (INFN Rome)

DAQ (Data Acq. and Electronics) R. De Rosa (INFN Naples)

VAC (Vacuum) A. Pasqualetti (EGO)

IME (Infrastructures) A. Paoli (EGO)

The SM are responsible, within their subsystem, for:

− preparing the list of tasks, milestones and deliverables

− producing precise requirements/specifications;

− preparing the case for the selection of the open design options, including detailed planning and financial resources required;

− preparing a design and project execution plan, to be integrated in the updated AdV documents, and work out the task breakdown.

Page 31: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 31

NEXT STEPS

If project approved and funded:

Start Phase 3 placing the order for the mirrors on July 2009

GOALS FOR MAY 09 (NEXT PROJECT REVIEW)

1. Release of the AdV final design

2. Updated cost plan and project execution plan

Page 32: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 32

AdV COST

In fall 2007 the AdV cost was estimated in the “AdV PEP” (VIR-043A-07)

15.8 MEuro (equipment only)

Since then:

− New organization, subsystem managers in charge

− Relevant changes to the conceptual design

Some of the new design choices may have an important impact on the overall cost (non-degenerate cavities, anthropogenic noise reduction, need for bakeout, …)

Each SM is working to provide an accurate cost plan in the next months (some already have one). The AdV cost plan and spending profile will be presented before the spring review.

Page 33: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 33

AdL: 2nd ITF accepted

DRAFT PLANNING

08 09 10 11 12 13 14 15 1607

PHASE 1: AdV conceptual design

PHASE 2: AdV final design

PHASE 3: AdV construction

PHASE 4: AdV installation

Commissioning

AdL: 1st ITF accepted

AdL: 3rd ITF accepted

×

place mirrors order

Page 34: Advanced Virgo Giovanni Losurdo Advanced Virgo Coordinator for the Virgo Collaboration

AdV 1st Project Review – Cascina, Nov. 3rd, 2008 G.Losurdo – AdV Coordinator 34

CONCLUSIVE REMARKS

A preliminary design of AdV has been released

The forthcoming talks by the subsystem managers will detail the status of the design and show the important progress achieved in the next months

The Virgo Collaboration will release the AdV final design and the updated cost plan before the spring 09 review

GOAL: being in the position to start the construction of AdV on July 1st 2009