andrew.lundgren@LIGO.ORG - posted 01:24, Tuesday 15 September 2015 - last comment - 04:12, Tuesday 15 September 2015(21526)
Short glitches about every half-second, only in DARM
This 2 Hz comb is actually glitches every half a second. It seems like the period is not exactly half a second. They appear in DARM but not MICH, SRCL, or PRCL, so it's probably not a bad PR or SR mirror driver. Attached are a few Omega scans. The first is several seconds long and shows that these are very short and span about 40 to 100 Hz. The next three Omega scans are 4 seconds apart, showing that these don't sit right on the integer second and have a period that is not quite 0.5 seconds.
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The comb shows up in the ETMY top stage F1, F2, and SD but none of the others. See attached plots.
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Nutsinee, Thomas A., Ran omega scan for 1126336348 (Sep 15 2015 07:12:11 UTC), and found that the once-per-0.5s glitches repeating glitches are noticeable in: H1:OMC-DCPD_SUM_OUT_DQ H1:ISI-ETMY_ST2_BLND_RZ_GS13_CUR_IN1_DQ H1:ISI-ETMY_ST2_BLND_Z_GS13_CUR_IN1_DQ H1:PEM-EY_MAG_EBAY_SUSRACK_QUAD_SUM_DQ H1:PEM-EY_MAG_EBAY_SUSRACK_X_DQ H1:PEM-EY_MAG_EBAY_SUSRACK_Y_DQ H1:PEM-EY_MAG_EBAY_SUSRACK_Z_DQ Full omega scan: https://ldas-jobs.ligo-wa.caltech.edu/~tabbott/H12HzComb/
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