Status of Virgo

1

• Status of Virgo
• B. Mours

2
Main injection problem (2004)

• Input Mode cleaner mirror back scattering
• IMC instability when Power Recycling mirror
  aligned
• Solutions
• Sort term Factor 10 attenuation between IMC and
  PR mirror
• Only 0.7W injected in the ITF
• Long term add a Faraday isolator ? redesign the
  injection bench

3
Virgo Recent Progress

• October 2004
• First lock in recycled configuration.
• C5 run December 2004
• Recycled and Recombined modes.
• 2005 Commissioning activities
• Alignment
• Drift controls using wavefront sensing now on all
  d.o.f.,
• Most loops are also closed.
• Automation,
• Control upgrades, robustness,
• Noise hunting,
• Commissioning slow down by instabilities
  (jumps) during the first semester,
• C6 and C7 commissioning runs.
• Summer shutdown preparation
• New injection (bench, PR mirror, ISYS
  alignment).
• Data analysis preparation
• Study C-run data,
• Collaborative data analysis (LIGO-Virgo,
  Bar-Virgo).

4
Sensitivity evolution
5
C6 run

• July 29 August 13
• Duty cycles
• Locking 89
• Science mode 86

6
C6 Binaries Injections

• Inject NS-NS
• Online Analysis
• 1.2-1.6 Solar Mass
• Injections seen on the online SNRmax plots

7
C6 Burst Injections

• Inject Sine-Gausian
• Central frequency 460Hz
• Nominal SNR 15
• Example of the third injection
• Power filter algorithm
• Efficiency 90
• False alarm rate .3 event/sec
• Timing resolution 1.3ms

Centering of the North Bench quadrant!
8
C6 noise budget
9
Post C6 upgrades (I)
10
Post C6 upgrades (II)

• Increase of modulation index gt reduction of
  PR_zCorr impact
• Diffused light dumped on WE gt no more bump
  100-400 Hz
• Modulation frequency tuning
• BS coil driver upgrade
• And LA tuning

August 27th (600kpc) with NEO2 September 12th
(850 kpc) without NEO2
11
C7 run

• September 14 - 19
• Duty cycles
• Locking 70
• Science mode 65

12
C7 Hardware injections

• NS-NS events
• Two online analysis
• 1 hour of data ploted

September 19
1.2-1.6 S.M. Grid
September 15
Injected events
1-3 S.M. Grid
13
Virgo compared to LIGO
14
Virgo-LIGO joint analysis

• Working group for burst and inspiral events
• Up to now work on simulated data
• Project 1a Compare analysis pipelines on the
  same data sets.
• Project 2b Study the advantages of 3 sites for
  astrophysical sources
• Sky location, Detection efficiency
• 3 talks and papers (GWDAW9 and Amaldi 6)

Burst from galactic center
15
Virgo- Bars joint analysis

• AURIGA, ROG
• Burst events and Stochastic signals
• Project starting with software injection
• 4 hours of data
• Plan to analysis C6 C7

16
Next steps

• Sept-Dec 05 Injection shutdown
• 2-3 months of work
• New injection bench ? Power should go up by a
  factor 10
• New recycled mirror ? Better controls
• Miscellaneous changes
• Followed by the new injection system
  commissioning
• 2006 Commissioning data taking
• Alignment, controls,
• A science run by the end of 2006 (coincidence
  with LIGO-S5) ?
• 2007
• Data taking/Commissioning/Upgrades
• 2008-9 Virgo
• 50W laser, New electronic, New mirrors ? (not yet
  decided)
• 2011(?) Advanced Virgo
• 200W laser? New beam geometry? New mirrors?...