Present:

     Caltech: Szabi Marka,  Peter Shawhan
     Florida: Jason Castiglione, Sergey Klimenko
     LHO: Dick Gustafson, Mike Landry, Robert Schofield, Daniel Sigg, John Zweizig
     LLO: Vijay Chickarmane
     Michigan: Keith Riles
     MIT: Rana Adhikari, Stefan Ballmer, Laura Cadonati, Peter Fritschel, ErikKatsavounidis
     Oregon: Ray Frey, Isabel Leonor

S2  Status Update Reports

• Investigation teams

 
• Data quality  (J. Zweizig, K.Riles)

John summarized a number of investigations documented on the S2 Data Quality Investigations page. John has written an offline DMT monitor to look for saturations at the photodiode or ADC level by working backwards from the ASQ channel, given the known filtering. He has found examples of such saturation in L1 S2 data. At the request of Sam Finn, John has looked for periods of extreme glitch rates (reported by DataQual), low and high. The rate distibutions looked reasonable for H1 and H2, but L1 had a period of zero rate recorded, which turned out to be when the injected calibration line was temporarily boosted by a large factor. John has also completed a rerun over the early LHO data to recover DMT trends that were lost in the T3 raid crash during the run (before backups were instituted). The corresponding 3-day summary plots have also been regenerated and posted on the investigations page.
KR gave a status update on the S2 DQ segment repository. Version 2 of the segment list is nearly ready for release. This version is more complete for L1 than for H1 and H2. See status update and repository page for more info.
 
• Calibration stability (G. Gonzalez, M. Landry)

The calibration team has had a number of telecons recently and will be meeting again soon. Updated H1 frequency series have been produced for Patrick Sutton to generate alpha/beta coefficients for with SenseMon. H2 and L1 should be available soon.
 
• Glitches (L. Cadonati, E. Katsavounidis

Laura gave a status report on the glitch investigation team's work to date. See the report for more details, but in summary, the team has looked at:
• DMT (glitch and glitchmon) trigger mining in 40 hours of L1 playground data, comparing triggers on auxiliary channels with those on ASQ (Syracuse)
• Correlated transients - L1, H1, & H2 (ASQ and other primary IFO channels) with WaveMon (Florida)
• DMT (glitch and glitchmon) trigger mining in 80 hours of H1 playground data (MIT), comparing DMT triggers on auxiliary channels with TFClusters triggers on ASQ (MIT)
• Burst candidates (used by burst group) in playground data - L1, H1, & H2 with time-frequency plots for each playground segment and associated histograms.
In addition, Rana has suggested some glitchmon config file changes, Nelson is looking at inspiral veto candidates, and John is providing information from his data quality investigations (see above).
 
• Violin modes (S. Klimenko, J. Castiglione)

Jason gave a status report on violin mode investigations. The team has looked at 10 hours of S2 data from each IFO, from sets of ten 1-hour segments. Fundamental and harmonic violin modes are clearly seen and frequency/Q values measured. As expected qualitatively, harmonics are not exact integer multiples of the fundamental. Future plans include taking longer time averages to see higher harmonics, longer individual segments to see finer structure, and correlation with accelerometer data to verify broadening of modes when the vertical bounce mode is excited. Rana suggested looking also for correlations in harmonic frequency value and arm cavity power.
 
• Steady-state correlations (N. Christensen)

No update.
 
• Bilinear couplings (S. Penn, V. Chickarmane)

Vijay is looking at L1 ETMX and other seismic channel trends to track down a suspected correlation between seismic noise and bilinear noise upconversion with the 60 Hz lines.
 
• Correlated inter-site environmental transients (R. Schofield)

Still waiting for production of combined PEM RDS at Caltech. Recent changes to LDAS now support the merging. Robert will work with Greg Mendell to get that going. Robert noted that bursts are generally higher during the day in Livingston than at night, which will affect the correlation analysis background estimates.
 
• Local environmental disturbances (R. Schofield)

Much recent and ongoing commissioning works concerns acoustic mitigation to reduce acoustic coupling into ASQ. To reduce coupling strengths, various clipping apertures have been removed, a new periscope design proposed, and more rigid legs for the optical tables installed. To reduce acoustic noise sources, insulation kits have been purchased for various electronic racks, and the HVAC duct work re-examined. It turns out there are many places (connectors, mainly) where there is only a single wall of duct instead of the desired two. The infamous dewar-induced lock losses caused by sudden shifts have not been eliminated by welding the dewar feet to the ground. It is now believed that the stick/slip process is internal to the dewar.
 
• Data access (P. Shawhan)

A new version of LDAS has been released that included merging of RDS and queries for any set of channels in various locations. For the time being, one must use guild (not getframes) to exploit the more general query features. Until very recently some xml-reading utilities did not work correctly with the new LDAS-generated lightweight data. Sergey wondered if RDS data is available on fortress/decatur. The answer is yes. Rana wondered if lars can point to the RDS. The answer is not yet. Rana also wondered when the upgraded data viewer (with access to DMT trends) would be in ligotools. The answer is soon.
 
• Data set reduction (I. Leonor)

Nothing new to report.
 
• Signal injections  - Burst group investigations (L. Cadonati)

Laura gave a status report on the burst group's study of the hardware signal injections during S2. In summary, reasonable results are seen, allowing reliable detection efficiencies to be computed. One sees strong correlations between injected signal strengths and detected strengths (detected by TFClusters and Power). Hardware and software injections agree qualitatively too. More quantitative studies are underway. For the most part, the detected strength is stationary throughout the S2 injections, with some exceptions in certain injected frequency bands.

A.O.B.

• Next detector characterization teleconference: Friday June 20, 2003 at 1:30 EDT