1. Virgo Status Detector Status Computing Data Analysis status and Plans
B. Mours (LAPP Annecy)
Detector Status
Computing
Data Analysis status and Plans
LSC Meeting, Nov 2003
LIGO-G X

2. Recent history Sept 01-July 02: Central ITF (CITF) commissioning
5 Engineering RUN (Sept 01 – July 02)
Aug 02: Shutdown for Virgo upgrade
Connect the arms
Change mirrors, beam size, modulation frequency
Upgrade Mode Cleaner …
July 03: End of installation; Inauguration
Frequency(Hz)
Displacement sensitivity (m/Hz)
E0 (September 2001) E1 E2 E3
E4 (July 2002)
Virgo
E4 Shot noise
CITF design s. noise
LSC Meeting, Nov 2003
LIGO-G X

3. Alignment status (Now)
LSC Meeting, Nov 2003
LIGO-G X

4. North Arm Cavity First lock: October 28 First sensitivity estimation
m/sqrt(Hz)
First sensitivity estimation
Dominated by frequency noise
Transmited power
LSC Meeting, Nov 2003
LIGO-G X

5. Output Mode Cleaner Locked with the North Cavity locked
LSC Meeting, Nov 2003
LIGO-G X

6. Next steps North Cavity West cavity: Recombined Michelson:
Linear alignment (work in progress )
Laser frequency stabilization (next weeks)
West cavity:
Tuning local control (work in progress)
Ready for lock: in December
Recombined Michelson:
Start work on January 2004
First science run: fall 2004 ???
LSC Meeting, Nov 2003
LIGO-G X

7. On site (Cascina) Computing
Purpose:
Online/On-time analysis
Commissioning support
Storage
20 TB available
10TB for the raw data circular buffer (1 month)
Additional 50 TB almost installed
Data analysis computing
16 Bi-pro Linux PC available
2004: add a ‘300 Gflops machine’ (450 KEuros)
Network:
34 Mbits/s now
Upgraded to 155 Mbits/s in 2004
LSC Meeting, Nov 2003
LIGO-G X

8. Off site Computing 2 National Computing centers: To be used for:
Bologna (+ Italian lab using Grid) and Lyon
Ressources shared with other HEP experiments
To be used for:
Data archiving and distribution for the runs:
Medium term (‘One year on disk’): Bologna
Long term: Lyon
Simulation
Offline analysis
Request for 2004:
46000kSPECINT2000.day (about 150 CPU*365days)
8 time 2003 use
80% requested by periodic searches
LSC Meeting, Nov 2003
LIGO-G X

9. Data Analysis Organization
Commissioning activities
investigations with E. run data
Calibration, control performances, detector noises, lines studies, glitches identifications…
Driven by Engineering runs
Data Analysis working groups
Calibration/Reconstruction
Noises studies
Periodic searches
Burst searches
Binary coalescence searches
Stochastique
 Up to now, mainly driven by Mock Data Challanges
(3 MDC’s in 2003)
LSC Meeting, Nov 2003
LIGO-G X

10. CITF Analysis: Example I
E4 Sensitivity curve understanding
Internal noise + electronic & shot noises
Laser frequency noise +
Internal noise + electronic & shot noises
LSC Meeting, Nov 2003
LIGO-G X

11. CITF Analysis: Example II
Binary search on E4 Data
Events distribution (1.4 S.M.)
Very few detector glitches
Horizon distance
LSC Meeting, Nov 2003
LIGO-G X

12. MDC: Example for Bursts
Inject ZM events in 9 hours of E4 noise
Non stationarity for MDC3
Lock segment for MDC3
Produce
Calibrated channel
Whitened channel
Run different algorithms:
Mean Filter (MF),
Slope filter (ALF),
Peak Correlator (PC)
Generalized Delta Filter (GDF)
Get:
Event list, efficiency,SNR ratio,…
LSC Meeting, Nov 2003
LIGO-G X

13. MDC: Example for Binary
Inject events with:
Different masses, SNR, models
Run different analysis:
Merlino: Parallel flat search
MPI based
Multi-Band Template Analysis
Get:
Speed,
Event list,
Efficiency, false alarms
SNR ratio…
The Horizon follows the non-stationarity
LSC Meeting, Nov 2003
LIGO-G X

14. Coming up data Commissioning runs: MDC4: January 04
C1: Nov (One Arm)
C2: Jan (One/two arms) with linear alignment
MDC4: January 04
run part of the online pipeline
Some data conditioning tests (like lines removal)
Goal: Be ready for the first Virgo science run
Fall 2004 ??
LSC Meeting, Nov 2003
LIGO-G X