Transcript Advanced VIRGO

VIRGO
Second part
Advanced VIRGO
and
the INFN VIRGO activity in 2010
Fulvio Ricci
29.09.2009
OPENING A NEW ASTRONOMICAL WINDOW
2nd
generation detectors:
Enhanced LIGO/Virgo+
2009
Virgo/LIGO
Advanced Virgo, Advanced LIGO
108 ly
GOAL:
sensitivity 10x better 
look 10x further 
Detection rate 1000x larger
Intermediate step:
Virgo+, Enhanced LIGO, GEO HF
Adv. Virgo/Adv. LIGO
2014
Credit: R.Powell, B.Berger
ACHIEVABLE SENSITIVITY
NS-NS detectable as far as 300 Mpc
BH-BH detectable at cosmological distances
10s to 100s of events/year expected!
Ad Virgo in a nutshell
Large cryotraps
Larger central vacuum links
heavier mirrors
(42 kg)
high finesse
(≈1000)
new IP
tilt control
larger beam waist
signal recycling
new payload
high power SSL
(200 W)
DC detection
fused silica
suspensions
MAIN PROJECT MILESTONES
 Oct 09:
AdV project start
 Jun 10:
Release of the Technical Design Report
 Jul 11:
Virgo+ shutdown / start AdV installation
 Mar 14:
End of Sub-Sytem pre-commissioning and first light injection in the arms
 Dec 14:
AdV project end: first 1 hour lock
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MIRRORS
First important orders ready
• Robot: reviewed and approved
• Technical Readiness Review of mirror substrates under way.
• Substrates:
– Offer received
– Order to be placed after the formal approval (Oct 6)
•
Polishing to start in the second half of 2010
7
Vacuum
after the mirror production the vacuum system is on
the critical path of the project
First cryo-trap ready in factory (proto)
Nov ’10
Comment: first trap will be fully tested in factory.
The production of the remaining three will follow
Towers displaced in new positions
Feb ’12
Comment: it shall be done early after the stop,
constraining all the other activities in the central hall
Enlarged links installed
May ’12
Comment: central vacuum chamber completed
Control system installation start
Jun ’12
The 4 traps installed
Nov
’12
Comment: traps in vacuum at 77K, both tube arms available
How we will use the budget for the Adv VIRGO
construction: 2009 ORDERS
AdV expenses for 2009
11/09/2009
(Prices are estimates from the AdV planning)
Foreseen expenditures:
≈2.8 ME
PS - Subject to formal approval
of the project by the Council…
MIR
Robot for the corrective coating - Design study MIR.03.11-d purchase first elements
MIR.03.12-d Robot for the corrective coating -Mechanics
MIR.02-d
Mirror substrates
Total
MIR.05.01-d
MIR.06.02-d
MIR.06.04-d
MIR.05.03-d
MIR.06.01-d
MIR.05.07-d
1- Cleaning machine
2- Absorption bench modification
3- New bench for flatness measurement
4- Mirror handling tools
5- Metrology mounts
6- Ion source for Q factor measurement
Total
SAT
SAT.06.04-d SR safety frame
SAT.06.05-d SR tower filters
Total
Global total
with tax
100 kE
150 kE
1 570 kE
1 820 kE
110 kE
30 kE
120 kE
20 kE
30 kE
150 kE
460 kE
14 kE
70 kE
84 kE
2 364 kE
2837
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CRUCIAL POINTS STILL OPEN
 After formal approval: put baseline and related documents under
configuration control
– Configuration control board not yet in place
 Optical design finalization
 Impact of Non Degenerate Recycling Cavity on Payload structure
(suspension for multi-mirrors)
 TCS finalization (compensation plate ) and impact on the input
mirror payloads
 Assessment of fiber laser progress (review in October or early
November)
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Cryotraps and noise study: the present VIRGO lesson
• Bubble noise from cryotrap
– When refilled, boiling liquid nitrogen shakes the cryotrap
and introduces noise through diffused light
– Noise reduces with time constant of about 1 day
– Cryotrap refill level reduced to reduce the excess of noise.
Optical Design Study
• Moving from principle to technical design
• Main open issues:
– non degenerate recycling cavities: we are
studying the impact on the infrastructure
and the solutions to suspend the extra
mirrors
– thermal compensation: we have to assess
the efficiency of the proposed solution and
the impact on the payload dynamics
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Thermo Compensation System for Adv
Virgo
Compensation plates will correct
thermal effects in the SRC
Shielded heating rings will
LIGO approach and reference solution for Adv VIrgo compensate HR surface
deformations
Hartmann sensors will be used to
monitor TM and CP phase profile
In the case of Advanced Virgo,
The positioning of CPs in the PRC
is a delicate issue due to its strong
impact with the suspension
systems and it will have to be
investigated in collaboration with
the other involved Subsystems
Red dots: shielded heating ring
Green rays: CO2 heating beams
Blue rays: sensing beams
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The Ad VIRGO payloads
Mirrors with double mass 20 k  40 kg
- New fibers
- New bonding and improved diagnostic
Critical payloads in the present OSD reference solution :
a) FP input mirror payload should include the compensation plate
Danger:
- spoiling the low acoustic dissipation of the suspension
- increasing the control system complexity
b) Beam splitter payload: two extra mirror to be suspended in the beam splitter tower
Requirements:
- seismic and acoustic attenuation
- low thermal noise contribution
- alignment control
-diffused light reduction
Main difficulty: lack of space in the tower
The conceptual study and the simulation is started already.
Prototypes are required to finalize the Technical Design
SUPERATTENUATOR
q
PZT
Tiltmeter
THE CASE FOR IMPROVED CONTROL
− Virgo inertial platform controlled in 4 d.o.f.
− Wind induced ground tilt proved to be a problem
− AdV: implement tilt control (6 dof)
− PZT useful on the short towers also to increase the
vertical attenuation
The SAFE facility installed @ Cascina
A full scale superattenuator is under preparation @EGO to test the 6 dof
control strategy
•New Inverted Pendulum (IP) legs (monolithic).
• Installation of the piezo actuators.
•Tilt meter and in general new sensor test
•The facility can host later the new payload prototype
Safety
structure
+
I.P.
I.P
+
Intermed.f
ilters
+
Payoload
The experimental hall @1500m West arm
Summary of highest priorities for the
2010 INFN-VIRGO request
• Support for our development activity for
completing the technical design of Ad Virgo
• Support for the data analysis activity on the
VSR2 collected data
• Support our mission on site (M.I.)
• Support our collaboration with LIGO on DA
(M.E.)
All our requests are not included in the Ad VIRGO
construction budget and are not supported by the
EGO budget!
The Internal Mission Justification
We checked that we have a mean value of
25 INFN-FTE
on site during the 225 working days of the year
- 15 from Pisa (25 €/day including travel exp.)
- 10 from the other INFN section (150 €/day
including travel exp.)
225*(25*15 + 10*150 ) = 421875 €
We need also to support the interaction among the italian groups
( accel. and phase cam.: Pd/Trento/Legnaro/Pi/Na, pay act.: FI/Urb –Pg-Rm1,
suspen. Tilt: Pi-Tov, coat. Ge-Pg-Fi/Ur/Tn)
Without the INFN man power VIRGO is dead !
2010 MILESTONES reported on the INFN –web page
15-04-2010:
Construction start of the cryotrap protype
15-07-2010:
Realease of the Final Technical Design for Adv.VIRGO
01-09-2010:
Start of the mirror superpolishing
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END
Thanks for your attention