E11 Segment Data Quality Repository

Peter Shawhan, Keith Riles

Quick link: most recent version of segment lists (at bottom of page)

This page has links to files containing information about science-mode segments in each detector during the E11 run. Science mode segment numbers for each interferometer were incremented each time a control room operator pushed the "GO" button to indicate start of science mode conditions. As in the past, the segment numbers will be permanent, and many e-log entries refer to them by IFO and segment index (e.g., H1-27). This repository provides data quality summary information on individual segments, based on the work of many investigators. Data quality flags are listed for time intervals, and links to more detailed information are provided, where appropriate. Links to segment manipulation tools (e.g, segwizard) are also included.

For each detector, there is an ASCII file ( E11H1_seginfo_work.txt , E11H2_seginfo_work.txt) which details any information learned about each segment which indicates that it is bad or potentially bad data. These files are maintained by hand. As information is learned and added to these files, they are periodically copied to different names incorporating a specific version number, and the information is also distilled and presented in a few other files:

E11*v*_seginfo.html : a copy of the seginfo file with some HTML mark-up.
E11*v*_segs.html : a more compact, fixed-format list, consisting of:

Segment index (hyperlinked to the seginfo file)
Start time
End time
Duration
Bitmask value representing bad-flags which apply to this time interval
List of bad-flag names, if any, which apply to this time interval

bad-flags

E11*v*_segs.txt : like E11*v*_segs.html , but without the hyperlinks.

Note that any given segment will retain the same numerical index in all versions of the lists, but it may acquire bad-flags indicating that it is bad or potentially bad.

The goal of this effort is to determine what data is suitable for searching for gravitational waves, and to provide this information in a machine-readable form. The success of this effort will depend on individuals examining the data, identifying effects which might cause the data to be bad, and then evaluating which effects are serious enough to disqualify data. Contributions are eagerly awaited; Keith Riles (kriles@umich.edu ) will collect this information and maintain the segment info files.

Version 00 files -- Generated in real-time at Hanford

Single IFO:
Segment lists (ASCII):
Single-IFO: E11H1v00_segs.txt , E11H2v00_segs.txt
Double-IFO: E11H1H2v00_segs.txt

Version 01 files -- December 18, 2004

This release takes explicit account of the following issues:

Severe H1 glitching due to end-mass controller (Alex Ivanov, Dave Barker, Daniel Sigg) - LHO elog entry
Repetitive H2 glitching due to cycling dust monitor (David Strom, Nathan Hindman) - LHO elog entry
Smoke alarm chirping in the LVEA (Mark Lubinski) - LHO elog entry
State of H2 AS2I servo (on=okay, off=better, saturated=bad) (Keita Kawabe, Gerardo Moreno) - LHO elog entry
Beam centering servo off (Betsy Weaver, Fred Raab, Mark Lubinski) - (LHO elog entries: 1, 2)
Person in the LVEA (from elog)
Ratty IFO conditions (from elog)
No calibration line -- version 1 (from elog)
Non-standard configuration - filters, gains, etc. (from elog)
Intervals outside official E11 period (Peter Shawhan)
Missing data (Peter Shawhan)
Lock loss and pre-Lock loss (Peter Shawhan)

Of interest to calibration aficianados:

List of pre-run calibration intervals (Mike Landry, Ben Johnson)

Single IFO:
Segment lists (html): E11H1v01_segs.html , E11H2v01_segs.html
Segment lists (ASCII): E11H1v01_segs.txt , E11H2v01_segs.txt
Full segment info (html): E11H1v01_seginfo.html , E11H2v01_seginfo.html
Full segment info (ASCII): E11H1v01_seginfo.txt , E11H2v01_seginfo.txt

Double IFO:
Segment lists (ASCII): E11H1H2v01_segs.txt

Notes on coincidence segment lists

Notes on two incorrect version-0 segments (added 12/22/04)

Graphical summaries of segment data quality