Caltech: Ron Drever, Peter Shawhan, Patrick Sutton, John Zweizig
     CSUDH: Ken Ganezer
     LHO: Mike Landry, Fred Raab, Vern Sandberg
     LLO: Mark Cenac, Brian O'Reilly, Giovanni Santostasi
     Loyola: John Whelan
     Michigan: Keith Riles
     Oregon: Ray Frey, Brian Stubbs
     Penn State: Mike Ashley, Sam Finn

• Data quality segment repository -- S2 update) (John Zweizig,Keith Riles)

KR reported that version 5 DQ segments for S2 have been released, with flags for residual periods of the run when injected calibration lines were absent. Many thanks to JohnZ and Xavi for tracking these down.
 
• High time-resolution calibration information (Sam Finn, Albert Lazzarini)

Sam presented results from H1 of tracking calibration line amplitude & phase with a Kalman filter approach. In general, it would be desirable to track calibration changes faster than 1 minute (see recent detchar presentations by Gaby Gonzalez and Xavi Siemens), and a Kalman filter offers the potential of better robustness against noise than a straight heterodyne. Sam uses a 10-Hz band around the calibration line and reports back the amplitude and phase of AS_Q w.r.t. the excitation channel every 1/10 second. Sample time series of the amplitude / phase confirm non-Gaussian fluctuations, and a power spectrum of the amplitude shows a 1/f behavior up to the Nyquist frequency of 5 Hz.
KR suggested that Sam talk with Xavi to see if this method seems suitable for use in generating h(t) and talk with Sergey Klimenko who studied different line tracking algorithms during S3, including straight heterodyning.

DMT Software Status & Plans:

• Planning for "Detector Investigation Camp" following August LSC meeting (Keith Riles)

KR outlined tentative plans for a 3-day detector investigation camp immediately following the August LSC meeting, where experimenters and analysts would be invited to learn about a variety of diagnostic software tools, including how to write DMT monitors. John Whelan wondered in what environment attendees would be DMT programming. John Zweizig thought that one could arrange for linux-compatible binaries to be available for laptops, in case full DMT installation proved difficult for participants.
KR will be contacting prospective instructors soon and alerting the collaboration to the planned camp.
 
• Status of DMT infrastructure:

 
• John Zweizig: Version updates, etc
  John will be at Hanford next week where he plans to upgrade the online machines with a new tagged DMT version 2.9 and with upgraded OS and compilers. The changes will then propagate to Livingston online machines. Most of the recent infrastructure changes are in low-level routines and should be transparent to users. The only new monitor he plans to install is Natalia's latest PTMON. Any other new/upgraded monitors for online installation should be provided to John no later than Monday.
  
  
• Patrick Sutton: Calibration infrastructure
  The primary remaining task is setting up the definition and reading of reference calibration info (point functions and miscellaneous constants from EPICS channels at the time of the original calibration measurement).  Patrick is working with John to make this work. John is changing the DMT data accessor to support the reading of a frame file with the frequency series and constant info. Patrick will also put in an option to read back alpha & beta values from the same file, when available (from a previous run).

 
• Status of DMT monitors under substantial development / revamping / debugging:

 
• Tim Bodiya / Keith Riles: SpecMon
  Keith reported that Tim will be arriving soon at LHO for the summer to finish shaking down SpecMon.
  
  
• Ken Ganezer: seis_blrms
  Ken has inserted some code into seis_blrms for checking inconsistent time stamps, both as a potential fix, and to allow simulation of data dropouts. The code changes have not yet been tested, however.
  Fred Raab mentioned that Szabi's ShapeMon monitor has been alarming continually for quite a while and requested that it be fixed. KR will e-mail Szabi.
  
  
• Sergey Klimenko: BurstMon
  Sergey was unable to make the call, but has found in his BurstMon surprisingly large non-stationarity in the S2 data, even for H1. He will report at the next detchar telecon (and the next Burst group telecon).
  
  
• Tim Olson: SpectrumArchiver
  No report.
  
  
• Steve Penn: BicoMon and BicoViewer
  No report, bur Fred mentioned that a Geneva high school teacher will be spending part of the summer at LHO and  working with Steve to look at output from BicoMon.
  
  
• Giovanni Santostasi: PulsarMon
  Giovanni is coming up the DMT learning curve. He had hoped to work at Natalia at LLO this month, but she happens to be out of the country at the moment. Nonetheless, he has written some skeleton code and will now try to compile and link it.
  
  
• Brian Stubbs / Rauha Rahkola: SuspensionMon
  Brian is about to graduate and leave Oregon, but Rauha will take over maintenance of the SuspensionMon code until a new student becomes available. There is one remaining problem not yet understood, in which appending to trend files doesn't work.
  
  
• John Whelan / Mark Cenac: StochMon
  Mark has just started as a SURF student at LLO and is getting set up with computer accounts. As beginners, he and Giovanni may find it useful to collaborate on their respective monitors. For the time being, the plan for implementing StochMon is to compute expected sensitivity for a pair of interferometers, where the actual "local" IFO noise is used together with a representative noise spectrum from the "other" IFO. 
  
  
• Natalia Zotov: PTMon
  On vacation.
  
  
• John Zweizig: LSCMon et al
  Working on some infrastructure issues in PSLMon. The urgency to get LSCMon working is less urgent, now that the effect of the low-byte data corruption in AS_Q is believed to negligible.

A.O.B.

• Ken Ganezer mentioned that he has been looking with FFT simulations at the effect of thermal lensing on sideband power in the recycling cavity and sees promising results. KR suggested he contact Erika D'Ambrosio who showed some similar simulation results at the March LSC meeting.
  
  
• Next detchar telecon:  Friday June 25 at 1:30 p.m. EDT  (S2/S3 investigations)