• KAGRA
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• VISMinutes20220729

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2022/7/29 13:00-13:30

Participants: Takahashi, Hagiwara, Uchiyama, Yokozawa, Tomaru, Hirata, Yasui, Ushiba, Aso, Miyoki

Post O3 Upgrade portal

Schedule

• IX:
• EX:
• IY: Offload of the BF and F2 GAS.
• EY: Large fluctuation due to the ADC noise.
• Type-B: Trip of SR2.
• Type-Bp: Offload of the traverses. Calibration of the SF LVDT in PR2. Acceptance check (EQ stopper, magnet polarity). Height check and Review in the next week.
• Type-C: Beam dump.

Status

• Replacement of cables: EXT and BF temp.
• TM height setting: Type-Bp
• Oplev: Investigation of the glitches. Replacement of the light source was effective.
• ACC:
• Commissioning in air:
• Commissioning in vacuum: CARM lock is OK. Try to see DRAM signals. SR3 is fluctuating.

• Acceptance check: Dropbox paper

• New vacuum pumps: Installation of the ion pumps in IX/IY is scheduled on 8/4,5. Side hatch in SR on 8/5.
• Heater control: Pending.
• TMS:

Discussion

• Next meeting: 2022/8/5(FRI) 14:00-

VIS Meeting

Date: 2022/7/29 14:00-14:20

Participants: Takahashi, Uchiyama, Ushiba, Fabian, Washimi, Hirata

Summary Report

Type-A

• Offloaded the BF and F2 in IY.

Type-B

• I compared the BS IM transfer function with the SUMCOM model. The motivation was that, apparently the BS measurement had more peaks than the SR ones. Nevertheless, nothing wrong was found, the SUMCOM model and the measurements seem to be consistent. I used a list of resonant modes, but I shoud generate the calculated plots and show them along the measured ones.
• The power cable for the SR2 LVDT driver was disconnected by accident. We connected it to a socket inside the clean room in a more convenient place.

Type-Bp

• The BF Damper actuation was offloaded to the Traversers in all suspensions.
• We checked the polarity of the magnets in the BF Dampers and IMs in all suspensions. The TM magnets are not accesible.
• We took pictures of all the security structure screws.
• We recalibrated SR2 SF LVDT.

Type-C

Electronics

Control

Schedule

• Type-A:
• Type-B: Health check.
• Type-Bp: Height check(8/4). Review(8/5).
• Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 8/1 (F2F meeting: 8/1-3)

• Takahashi: 8/4-5
• Hirata: 8/2-5

The week from 8/8 (Obon week 8/11-16)

• Takahashi:
• Sato:
• Hirata:

Next meeting

• 2022/8/5(FRI) 14:30-