Agenda/Minutes on 2020/11/13

Zoom Meeting

CRY+VIS Interface Meeting

13:30-13:50

Participants: Takahashi, Hirata, Ikeda, Hagiwara, Aso, Yano, Kimura, Sato, Ushiba

• Post O3 Upgrade portal

• Disassembly of the Type-A tower was finished in Y-end (11/11). Evacuation of IYC will be started on 11/18.
• Schedule: Wire disconnection (IX 11/13, EX 11/19), Chamber evacuation (IY 11/20).
• Jig for the FC painting: Hirata-san made the 3D model of jigs for SR and BS.

• PF actuator: Measurement of coefficients --> calculation of the noise (by mid Dec.).

VIS Meeting

14:00-15:00

Participants: Takahashi, Hirata, Aso, Yano, Sato, Fabian, Washimi, Terrence, Tanaka, Sugiyama

Progress report

General

Type-A

• Disassembly of the Type-A tower was finished in EY (11/11).
• The wire for the cryo-payload was disconnected in IX (11/13).

Type-B

With Washimi-san.

• We inspected the BS BF in order to decide the size of a SDC M6 screw to buy. Hirata-san ordered a few (klog 15435).

• We connected the cables for the SRM OSEM and the IM picomotors. An adapter for the IM picos broke and I borrowed from SR3 for now.
• As preparation we turned on the optic fibre camera and realized it's missing a microSD card. Takahashi-san ordered one already.
• I reported to Yokozawa-san that the temperature in SRM was about 21.8 degrees Celsius. We need it warmer next week.

• SRM new problem: F1 fishig rod jammed at the lower end of its range. See klog 15447.
  

  • Some FRs don't jam when reaching the end of ther ranges, but others do.

  • The expeced position of the keystone at 23 degrees in vacuum is -980 um (klog 15461), which is likely too large to bring the keystone to zero with the coil-magnet actuator.

  • What to do? Following our current line of thought, we should remove mass from the BF. Another option would be:
    • Hope fo the best next week and fix the BF.
    • Leave the SF wherever it lands (at -980 um presumably),
    • Set the BF at zero and
    • Compensate the height of the mirror with at the F0 keystone or the IP jacks (better).

• Recovery of SRM still continues: I need to check why IM-Y is about -3 mrad whereas it should be close to -65 urad. Unfortunately we don't have the oplev for visual inspection of the beam.See klog 15463.

Type-Bp

Washimi-san, Akutsu-san, Miyo-kun, Sugiyama-san, Fabian.

• After Shimode-san fixed a minor problem with one of PR2 LVDT drivers, we installed it back and it worked!

• We measured the phases again. The results of almost all LVDT drivers used in PR suspensions are reported in klog 15457.

  • PRM BF recoil mass LVDT cards have not been examined because we need the problem with the misconnected cables solved.
  • One resistance in PRM SF GAS LVDT channel seems anomalous: it's value is only 1.2 Ohm whereas typical values are larger than 5 kOhm.

• PRM oplev breadboard with optics was installed on the pylon. They will turn the SLED on next week. See klog 15449.

Type-C

• [Sato](no progress)

Controls

Electronics

• The circuit boards for new combiner prototype were delivered. The circuit parts have not yet.
• Considering the mass production of new combiner using ICRR/NAOJ budget.
• No stock of Murata inductor in the market.
• We asked AEL to modify 16 LVDT cards (AD630 grounding and on-board D-sub connectors).

Towards O4

• Type-B remedy work will be started on 11/16.
• Schedule.

  • Arrangement of personnel in Nov. (table)

  • VIS

• Procedure documents.

  • Type-A tower installation

  • Limit switches

  • Limit switch connecting guide

  • Replacement of TF blades

  • Wire gluing in PR3

  • Type-B remedying work

• Criteria in the acceptance test.

Safety

Discussion

Travel Plans

The week from 11/16

• Takahashi: 11/16-20
• Sato: 11/16-20
• Hirata: 11/16-20

The week from 11/23

• Aso: 11/24-27
• Takahashi: 11/24-27
• Hirata: 11/24-27
• Sato: 11/24-27

Next meeting

• On 2020/11/20(Fri)