Differences between revisions 9 and 10

Agenda/Minutes of the VIS Meeting on 2020/6/19

2020/6/19 14:00 -

Participants:

Progress report

For SR baffle installation I checked the mirror height reference marks done by Terada-san. They are still there. See klog report 14573.
SR2 decay times: following the issue of the mode IP-L 406 mHz, whose damping time was 35 seconds longer with the control system on (klog entry 14510)
- I checked the UGF to be 85 mHz. Being lower than 406 mHz it should not have an affect according to certain expectations. The OLTF gain at such frequency was 0.22. Still, I put a notch (f=406 mHz, Q=10 and depth 40 dB) in the filter and repeated the measurement. The decay time with the control on decreased by 40 seconds.

Post Obs. tasks are on going. Real-time model was modified in this week. Sensor correction for SRs and SR suspension update are planed in the next week.
The extended chief meeting was held on 15th. DRFPMI commissioing was scheduled in Jul.-Aug. The tasks towards O4 will be started from Sep.
Proposal on suspension commissioning was shown in the extended chief meeting.
"Remote/onsite support on VIS troubles by VIS group members with shift style" is requested for the DRFPMI commissioing.
Schedule towards O4 was revised again.

cf. Post Obs. task (Request), Task for O3c (Plan, Sheet), Task towards O4 (List).

Correction of concerned topics for the evaluation meeting on 22nd (google spreadsheet).

KAGRA/Subgroups/VIS/VISMinutes20200619 (last edited 2020-06-19 15:15:23 by RyutaroTakahashi)

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-  * I checked the UGF to be 85 mHz. Being lower than 406 mHz it should not affect such mode according to certain expectations. Still, I put a notch (f=406 mHz, Q=10 and depth 40 dB) and repeated the measurement. '''The decay time with the control off decresed by 40 seconds'''.
+  * I checked the UGF to be 85 mHz. Being lower than 406 mHz it should not have an affect according to certain expectations. The OLTF gain at such frequency was 0.22. Still, I put a notch (f=406 mHz, Q=10 and depth 40 dB) in the filter and repeated the measurement. '''The decay time with the control on decreased by 40 seconds'''.