Transcript ppt

Virgo Status
D. Buskulic (LAPP Annecy)
for the Virgo Collaboration
Annecy (LAPP), EGO, Firenze/Urbino, Frascati, Lyon (LMA), Napoli,
Nice (OCA), Orsay (LAL), Paris (ESPCI), Perugia, Pisa, Roma
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Status of the detector
Status of the computing
Status of the Data Analysis activities
Plans
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Sensitivity evolution
Run C7
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Detector
Computing
Data Analysis
Plans
Run C6
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Runs C6 and C7
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Beginning 2005
Detector
Computing
Data Analysis
Plans
commissioning work
 Achieved reasonable stability at the beginning of summer
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C6
14 days in July-August
 Duty cycle in science mode : 86%
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C7
– Automation of the lock
– Stability : longest lock was 40h
5 days in September
 Duty cycle in science mode : 65 %
 Better sensitivity
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Detector
Computing
Data Analysis
Horizon for SNR=8, optimaly oriented 1.4/1.4 M NS-NS binary Plans
Horizon distance for NS-NS
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C6 : Drift control on all and automatic alignment on 2 mirrors
Mpc
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04/08: stray light beam
dumped on NE
10/08: realignment of the beam
on Input Mode Cleaner
11/08: improved
power stabilization
=> reduction of power noise
Non stationarities
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Improvements after C6:
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C7
automatic alignment on 5/6 mirrors, reduction of the shot noise, tuning
of the controls,…
Andromeda
Maximum C6
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Detector
Computing
Data Analysis
Plans
Horizon for SNR=8, optimaly oriented 10/10 M BH-BH binary
Horizon distance for BH-BH
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C6
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C7
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Detector
Computing
Data Analysis
Plans
C7 noise budget
control noise
angular alignment noise
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shot noise
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Detector
Computing
Data Analysis
Plans
Pending and foreseen improvements
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Replacement of the injection bench
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Allows to go to the maximum power (8W)
on output of the IB
 beam power x 10, shot noise /3
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Done since beginning of December
Integration and tests in progress
Replacement of the recycling mirror
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old
Better mechanical behaviour
Increase reflectivity 92% -> 95%
 Increase of the recycling factor
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Improvement of the automatic alignment
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new
Should improve sensitivity at low frequency
Dump stray light, reduce control noise,
improve acoustic isolation,…
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Reconstruction
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Principle
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Detector
Computing
Data Analysis
Plans
Dark fringe signal corrected from various effects
– controls (use coil currents corrected from pendulum effects)
– optical (cavities)
 Find L from dark fringe by staying in time domain
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Calibration lines
– used to track the optical gains
– should be removed by reconstruction
Sensitivity using TF
made with calibration
hrec FFT on 10 sec,
averaged 30 times
 what remains is used
as error estimators
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Reconstruction runs online
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Analysis can run online
Byproduct : horizon to assess
commissioning
Additional check to come
– optical calibrator will be used beginning 2006
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Data Quality
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Data Quality
Detector
Computing
Data Analysis
Plans
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A set of flags for assessment of data quality
Online web pages for viewing the interferometer status
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Set of instrumental vetos to define a "science mode"
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Noise studies
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Used C6/C7 data (but not only) to make noise studies
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Data and noise (non)stationarity
Transient searches for vetos
Injection of noise (acoustic, magnetic) and analysis
Environmental noise studies (lightnings…)
Software tools
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Detector
Computing
Data Analysis
Plans
NAP
Lines monitoring and catalog
Transient identification and catalog
Talks and posters by
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F. Garufi, Posters
"Noise modeling to detect non linearities in VIRGO h-reconstructed data
using neural networks"
"Normal/Independent nonstationarities in VIRGO h-reconstructed data"
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Computing status and usage
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On site
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Detector
Computing
Data Analysis
Plans
Online analysis farm
– 32 Opteron bipro 2 GHz, 4 GB RAM/processor
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Used during C6/C7 to run CB search algorithms
Used to do offline analysis between runs
– CB searches
– LIGO-Virgo
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Foreseen extension of the online analysis farm
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Triple the computing power during 2006
In Bologna and Lyon computing centers
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Raw data of all C-runs transferred
Offline analysis performed
– Pulsar searches
– Bursts
– LIGO-Virgo
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Data analysis with C-runs data
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Work with older C5 data (dec. 04)
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Detector
Computing
Data Analysis
Plans
Pulsar search on 1.4 days of C5 data
Estimate the sensitivity of pulsar blind search on C6/C7
CB, Bursts searches
Use hardware injections during C6/C7
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Inject CB and bursts signals
Analyze them !
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Importance of vetos
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Talks and posters by
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F. Marion, Talk
"Status of inspiral search in C6 and C7 Virgo data"
L. Bosi, Poster
"The commissioning Virgo run C7 analyzed with the inspiral search
pipelines Merlino and Mbta"
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Sensitivity comparison
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Detector
Computing
Data Analysis
Plans
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Joint analyses
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Start joint working groups
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Comparison of search algorithms
Coincident analysis
Coherent analysis in progress
Joint analyses with bars
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Setup methods
assess the gain on doing common DA
Joint analyses with LSC
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Detector
Computing
Data Analysis
Plans
Joint Virgo/Auriga/ROG analysis
Talks and Posters by
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M.A. Bizouard, Talk
"LIGO/Virgo joint analysis"
G. Guidi, A. Ortolan, Poster
"Virgo/Resonating bars joint analysis"
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Distant and not so distant plans
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End 2005
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Detector
Computing
Data Analysis
Plans
New injection system commissioning: 1 Month… in progress
2006
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Interferometer restart: 1 Month
– New sensitivity curve: February ?
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Recycled ITF commissioning: 3 Months
– Start data taking during weed-ends and nights
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2007
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A possible shutdown to fix problems + Commissioning and noise hunting
Data taking
2008: Virgo +
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Noise hunting: 4 Months
Science Run (NS-NS horizon (optimal) around 15 Mpc?)
50W laser, New electronics, Monolithic suspensions
New mirrors ? (not yet decided)
2011(?): Advanced Virgo
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200W laser? New beam geometry? New mirrors?...
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The End
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