S2 / S3 Investigation Reports  (any updates since LSC meeting)

• Interchannel correlations ( S3 LHO microphones ,  S2 intersite ) (Nelson Christensen)

Nelson showed correlation plots between a variety of LHO microphones and H1:LSC-AS_Q from the S3 run. At a bandwidth of  0.01 Hz, a number of significant coherences are seen, despite the recent dramatic broadband reductions in acoustic coupling. Nelson will talk with Robert Schofield about some of the frequencies observed and will cross-check the peaks he sees with the recent LHO compilation of mechanical resonances put together by a SURF student working with Mike Landry.
Nelson also showed intersite AS_Q correlation plots from the S2 run. There remains a visible comb of  16 Hz harmonics thought to be artifacts of DAQ buffering. At 0.01 Hz bandwidth, the lowest visible harmonic is at 80 Hz. There is also evidence of a weak, intermittent coherence at about 84.5 Hz that is not yet understood. At both sites, there is correlation visible between AS_Q and magnetometer channels.
 
• Glitches / Burst/Inspiral search group vetoes (Laura Cadonati, John Zweizig)

Laura reported that S2 burst veto studied are ongoing. The most significant development since the November LSC meeting has been John Zweizig's study of  OSEM sensor glitches, following up on an observation by Daniel Sigg. John has written a new DMT monitor (based on the PSLMON package) to trend 6-sigma glitches on all H1 and H2 OSEM sensors. He reported that glitches were very high in amplitude (~20-30 sigma) on recycling mirror sensors until a faulty ADC unit was replaced. Laura also reported that Katherine Rawlins has been studying veto candidates around the time of GRB030329 in S2 and has found interesting signatures in the optical level channels.
 
• Calibration   (Mike Landry)

Mike and Gaby have produced official, representative S3 strain curves for H1 and L1, respectively. Mike is now working on H2. These curves will end up in Albert Lazzarini's compilation of blessed plots for presentation & publication.
 
 
• Timing (Daniel Sigg)

Daniel reported that the atomic clock at LHO drifts at about 50 ns/day w.r.t. GPS time, well within its specifications. In general S3 timing looks very good.
 
• Hardware signal injections (Peter Shawhan)

Pulsars have been turned off in S3 for three weeks (resuming December 22 with the strongest pulsars disabled). A handful of burst/inspiral waveforms were injected recently with more accurate actuation functions. Unfortunately, the correction for a violin-mode notch was not perfect and led to large residual impulse at ~350 Hz, enough to knock the IFO's out of lock on loud injections. The plan is to redo the injections without trying to invert the notch. So far not many injections have been made at L1 because of low IFO duty cycle, but more attempts will be made soon. Further stochastic injections are planned for near the end of the run. Daniel wondered if any tests had been made for glitchiness in the nominally smoothly varying pulsar injections. No one knew of any systematic tests done so far, although it would be straightforward to check the recorded excitation channel if any glitches were suspected. Running one of the standard DMT glitch monitors on the excitation channel might be technically problematic, given its ultra low-noise.
 
• Reduced data set generation - channel list (Philip Charlton, Isabel Leonor)

Latency between the sites and the MIT Tier 2 center is running about 3 hours now. In general RDS generation has been going well at both sites. There have been occasional red flags reported by the RDS monitors when tape drives are in high demand, but nothing serious.
 
• Data quality (S3 segment list - H1 , H2 , L1 , segment stats - H1 , H2 , L1 ) (John Zweizig, Peter Shawhan)

Peter has created S3 segment lists that update every 5 minutes. John has created a set of statistics pages on the segments that updates less frequently, using trends outputted by selected DMT monitors. Histograms are a planned addition. Betsy Bland is collecting elog comments at LHO for eventual flagging of bad segments / subsegments. KR is working on a GUI program for viewing / downloading / annotating segment info.
 
• Violin modes (S. Klimenko, J. Castiglione) - No update.

 
• Bilinear couplings (S. Penn)

No update, but Fred Raab wondered if BicoMon could be used to look for bicoherence between the large-optic vertical bounce modes and other noise below about 70 Hz. Steve said yes and will talk with Fred offline. KR wondered if any significant bicoherence has shown up so far in S3. Steve confirmed having seen increased seismic activity correlated with bicoherence between power mains and other bands, but he has not had time to do a systematic study.
 
• Correlated inter-site environmental transients (R. Schofield) - No report.
• Local environmental disturbances (R. Schofield) - No report

 
• Data Access (Peter Shawhan)

DMT monitors running on the CIT saiph machine have been running slowly because of competition for tape drives and a lot of unnecessary tape rewinds by the SAM-QFS system. Peter is working on a pre-staging script to get around the problem by running 'artificial" LDAS jobs on the same tape.

DMT Software Status Review:

• Status of DMT infrastructure

 
• John Zweizig: Version updates, etc.

A tagged DMT version 2.7 is now running at the sites. A few changes to code and configuration have been made "on the fly", however. A variety of infrastructure improvements are in the works for a version 2.8 release after the run ends. Changes include: 1) correct handling of zero-length arrays by FrDump and FrCompare; 2) a fixed bug in the DatEnv class for aligning time strides; 3) writing out of triggers to files (will be useful for a future grid-enabled DMT); 4) support of data compression and detector blocks by FrWriter; and 5) a reworking of the FSeries class. The new code can be found on saiph. (Note added later by KR: John announced later that four new DMT machines are now available at CIT for offline analysis, working equivalently to saiph.)
 
• Szabi Marka: Alarms and web interface - Update by e-mail

There has been some positive and no negative feedback on the silencing version of the LHO DMT alarms page. KR has asked Szabi to go ahead and enable the LLO version and link it to the S3 web page. It appears that the DMT viewer web emulator is working fine again after a bug fix just before S3 began



• Status of DMT monitors

 
• Dave Chin / Tim Bodiya / Keith Riles: LockLoss and ServoMon/SpecMon - no update

 
• Ken Ganezer: seis_blrms

No report, but KR has asked Ken to address the now-infamous seismic "glitches" that are falsely reported after a DMT frame loss.
 
• Masahiro Ito: glitchMon - no report

 
• Sergey Klimenko: LineMonitor and WaveMon

No update on WaveMon, but it is now understood why alarms have not been working for dropped calibration lines so far in S3, and the bug has been fixed. Sergey has a new version which is ready for swapping in.
 
• Szabi Marka: IRIG-B, TimeMon, and ShapeMon - no report

 
• Tim Olson: SpectrumArchiver - report by email

SpectrumArchiver is now running at both sites under the process manager, and the scimon instructions for checking functioning of the monitor are up to date, with working scripts. A private version has been running at LLO since early November, providing a mostly complete archive, but no Hanford version was running until a couple of days ago. Planned for after S3 is a reworking of the code to allow channels to be specified via a config file.
 
• Steve Penn: BicoMon - no update

 
• Brian Stubbs: SuspensionMon

Brian is running a new version on Oregon computers with alarm support and which tests on OSC conditions for setting short-term triggers (enables short-term trigger thresholds only if in science mode, since mirrors tends to get jostled more when out of lock). Also refining thresholds. Will plan to swap in new version at the sites for last few weeks of the run.
 
• Patrick Sutton / Mike Ashley: SenseMonitor / LineAmp and RayleighMonitor

Mike reported that he is generating alpha files with LineAmp and will be doing detailed comparisons with LineMon on amplitude noise.
 
• Natalia Zotov: PTMon - no report

 
• John Zweizig: BitTest, DataQual, HistCompr, PSLMon , SatMon, and SegGener - no updates

A.O.B

• Next detector characterization telecon: Friday January 2 (but may be postponed if insufficient attendance likely)