S2/S3 Glitch Investigation Update

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Presentation transcript:

S2/S3 Glitch Investigation Update Laura Cadonati for the Glitch Investigation Group LSC meeting, Livingston March 17, 2004

Wrap-up of S2 Glitch/Veto Search Large number of channels analyzed for veto search Inspiral group: adopted as veto L1:LSC-POB_I 70 Hz HP Burst group: no veto adopted for upper limit search favorite candidate was AS_DC (non-linear coupling with AS_Q at all three interferometers, esp. at L1)

Inspiral Veto: L1:LSC-POB_I (N. Christensen, G. Gonzalez, P. Shawhan) a selected playground segment the worst playground segment Dead time = 3% Veto efficiency = 11% at SNR>8

Non-Linear Coupling AS_DC - AS_Q (R. Adhikari, S. Ballmer) At all three IFOs, burst candidate events best correlated with glitches in unfiltered AS_DC. Similar effects seen in SPOB_MON and WFS* AS_Q 1000 Hz HP “At low frequencies, the model is that there is a broadband noise level in AS_Q which increases monotonically with the AS_DC level. e.g. the stack shakes, the mirrors twist and the light level seen in AS_DC doubles for ~1 sec. In a whitened time frequency plot this looks like a broad band, 1 sec glitch in AS_Q. It will show up at all frequencies where no other noise source is dominant. The SPOB_MON veto is also a low frequency veto. The model here is that as the effective sideband recycling gain goes down, the gain in all of the LSC servos goes down. Of these, DARM is the first to go unstable and so we see a burst centered around the lower end of the 'phase bubble' (65-70 Hz). “ (Rana) AS_Q 100 Hz HP AS_DC no filter REFL_DC no filter SPOB_MON no filter

would have been a “safe” veto (tested on hardware injections) Burst Group Veto Choice for S2 (A. Di Credico, Syracuse, MIT, M. Ito, R. Schofield) Preliminary selection of candidate vetoes based on preliminary ETG productions (Oct 03): L1 : LSC-AS_DC (3 s, nofilter) H1 : LSC-AS_DC(3 s, nofilter) H2: no candidate Final choice of veto for S2 burst analysis (Jan 04): no veto used Channel Deadtime % TFCLUSTERS 130Hz-400Hz Veto Efficiency 400Hz-1000Hz Veto efficiency WAVEBURST (triple coincidence) L1: LSC-AS_DC 4.42% 13.7% 19.6% 39.5% would have been a “safe” veto (tested on hardware injections)

WaveMon Veto for WaveBurst Candidates (K. Franzen, S. Klimenko) WaveBurst L1 confidence WaveBurst H1 confidence Multiplicity of channels analyzed with WaveMon Test veto only on triple-coincidence WaveBurst events Before and after veto plotted vs WaveBurst confidence Most veto by MICH_CTRL H1 L1 combined triple H2 WaveBurst H2 confidence WaveBurst triple coincidence confidence (GC)

Glitches in S3 (P. Richerme, MIT) Scanned the database for AS_Q/aux coincidences So far only analyzed glitches from glitchMon (will look also into Zglitch, PTmon, WaveMon...) Science segments in S3: L1: 533 segments ( 368 hours) H1: 508 segments ( 1169 hours) H2: 718 segments ( 1074 hours) Several coincidences AS_Q/aux-chan seen (will not necessarily be true on burst candidates). The results shown in the next few slides are all very preliminary: the search just started...

L1:LSC-AS_I 70 Hz high pass, > 4s (same as AS_Q) Efficiency = 35% Success = 22% Deadtime=0.5% L1:LSC-AS_I 70Hz HP L1:LSC-AS_I 70Hz HP L1:LSC-AS_I no filter L1:LSC-AS_I no filter unfiltered > 4s Efficiency = 8.5% Success = 24% Deadtime=0.08%

More Effects at L1 Peaks in lag plot also seen in: L1:LSC-MICH_CTRL 70Hz HP channel HP filter Dead time Efficiency Success POB_I 70Hz 0.06% 15% 86% POB_Q 0.04% 14% 93% MICH_CTRL 0.11% 17% 65% PRC_CTRL 0.07% 10% 83% AS_DC 10Hz <0.1% 0.13% 70% Peaks in lag plot also seen in: REFL_AC REFL_DC REFL_Q SPOB_MON L1:LSC-POB_I 70Hz HP L1:LSC-REFL_Q 70Hz HP L1:LSC-REFL_DC 10Hz HP L1:LSC-POB_Q 70Hz HP

Glitches at H1 H1:LSC-AS_DC 10Hz HP H1:LSC-AS_I 70Hz HP channel HP filter Dead time Efficiency Success AS_I 70Hz 0.02% 26% 62% 10Hz 0.14% 12% 3% POB_I 0.03% 24% 35% POB_Q 0.01% 64% REFL_Q 5% 44% AS_DC 0.16% SPOB_MON 8% 34% REFL_DC 0.05% 11% 7% H1:LSC-REFL_DC 10Hz HP H1:LSC-POB_I 70Hz HP

Glitches at H2 Also: SPOB_MON, REFL_Q, REFL_I ... H2:LSC-AS_DC 10Hz HP H2:LSC-AS_I 70Hz HP channel HP filter Dead time Efficiency Success AS_I 70Hz 0.03% 6% 65% none 0.3% 4% POB_I 0.13% 10% 51% POB_Q 0.01% 2.4% 84% AS_DC 10Hz 0.08% 2% 23% AS_AC 30Hz <0.01% 0.5% 63% REFL_DC 0.6% 68% H2:LSC-REFL_DC 10Hz HP H2:LSC-POB_I 70Hz HP Also: SPOB_MON, REFL_Q, REFL_I ...

Inspiral Candidates (N. Christensen) Online production of inspiral triggers – used times to scan all PEMs H1:LSC-AS_Q GPS 756505524: 10-120 Hz bandpass - LN Dewar glitch? H0:PEM-LVEA_SEISZ a few others have a magnetometer in the neighborhood but no smoking gun so far.... IN PROGRESS!

Summary S2 glitch investigation: S3 glitch investigation: Broad rerun over channels/filters ~ complete Non-linear correlations AS_DC (SPOB_MON, REFL_DC) and broadband bursts Burst/Inspiral veto choice made (none/L1:LSC-POB_I) S3 glitch investigation: Scan of glitchMon triggers in the database - some interesting correlations visible in lag plots and scatter plots. The search has just started...