Reports 1-1 of 1 Clear search Modify search
OBS (Summary)
hirotaka.yuzurihara - 16:30 Sunday 28 May 2023 (25416) Print this report
Operation Shift Summary

Operators name: T.Yokozawa, H.Yuzurihara

Shift Time: 8-16 (JST)
Summary:

Check Items:
VAC,CRY,TEMP There was no problem.
The temperature of EY 50K cooler is increasing.  (already informed to Kimura-san/Miyoki-san by Oshino-san.)
The temperature of EX 50K cooler is decreasing. (already informed to Kimura-san/Miyoki-san by Oshino-san.)

8:00 observation from previous shift time
11:41 lock loss (this is the longest lock during O4a : 12.4 hours)
12:00 observation
14:02 IPC glitch occurred. We started the PR3 alignment.
14:27 we finished initial alignment for PR3 alignment.
15:08 we started to wait at PRFPMI_RF_LOCKED.
15:43 observation (locked)
15:46 we found that the interferometer was not in science mode, due to SDF.  (K1:IFO-GRD_OK was False)
15:50 the interferometer is in science mode. (K1:IFO-GRD_OK was True)

We contacted Miyoki-san about this SDF issue soon and solved by YamaT-san. Details was posted by Yokozawa-san, see klog#25415.

Comments to this report:
takaaki.yokozawa - 16:40 Sunday 28 May 2023 (25417) Print this report
Between the PR3 alignment and PRFPMI RF lock, several GR->IR handover failure happened.
In this time, we kept with the PRFI_3F_LOCKED state, and wait until PRMI aignment drift stopped(Several minutes).
Then handover succeeded.
Search Help
×

Warning

×