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• VISMinutes20220715

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2022/7/15 13:00-13:40

Participants: Takahashi, Kimura, Akutsu, Yokozawa, Uchiyama, Yasui, Sato, Ushiba, Miyoki, Aso, Hirata

Post O3 Upgrade portal

Schedule

• IX: Offload of GAS filters.
• EX: Performance check at 80K.
• IY: Health check and recovery.
• EY: Health check and recovery. Installation of the MNV oplev.
• Type-B: Health check.
• Type-Bp: Investigation of the previous data on PR2. Calibration factor of BFH in PRM.
• Type-C: Health check of the IMMT1/2.

Status

• Replacement of cables: EXT and BF temp.
• TM height setting:
• Oplev: Investigation of the glitches.
• ACC:
• Commissioning in air:
• Commissioning in vacuum: Try to see DRAM signals.
• Acceptance check: Type-Bp.
• New vacuum pumps: Installation of the ion pumps in IX/IY is scheduled on 8/4,5.
• Heater control: Pending.
• TMS:

Discussion

VIS Meeting

Date: 2022/7/15 14:00-

Participants:

Summary Report

Type-A

• Health check. Recovered the F2 in IY and the F1 in EY.
• Offloaded the GAS filters in IX.

Type-B

* Ushiba-san plotted most of Type-B transfer functions in a way suitable for comparison. After remeasurig a few of them, I have the impression that the suspensions are healthy, although it seems there's still an unknown: in BS IM-R and IM-P see to have additional peaks in in SRs. I need to check in more detail.

• We measured TFs at the individual coils and plotted them in a suitable way for comparison. I should double-check, but a cursory comparison suggessts they are all fine. No klog yet.
• We checked the polarities of all the coil-magnet actuators in the four suspensions and everything seems consistent with what we know. No klog yet.

Type-Bp

* On request from Takahashi-san: the oldest PR2 TF measurements I was able to find were from 26th of July 2019.

Type-C

Electronics

Control

Schedule

• Type-A:
• Type-B: Health check.
• Type-Bp:
• Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 7/19

• Sato: 7/19-22
• Hirata: 7/19-22

The week from 7/25

• Takahashi:
• Sato: 7/26-29
• Hirata: 7/26-29

Next meeting

• 2022/7/22(FRI)