aLIGO LHO Logbook

H1 DetChar (DetChar)

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sharan.banagiri@LIGO.ORG - posted 07:45, Monday 15 July 2019 - last comment - 09:35, Monday 15 July 2019(50537)

DQ Shift for 8th - 14th June

DQ Shifter: Sharan Banagiri

Mentor: Pat Meyers

LHO Fello: Dripta Bhattacharjee

Link to DQ Shift: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20190708

Summary of the DQ Shift:

Mean duty cycle for the week of ~ 83.1%
Fairly large number of EQs especially at the end of the week, but the IFO rode through most of the, which however do increase the glitch rate
48 Hz line is still a major feature of the spectrum. Amplitude has increased since the beginning of O3.
The 90 Hz bump seems smaller this week than previous week
The 35 Hz line was louder than usual on thursday.
Hveto: H1:LSC-POP_A_LF_OUT_DQ is top channel for most of the week.
Spike in spectral ratios at ~ 20 Hz on the 8th. They go down again on the 10th.
The channel H1:SUS-ETMX_L2_WIT_L_DQ shows strong evidence for scattering on the 8th, 11th, 12th and the 13th.
PCALX: Similar behaviour as Dripta last week, where the largest line migrates from 3KHz to 1.5 KHz over the course of the week.
No new GW candidates

Some interesting and useful alogs.

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=50469
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=50481
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=50512

Comments related to this report

evan.goetz@LIGO.ORG - 09:35, Monday 15 July 2019 (50543)

Link

The observed PCALX line changing frequency is normal behavior where an injection into PCALX is made in order to measure the sensing function at high frequencies. This line is automatically adjusted in the Guardian according to a pre-determined schedule. Attached is a 1 week minute-trend time series of the injection frequency (H1:CAL-PCALX_PCALOSC1_OSC_FREQ) and corresponds to the changes noted in the DQ shift report.

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