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What happened since the March LSC

Data quality and veto studies for the S4 burst search: Where do we stand? Alessandra Di Credico Syracuse University LSC Meeting, Ann Arbor (UM) June 5, 2005. What happened since the March LSC.

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What happened since the March LSC

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  1. Data quality and veto studies for the S4 burst search:Where do we stand?AlessandraDi Credico Syracuse UniversityLSC Meeting, Ann Arbor (UM)June 5, 2005

  2. What happened since the March LSC • Require the coincidence of H1 and H2 lock segments in order to perform Data Quality (DQ) /glitch study (cross talk of the instruments during single IFO operation) • Safety analysis of all KleineWelle (KW) channels: mostly OK but with conditions applied (to trigger significance, AUX/ASQ ratios) • DQ investigations on seismic/acoustic environmental channels and follow-up on their coincidence with KW triggers • Investigation of auxiliary channels related to a particular detector’s misbehavior: “light-dip” effect • Dust monitors study vs KW single counts (DQ/veto work of relevance and in progress) • Undertake the coincidence of H1 and H2 triggers for a separate DQ and glitch studies (couplings of PEM channels is more pronounced) • LIGO Event Display took off the ground • Event-by-event scanning of KW triple coincidence events from S4 • BlockNormal channel-by-channel investigations

  3. KleineWelle for glitch studies in S4 Interferometric channels in all LIGO detectors H1, H2, L1: strain-recording: LSC-AS_Q LSC-DARM_ERR auxiliary: LSC-AS_AS_I LSC-AS_AC LSC-PRC_CTRL LSC-MICH_CTRL LSC-POB_I LSC-POB_Q LSC-REFL_Q LSC-SPOB_I ASC-WFS1QP ASC-WFS2QP ASC-WFS3IP ASC-WFS4IP SUS-ETMX_OPLEV SUS-ETMY_OPLEV SUS-BS_OPLEV Environmental channels: H0:PEM-BSC1_MAG1X H0:PEM-BSC5_MAGX H0:PEM-BSC5_MIC H0:PEM-BSC6_MAGX H0:PEM-BSC6_MIC H0:PEM-BSC9_MIC H0:PEM-BSC10_MAGY H0:PEM-BSC10_MIC H0:PEM-ISCT1_MIC H0:PEM-ISCT4_MIC H0:PEM-ISCT10_MIC H0:PEM-LVEA_MAGX H0:PEM-LVEA_MIC H0:PEM-RADIO_LVEA L0:PEM-EX_MAGX L0:PEM-ISCT1_MIC L0:PEM-ISCT4_MIC L0:PEM-LVEA_MIC L0:PEM-RADIO_LVEA • KleineWelle was run on a number of IFO and PEM channels during the S4 run • Near real-time statistics and diagnostics remain a good point of departure in order to get the day-by-day picture • http://lancelot.mit.edu/~lindy/s4/report • http://lancelot.mit.edu/~kats/daily.html • http://www.physics.syr.edu/research/relativity/ligo/restricted/dicredic/S4analysis.html

  4. Our GW trigger pool: global picture • KleineWelle analyzed in near real-time 97% of the 1818815 sec (~21 days) of common H1-H2 lock acquisition • In L1, >99% of the 1877685 sec (~21.7 days) were analyzed • Triple coincidence (H1-H2-L1) observation was 1429138 sec (~16.5 days)

  5. Data quality studies - SEISMIC • Extensive work done by Fred Raab and Justin Garofoli. Examined all seismic channels looking for correlations with up-conversion events in the GW channel (70-110Hz). Selected 4 interesting channels for LHO (LLO). Among those H0:PEM-LVEA_SEISX(Y) are the most interesting in terms of vetoing efficiency for KW triggers. • These seismic events could be correlated with ADC overflows and with transient dips in the stored light in the arm cavity, as measured by the ASC-QPDX_DC and ASC-QPDY_DC channels (Peter Shawhan)

  6. Data quality studies - ACOUSTIC • Examined all microphone channels in the frequency band 62-118Hz (61-119 at LLO) • Minute trends recorded by PSLmon and a list of minutes with elevated noise stored in files, together with the corresponding average amplitude (John Zweizig) • Correlation of these flags with KW triggers not really strong. Example of best case: H0-PEM-BSC9 • (H1 single) Efficiency of 2.3% (success ratio = 34.1%) , dead-time of 1.12% • (H1 coinc) Efficiency ~2 times higher

  7. Data quality studies - DUST

  8. S4 vetoes • Full analysis results available at : http://lancelot.mit.edu/~kats/s4_veto_summaries_more.txt • Relevant preliminary results (auxiliary channels which present a high efficiency in vetoing both single IFO and coincident events) : • H1 – AS_I, AS_AC. PRC_CTRL, POB_I, POB_Q, MICH_CTRL, WFS1_QP • H2 – AS_I, WFS1_QP, WFS2_QP, WFS2_IP, MICH_CTRL, POB_I, PRC_CTRL • L1 – AS_I, PRC_CTRL, POB_I, WFS1_QP, AS_AC

  9. Action items on the burst group’s data quality and veto studies front • Repeat KW production – software review reveal a rather minor bug in significance calculation • Investigate oddities • Finalize dust veto/DQ • Repeat veto analysis with safety conditions applied • Find intersection, union (“OR”) of channels • Decide where we draw the line for selecting vetoes (aka threshold, FOMs…) • Repeat glitch analysis for WaveBurst time-lagged triggers • Undertake high-frequency glitch studies for high frequency S4 search • Undertake quantifying frequency dependence of vetoes • Compare notes with BlockNormal findings

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