Miriam, Evan and Dave:

Over the past few weeks we have been investigating the correlation between end station sus computer model glitches and blips seen in the calib_strain channel. Some past glitch events were analyzed by hand, which proved to be time consuming. I have written a python script to capture glitches in real time and log them to a file (script is report_fec_glitches.py in the cds/h1/scripts area).

Today I analyzed 20 glitches which occurred between 4/12 and 4/15. I have written up this analysis on the following wiki page: https://cdswiki.ligo-wa.caltech.edu/wiki/EndStationSusGlitchBlipAnalysisApril2017

As the investigation continues, results will be added to this wiki page.

The raw data can be found in /ligo/cds/lho/h1/fec_glitches/2017/04

Executive summary: about 35% of SUS front end computer glitches appear to cause a blip in calib_strain. The detailed sequence of ADC, Timing and IPC errors differs significantly between glitches.