Present:

     Caltech: Ron Drever, Peter Shawhan, Patrick Sutton, Stan Whitcomb, John Zweizig
     Florida: Sergey Klimenko
     Hobart-Smith: Steve Penn
     LHO: Szabi Marka, Fred Raab , Robert Schofield, Daniel Sigg
     LLO: Gaby Gonzalez
     Michigan: Keith Riles
     MIT: Laura Cadonati
     Oregon: Ray Frey, Isabel Leonor, Rauha Rahkola, Brian Stubbs
     Syracuse: Alessandra DiCredico

E10 & S3 Planning:

• Interferometer status (Fred Raab - LHO, Gaby Gonzalez - LLO)

H1 is frozen - no more invasive work. It locks nicely with decent locking stability. All 10 wave-front-sensing (WFS) degrees of freedom can be locked, and four beam pointing degrees of freedom are controlled. So far the controls apply only at low frequencies, however. Optical levers must still be used at higher frequencies. The sensitivity is about 3 times better than for S2. It was hoped a factor of 4 would be reached, but that hasn't occurred yet. A mystery is why the violin modes are being excited to amplitudes about 4-5 times the thermal expectation (in S2 the violin modes were close to thermal - see Sergey's report below). The noise is quite smooth at low frequencies after much acoustic mitigation work, but there is one broad peak at 95 Hz remaining.

H2 is in much worse shape, having received much less attention than H1. Its freeze occurs next week. There is still a rebuild happening on the REFL table and WFS wiring to do. The interferometer runs okay, but has poor sensitivity.

L1 is now locking regularly after a major rework on optical tables. It is struggling to come back to previous best sensitivity after in-vacuum work over the summer. The IFO is expected to be reasonably stable by the start of E10. It is hoped to attain somewhat better sensitivity in S3 than in S2 after recent acoustic mitigation work. It is unlikely that high-power running will be possible.



• Scimon shifts - KR

The  E10/S3 scimon shift schedule was released last weekend. Because of groups unable to fulfill their quotas and a misunderstanding about one group's correct FTE count, there are seven expert slots at LHO for which no group is presently assigned. Volunteers are welcome.

S2  Investigations Reports (investigation teams )

• Data quality -  (John Zweizig, KR)
  John has added updates to his data quality investigation page . A study of three recurring strong narrow resonances in L1 data (violin mode fundamental, violin next harmonic, internal test mass mode at@ 3500 Hz) that contribute significantly to their DataQual-monitored bands has been carried out. For every L1 DQ segment, the data have been fit to an exponential ringdown. Typical values for the decay constants are 0.016, 0.030, and 0.0025 seconds, respectively.
  He has also tried systematically to find auxiliary channels where excess power correlates with excess power in AS_Q bands. Two channels, AS_AC and AS_DC stand out as having strong correlations, consistent with observations of the veto group. These channels look promising for defining new data quality flags.
  KR mentioned briefly that no new DQ flags have been defined since the release of version 3 segments on August 29. There remains a fair amount of H2 investigation to be done before the archive approaches parity among the IFO's.
  
  
• Calibration stability (Gaby Gonzalez)
  Gaby reminded everyone that the final S2 calibration has been released on the calibration home page with some explanatory remarks . There was some discussion of the auxiliary calibration-related channels needed for the S3 RDS samples. Patrick volunteered to send Isabel the list of channels he needs for SenseMonitor to run offline.
  
  
• Glitches (Laura Cadonati)
  Laura summarized a great variety of glitch studies going on within several different groups.Briefly, after recent detailed playground studies, the burst and inspiral groups are getting ready to choose vetoes for the final analyses.  Mich_ctrl is once again an important channel. So is AS_I, but it has been shown to be unsafe. AS_DC appears quite interesting, with "bumps" correlated with AS_Q broadband glitches.It is hoped that veto choices will be wrapped up by October 10. Glitch rates have also been studied as a way of characterizing data segments. Histograms show evidence of outliers.
  
  
• Violin modes (Sergey Klimenko)
  Sergey showed a comprehensive table of  measurements of violin modes and harmonics. Average amplitudes (mfm) are shown, along with fitted frequencies. Coupling coefficients are derived that are somewhat less than the expected value of 8 * 10^-6 , which is hard to understand unless the servo control loop is damping the modes. Jason Castiglione is working on a document to summarize all of the findings. A list of all times of large excitations of violin modes is being produced. So far not many mid-lock excitations have been seen.
  
  
• Steady-state correlations (Nelson Christensen)
  Nelson could not attend the meeting, but will present recent results at next Thursday's detchar telecon.
  
  
• Bilinear couplings (Steve Penn)
  Steve has add further improvements to the new BicoMon, including DMT viewer output.Specification of frequency pairs and bandwidths will soon follow. The new engine for computing bicoherence has been tested against Vijay's matlab code. Eventually the same engine will also be put into the foreground BicoViewer program. Steve mentioned some nice work by David Steussy on bicoherence (see Nelson's link above).
  
  
• Correlated inter-site environmental transients (Robert Schofield)
  The tapes of merged PEM channels from each site have finally arrived at LHO and are now being loaded on to local disks.
  
  
• Local environmental disturbances (Robert Schofield)
  Robert summarized recent acoustic mitigation work. A factor of 10 mitigation of coupling has been demonstrated at the H1 dark port table already. More recent work on a new periscope, new 2" optics and new tables legs give at least another factor of 10, where measurements of dark port couplings are now limited by coupling at the REFL port. Even more recent work on the REFL table promises further improvement, but Robert hasn't had a chance to verify it yet. H2 has also had new optics and table enclosures added recently. No further source reduction (duct work, rack removal) will be done until after S3. It's likely that the infamous liquid nitrogen dewar glitches will persist. An attempt to tip the dewar had limited success. Since temperature variations are thought to drive the glitches, bleak, overcast days are to be desired for S3.
  Robert requested that there be a monitor of channel hopping and flatlining for certain PEM channels during S3, since problems are now seen every couple of days. The troubles are not yet understood. John offered to add the channels to BitTest to check for flatlining, and Szabi offered to do the same for ShapeMon to check for channel hopping.
  

DMT Software Status Review:

 
• Status of DMT infrastructure

 
• John Zweizig: Version updates, deadlines, etc.

John had nothing to report on infrastructure changes since last week. KR wondered why most LHO monitors were down. John surmised that recent changes in trend directory disks had goofed most of them up. He promised to restart them soon. The deadline for new code to be run during E10 / S3 remains October 15.


• Status of DMT monitors




• Dave Chin / Tim Bodiya / Keith Riles: LockLoss and ServoMon/SpecMon

KR reported no changes in LockLoss/ServoMon since last week. SpecMon is being worked on to address problems reported in the M3 mini-run.


• Masahiro Ito: glitchMon (no report)



• Sergey Klimenko: LineMonitor and WaveMon 

Sergey has hesitated to add a heterodyning option to LineMon because of uncorrected noise bias (in contrast to his standard method). KR urged adding the heterodyne anyway to allow study of fluctuations in calibration line amplitude determination. Sergey agreed to try to have something ready for E10.  He also reported that the summary page updating trouble seen in M3 has been fixed.
WaveMon now monitors about 50 channels and cannot keep up in real-time on some machines, but on a blade, the program can keep up, and there is no longer a need to keep four manifestations of the program running.


• Szabi Marka: IRIG-B, TimeMon, and ShapeMon 

Szabi will look at adding Robert's requested PEM channels to ShapeMon. He is optimistic that DMT alarm silencing will be ready by E10..


• Tim Olson: SpectrumArchiver (no report)



• Steve Penn / Vijay Chickarmane: BicoMon / BiLinMon

See Steve's report above on BicoMon.
 
• Brian Stubbs: SuspensionMon

Working on alarms/triggers at the moment. Will work next on config files. Only side sensor channels will be monitored during S3.
 
• Patrick Sutton / Mike Ashley: SenseMonitor / LineAmp and RayleighMonitor

Patrick has completed the code changes to SenseMonitor to track Darm gain and input matrix changes. He has begun testing the code. The new code looks at both AS_Q and the excitation channel, to avoid dependence on config file parameters. 

Mike reported that a new interactive version of LineAmp (matlab program) includes the capability to look at injections and compare with AS_Q. He has had to use a new method to get data into Matlab, since there seems to be a problem with the LDAS data reading function.



• Natalia Zotov: PTMon (no report)



• John Zweizig: BitTest,  DataQual, HistCompr, PSLMon, and SegGener

John will be putting AS_DC and AS_AC into DataQual's list of channels to monitor, given their importance in S2 (see John's report above).

A.O.B.

• Next detector characterization telecon: Thurday October 9 at 1:30 EDT (** note unusual day **)