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advanced
Advanced Virgo BASELINE DESIGN
advanced
Giovanni Losurdo – INFN Firenze
Advanced Virgo Coordinator
for the Virgo Collaboration
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 2
advanced ADVANCED VIRGO (AdV)
Upgrade of Virgo+, “minor” modifications to the facilities and to the SA
Sensitivity goal: about 10x better than Virgo
Main foreseen changes:
– higher power (optical readout noise)
– heavier mirrors (optical readout noise)
– better coatings (thermal noise)
– signal recycling (shape the curve)
– beam waist position (thermal noise)
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 3
advanced ONGOING AdV R&D – SUMMARY (I)
Fiber laser and IMC
Optics forhigh power
Detection system
Mirror coating Mirror cleaning
Optical config. design(Post‐doc@B’ham)
Prototyping/locking(CALVA)New modal optics
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 4
advanced ONGOING AdV R&D – SUMMARY (II)
Tiltmeter
Marionette RMCleanliness
Ribbons formonolithic susp.
(Glasgow)
Electrostatic act.
IP upgrade
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 5
advanced STATUS
AdV conceptual design completed
– Internal review in progress
– Due to STAC (advisory panel) and EGO Council (funding agencies) by the end of the month
Waiting for the funding agencies approval
– New organization being setup. From Working Groups to WBS.
– Next two years to prepare the AdV technical design.
advanced
AdV BASELINE
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 7
advanced LASER
BASELINE:
200 W SOLID STATE LASER AMPLIFIER (LZH for Advanced LIGO)Nice Group is already collaborating with LZH for the Virgo+ amplifier.
ALTERNATIVE OPTION:
FIBER LASER AMPLIFIER (R&D Nice‐Limoges): promising research line
– stabilization to be done
– non linear effects and polarisation maintaining to be investigated at HP
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 8
advanced INPUT OPTICS
BASELINE:
144 m SUSPENDED RESONANT IMC: Virgo‐like solution. Problem of small
angle diffused light to be addressed.
EOM – FARADAY: Advanced LIGO solution.
AdvLIGO EOM
AdvLIGO Faraday
ALTERNATIVE OPTION:
FIBER LASER IMC (R&D Nice‐
Limoges): promising research line,
would be a major simplification.
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 9
advanced SIGNAL RECYCLING
BASELINE:
“WIDEBAND” SR – Optical parameters to be defined.
The base for the SR tower is there!
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 10
advanced OPTICAL LAYOUT ‐ DETECTION
seetalk
byA.F
reise
OPT. LAYOUT BASELINE:
TEM00
WAIST IN THE CAVITY CENTER
LARGER BEAM: requires changing
the vacuum links in the central area.
DET. BASELINE:
PHOTODIODES IN VACUUM
DC DETECTION
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 11
advanced MIRRORS
ALTERNATIVE OPTION:
EVEN HEAVIER TEST MASSES (60 Kg?)
Useful if fiber geometry is optimized
BASELINE:
35 cm diam. 20 cm thick, 42 Kg
SUBSTRATES
STATE OF ART COATINGS
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 12
advanced SUPERATTENUATOR ‐ IP
BASELINE:
VIRGO DESIGN with STIFFER IP LEGS
TILTMETER AND IP 6 DOF CONTROL
MECHANICS: NEW MARIONETTE REFERENCE MASS
MIRROR ACTUATION: COIL‐MAGNET PAIRS
ALTERNATIVE OPTION:
ELECTROSTATIC ACTUATORS: noise specs to be
demonstrated
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 13
advanced SUSPENSIONS
BASELINE:
FUSED SILICA CYLINDRICAL FIBERS
ALTERNATIVE OPTION:
FUSED SILICA RIBBONS
DUMBBELL FIBERS
Virgo+ studies: The dummy mirrorsuspended withsilica fibers
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 14
advanced AdV BASELINE ‐ SUMMARY
heavier mirrors(42 kg)
high finesse (≈1000)
larger beam waist
DC detection
signal recycling
new IPtilt control
new payload
fused silicasuspensions
high power SSL(200 W)
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 15
advanced SENSITIVITY CURVE ‐ preliminary
BNS range: 121 Mpc
BBH range: 856 Mpc
1 kHz sens.: 6 10‐24
SR mirror transmittance: 0.04
Input mirror transm: 0.007
Finesse: 885
PR factor: 23.5
Power on BS: 2.9 kW
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 16
advanced BNS/BBH inspiral range vs tIN‐tSR
128‐717
127‐758
125‐805
121‐859
111‐912
0.007
124‐782127‐743128‐678128‐584115‐4290.1
122‐818125‐783128‐718129‐620118‐4720.08
118‐857123‐829126‐764130‐659120‐4700.06
112‐898118‐880123‐817129‐699122‐4700.04
101‐925108‐925114‐871122‐729121‐4140.02
0.010.0080.0060.0040.002tSR tIN
Lower FP cavity finesseLower
SR m
irrortransm
ittance
BLUE = BNS inspiral rangeRED = BBH inspiral range
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 17
advanced AdV sensitivity vs Fiber geometry
959859BBH
126121BNS
2.9 kWPBS
23.5G
885Finesse
ribboncylindricalfiber
geometry
The ribbon choice reduces considerably the contribution of
suspensions thermal noise
Dumbbell fibers can also improve the performance
The benefits on the sensitivity are limited by radiation pressure,
newtonian and CONTROL NOISE (unmodelled so far)
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 18
advanced HEAVIER MIRRORS?
If ribbons are used, low frequency sensitivity can be further improved
by using thicker mirrors (30 cm diam., 63 kg mass)
The low frequency sensitivity is then limited by newtonian noise
(model uncertain) and coating brownian noise
1053859BBH
130121BNS
2.9 kWPBS
23.5G
885Finesse
ribbon63 Kg mirr
BASELINEfiber
geometry
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 19
advanced TWO‐STEP STRATEGY?
We are considering the idea of a two‐step strategy:
– Start AdV WITHOUT SR mirror and learn to operate the power recycledinterferometer with high power
– Add the SR mirror afterwards
A good “intermediate” sensitivity can be achieved, even better with
heavier mirrors
Power rec AdV
BNS range: 97 MpcBBH range: 265 Mpc1 kHz sens.: 2 10‐23
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 20
advanced CONCLUSION
A baseline design for AdV has been proposed
Possible changes to the baseline will be considered (on the strength
of the R&D progress) and discussed next year within a new AdV
organization
See next talk by A.Freise and P.Puppo for more details
ILIAS Annual Meeting – Tubingen, Oct 9, 2007 G.Losurdo – INFN Firenze 21
advanced INVITATION
AdV is moving towards a new phase: the preparation of the
TECHNICAL DESIGN
There are many things to do and we are open to enlarge the
Collaboration for Advanced Virgo