aLIGO LHO Logbook

H1 CDS (ISC, SUS, TCS)

filiberto.clara@LIGO.ORG - posted 12:54, Tuesday 25 February 2020 - last comment - 17:07, Tuesday 25 February 2020(55291)

ALS EX Laser interlock reconnected to safety system

WP 8543
FRS 14250

Safety system at EX was restarted this morning. Power cycling the system cleared the interlock errors for both the ALS (FRS 14250, alog 55171 ) and PCAL (alog 55260).

The temporary bypassed jumper was removed and the ALS laser interlock reconnected to the safety system. With system down, we moved the 24V power for the safety chassis to its own dedicated power supply.

Effected systems from this work were powered back on.

ALS EY laser
ALS EX laser
EX ESD HV
SQZ laser
TCSX/Y lasers

F. Clara, C. Compton, R. McCarthy, T. Shaffer, and P. Thomas

Comments related to this report

jeffrey.kissel@LIGO.ORG - 17:07, Tuesday 25 February 2020 (55305)CAL, DetChar, INJ

Link

For future reference and data quality flags, the total time that PCALX laser was down is as follows (based on trending the channel showing the PCALX laser diode current, H1:CAL-PCALX_LASERDIODECURRENT):
2020-02-19 00:16:57 UTC to 2020-02-25 17:38:49 UTC 
1266106635 to 1266687547
580912.0 seconds
161.36 hours
6.7 days.