• KAGRA
• Subgroups
• VIS
• VISMinutes20220722

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2022/7/22 13:00-13:25

Participants: Takahashi, Hirata, Uchiyama, Aso, Ushiba, Yokozawa, Yasui, Ikeda, Hagiwara, Kimura

Post O3 Upgrade portal

Schedule

• IX: Investigation of the glitches.
• EX: Monitoring of cooling.
• IY:
• EY:
• Type-B: Health check. Replacement of the satellite amplifier.
• Type-Bp: Calibration factor of BFH in PRM. Offload of the traverses, height adjustment, and preparation for the review in the next week.
• Type-C: Health check of the IMMT1/2.

Status

• Replacement of cables: EXT and BF temp.
• TM height setting: Type-Bp
• Oplev: Investigation of the glitches.
• ACC:
• Commissioning in air:
• Commissioning in vacuum: Try to see DRAM signals.
• Acceptance check: Type-Bp.
  • Opening the chamber (to offload the traverse)
    • A02_Polarity Check: Measurement of the magnet polarities by the magnetometer.
    • A03_Rubbing Check: Final visual inspection.
    • A08_Calibration of local sensors: SF LVDT in PR2.
  • Others
    • A01_Cabling Check: Summary.
    • A04_Actuator Range(FR): Summary.
    • A06_Height measurement: Adjustment of the TM height. Fixing of the setpoints.
    • A09_Sensor Spectra: Summary.
    • A10_Transfer Function: Summary.
• 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: 2022/7/22 14:00-14:20

Participants: Takahashi, Ushiba, Uchiyama, Fabian, Tanaka, Aso, Washimi

Summary Report

Type-A

• Investigation of the glitches is ongoing in IX.

Type-B

• Yamamoto-kun write a script to calculate the IP diagonalization matrices from the geometrical information. In some cases it coincides with what we had, althoug in others it was different because people carried out additional diagonalization. I changed all the matrices to the geometrical ones in order to check the TF in such conditions. The new TFs were posted in the klog this morning.
• Hirata-san corrected some discrepancies in some dimensions in the IP 2D-CAD.
• We checked SR3 V2 and SRM H1 OSEMs becuase the individual TFs had different amplitudes than in other suspensions. In both cases, we exchanged cables with other OSEMs and measured TFs again. In both cases the origin of the discrepancy seems to come from within the vacuum chamber.

Type-Bp

• Preparing for the acceptance check document.

Type-C

• Health check of the IMMT1/2. The calibration value was revised.

Electronics

Control

Schedule

• Type-A:
• Type-B: Health check.
• Type-Bp: Offload of the traversers. Height adjustment. Preparation for the review.
• Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 7/25

• Takahashi: 7/25-29
• Sato: 7/26-29
• Hirata: 7/26-29

The week from 8/1

(F2F meeting: 8/1-3)

• Takahashi:
• Sato:
• Hirata:

Next meeting

• 2022/7/29(FRI)