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Status of Virgo
Gabriele VajenteINFN Pisa and Scuola Normale Superiore di Pisa
On behalf of the Virgo Collaboration
11th Gravitational Wave Data Analysis Workshop Potsdam, December 18th 2006
GWDAW 11 December 18th , 2006 – Gabriele Vajente 2
Virgo collaboration
New groups joined the collaboration
ESPCI ParisLAPP LAL OrsayLMA LyonOCA
INFN Perugia INFN Firenze INFN NapoliINFN PisaINFN Roma 1
NIKHEF
INFN Roma 2
GWDAW 11 December 18th , 2006 – Gabriele Vajente 3
Restart after shutdown
Last winter shutdown for hardware upgrades
Injection bench replacement to run with higher input power (10 W enter the ITF)
Power Recycling mirror replacement with new monolithic mirror, higher reflectivity (95 %)
PR mirror mechanical transfer function OLD NEW
GWDAW 11 December 18th , 2006 – Gabriele Vajente 4
Thermal issues
Higher power produces thermal effects
Lock acquisition long (~20 min)Thermal transient is a critical periodWait for 10 min after reaching dark fringe conditionNeeded a reduction of input power to 5.5 W (entering the ITF)Need for a thermal compensation system, work starting
BS Pick-off power Lower sideband Higher sideband
GWDAW 11 December 18th , 2006 – Gabriele Vajente 5
WSR3 and WSR4 were canceled for bad conditions
Week-end Science Run
Periodic short data taking started in September 2006start moving towards a science run operationtake snapshots of the commissioning progresstake clean data in controlled conditionslight organizationpriority always on commissioning
WSR1 September 08th - 11th
WSR2 September 22th - 25th
WSR3 October 06th - 09th
WSR4 October 13th - 16th
WSR5 November 10th - 13th
WSR6 December 01th - 04th
WSR7 January 12th - 15th
GWDAW 11 December 18th , 2006 – Gabriele Vajente 8
Duty cycle and horizon in WSRsH
oriz
on fo
r N
S N
S (
aver
aged
) [M
Pc]
WSR1
Duty cycle 87.7%
Longest lock 15 h
WSR2
Duty cycle 68.7%
Longest lock 27 h
WSR5
Duty cycle 64.2%
Longest lock 10 h
WSR6
Duty cycle 80.5%
Longest lock 18 h
GWDAW 11 December 18th , 2006 – Gabriele Vajente 9
Dependence on weather conditions
The horizon is affected by microseismic conditions
Sea activity
Wind
Suspension control improvements on-going
Ho
rizo
n N
S-N
S o
pti
mal
[M
Pc]
Sei
smic
act
ivit
y [a
.u.]
Sei
smic
act
ivit
y [a
.u.]
RMS 220 mHz – 1 Hz
RMS 30 mHz – 100 mHz
GWDAW 11 December 18th , 2006 – Gabriele Vajente 10
Noise budget
Below 50 Hz control noise (longitudinal and angular)
Above 1kHz frequency noise
and shot noise
Intermediate region
WSR5
GWDAW 11 December 18th , 2006 – Gabriele Vajente 11
Acoustic noise / diffused light
The main suspect is acoustic and seismic noise from benches in air
Through diffused and scattered light effects
Investigations on-going
Projection of acoustic noise introduced by the detection bench, measured with acoustic noise injections
GWDAW 11 December 18th , 2006 – Gabriele Vajente 12
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
GWDAW 11 December 18th , 2006 – Gabriele Vajente 13
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
Analysis of data quality (talk by E.Cuoco)
Studies on veto procedures and efficiency (poster by M. Del Prete)
Search fro bursts from GRB 050915a (poster by A. Corsi)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 14
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
On-line analysis perfomed using Merlino and MBTA algorithms(talk by L. B. Bosi)
Study on coherent analysis with a network of ITF(poster by S. Birindelli)
Improvements in the timing accuracy(poster by D. Grosjean)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 15
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
Coincidence analysis between C6 and C7 run (talk by C.Palomba)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 16
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
Analysis of prospect of detection in a network search Virgo/LSC(talk by G.Cella)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 17
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
Search and removal of lines(poster by I. Fiori et al.)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 18
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
Analyzed 24 hours of data in coincidence during Virgo C7 run
ILIAS-WG2 methodological paper under preparation(Talk by L. Baggio)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 19
Brief overview of Data Analysis at Virgo
Virgo search groups
Bursts
Binary inspirals
Periodic signals
Stochastic background
Noise studies
Virgo-Bars network
Virgo-LIGO collaboration
Comparison of calibration and pipelinesMethodological work on simulated dataExchanges of short data segments for developing and testing networkanalysis methods.
GWDAW 11 December 18th , 2006 – Gabriele Vajente 20
Prospects for the future20
0720
0820
09
Virgo WSRsVirgo commissioning
Virgo+ upgrade
Virgo+ commissioning
Virgo+ Scientific Run
Virgo commissioning
TIM
E
Virgo Scientific Run (in coincidence with S5)
GWDAW 11 December 18th , 2006 – Gabriele Vajente 21
Virgo+
50 W laser, F=150 cavitiesLow loss suprasil end mirrorsMonolitic suspensions
1 10 100 1000 1000010-23
10-22
10-21
10-20
10-19
10-18
h(f) [1
/sqrt(H
z)]
Frequency [Hz]
50W/2 + new losses model 50W/2 + new losses model + F=150 50W/2 + current mirrors Nominal Virgo 50W/2 + new losses mod+FS suspensions+F=150 Virgo+ with Newtonian Noise
NN
Shot noise decreasedThermal noise decreased
GWDAW 11 December 18th , 2006 – Gabriele Vajente 22
SummaryWSR program started and continuing
with good duty cycleimproving sensitivity (high frequency almost at measured shot noise, comparable with LIGO)
Commissioning continuesbig efforts in the 50 - 500 Hz region
Goal to have a Science Run in coincidence with LSC S5Plans for Virgo+ upgrade