Agenda/Minutes on 2020/10/2

Zoom Meeting

CRY+VIS Interface Meeting

13:30-

Participants:

• Post O3 Upgrade portal

• Schedule

• Cable bandling bellow BF.Cable bandling BF-CRYO.pdf

VIS Meeting

14:00-

Participants:

Progress report

General

• Sugiyama-san(ICRR, Uchiyama Lab.) will join VIS group, mainly for reinstallation of Type-A tower in Y-end.
• [Takahashi, Miyo, Ikeda] We plan to test the heater control at the cross tube in IX or IY on Oct. 20-21.
• Limit switches will be reviewed by SEO on Oct. 9th.

Type-A

Type-B

Report of the week of the 28th of Septermber

• Measured the resonant frequency of BS IP (15136). it's not too different to what I had measured with a higher temperature. I haven't measured the other ones.

• I calculated we require to put 132 grams on top of BS Bottom Filter in order to bring F1 to nominal position at zero with the fishing rod in midrange. See Type-B remedying work document.

  • Taking into account the weight of the F0 yaw stepper motor (330 grams) that we need to install, and the amount of ballast on F0 keystone (413 grams), we can see the F0 load is overweight by 50 grams.

  • To fix this, Hirata-san designed a new F0 keystone top plate far ligher than the current one (JGW-T2012090). It should work well.

  • Next week I will go to the mine and put aside the 132 grams of ballast divided into two equal parts.

• In the context of calculating the amount of ballast required in SR3 I realized that when moving the BF keystone to -1.47mm the system touches something and free oscillations stop (15122). This is not a problem currently but it should not happen. More investigation is required. It touches before the fishng rod reaches midrange.

• Despite this problem it was able to roughly estimate we require to remove 76 grams from the IM and add 43 grams on top of the BF. See Type-B remedying work document.

  • I calibrated (roughly) the keystone displacement in terms of stepper motor steps, and then calculated the total displacement all the way to midrange position, which is beyond the position where it currently touches. Using the spring constant I calculated we need to remove 76 grams.

  • F1 fishing rod is completely jammed -429 um.To bring it to nominal we need to remove 33 grams from its load. However, we will remove about 76 grams from the IM, which implies we'll need to add 43 grams on top of BF.

  • We have a record of the mass we put on top of SR3 IM (Type-B remedying work) and it seems hard to remove 76 grams in a symmetrical way. I'll need to design some masses that should allow us flexibility. Work in progress.

• I opened a GitHub issue for concrete weekly TO DO lists (Type-B work TO DO list #85). I assigned Hirata-san, Washimi-san and myself.

Type-Bp

Type-C

Controls

Electronics

Towards O4

• RSE Trial was extended to Oct. 12th.
• Preparation work.
  • The preparation work will be started on Oct. 8th.

  • Schedule and assignment of personnel

  • Cleaning procedure.

  • Inventory sheet.

  • Cable removal.
• Schedule.

  • Chamber opening

  • 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.
• Presentation
  • PAB (10/8)
  • Chief Meeting (10/12)

Safety

Discussion

Travel Plans

The week from 10/5

• Takahashi: 10/7-10/9
• Sato: 10/7-10/9
• Hirata: 10/7-10/9

The week from 10/12

• Takahashi: 10/12-16
• Sato: 10/12-16
• Hirata: 10/12-16

Next meeting

• On 2020/10/9(Fri)