Agenda/Minutes on 2021/2/12

Zoom Meeting

CRY+VIS Interface Meeting

13:30-

Participants:

Post O3 Upgrade portal

• Schedule for IX: Release is scheduled on 2/18.
• Schedule for IY: Disconnection is scheduled on 3/11.
• Schedule for EX: Connection is scheduled in the week of 3/15.
• Corrugate tube fixing jig: Re-measurement is planed in 2/26-3/1 at IYV.
• Commissioning in air:
• Commissioning in vacuum:
• Acceptance check: Cryo-payload in IX and Type-A tower in EY are on going.
• PF actuator: Dead line depends on the schedule of commissioning.
• Jig for FC painting: Delivered.

VIS Meeting

14:00-

Participants:

Progress report

VIS/General

Summary

Ikeda-san worked on following items;

1. He measured the length of the network cable (15956), and now is preparing to order all cables we need with DGS group.
2. He got message from manufacturer that it is difficult to operate the picomotor for long time more 24 hours. (15958). So he is now considering to request AEL group to make the circuit box that turns power on and off with BIO signal like the stepper motor circuit.
3. He made the new MEDM screen for stepper motor on MN stage which is developed by Nishimoto-kun. We can open the screen from [sitemap]/[STEPPINGMOTOR]/[CRY_OVERVIEW] (15965).

Klog entries

• 15737 We investigated the network connection. , satoru.ikeda

  • 15956 Comment, satoru.ikeda

• 15958 About Picomotor's 24-hour operation , satoru.ikeda

• 15965 Integration of Cryo Payload Phytron motor driver into MEDM , satoru.ikeda

• 15983 I posted this by mistake. , satoru.ikeda

VIS/EY

Summary

Setup of the F2 stage in EY: installation of suspension wire, cabling, calibration of LVDT, check of FR range, tuning

Klog entries

• 15950 Setup of F2 , ryutaro.takahashi

• 15982 Setup of F2 , ryutaro.takahashi

• Thursday 15993 Setup of F2 , ryutaro.takahashi

• 15959 Connection between F3 and F2 , naohisa.satou

• 15972 Cabling between F3 and F2 , naohisa.satou

VIS/IX

Summary

Connection of the cryo-payload in IX, mounted the geophones onto the IP in IX, and compressed the F0 blades in IX.

Klog entries

• 15968 Connection to cryo-payload , ryutaro.takahashi

  • 15974 Comment, ryutaro.takahashi

• 15968 Connection to cryo-payload , ryutaro.takahashi

• 15981 Setup of pre-isolator , ryutaro.takahashi

VIS/MCE

Summary

Akutsu-san found the optical lever light hits on the edge of the MCE mirror during his investigation about IMC ghost beams. We need to re-schedule to work on IMC suspension for this problem and also other issues reported in 15916. Please discuss it later.

Klog entries

• 15987 MCe oplev , tomotada.akutsu

VIS/PRM

Summary

(1) Miyo fixed the swapped cabling on the BF-damper for PRM with Nakagaki-san, and after that, the noise coupling of the transfer function at higher frequency is decreased to the same behavior of other PR suspensions (15994). By the way, the same noise coupling was reported in Type-A suspension 12678. Is it caused by the same error?

(2) Ikeda-san touched the picomotor of PRM for his first operation (15957) before measure the calibration factor between picomotor and OSEM.

Klog entries

• 9449 PRM glitch investigation: , koki.okutomi

  • 15960 Comment, kouseki.miyo

  • 15988 Comment , kouseki.miyo

  • Thursday 15994 Comment , kouseki.miyo

• 15957 Checking the operation of PRM's Picomotor PRM_BF and PRM_IM , satoru.ikeda

VIS/PR3

Summary

Ikeda-san tested the picomotor operation and measured rough calibration value for PR3-IM picomotor (15977). During the test for BF picomotor, it was stucked (15976). So we need open the top chamber to fix that.

Klog entries

• 15977 PR3 IM PITCH, ROLL, YAW's Picomotor is operated to measure the travel and drive range , satoru.ikeda

• 15976 Picomotor of PR3_BF_T(Motor2) got stuck , satoru.ikeda

  • 15979 Comment, satoru.ikeda

VIS/SR3

Albums

• BS remedying work after O3

• SR2 remedying work after O3

• SR3 remedying work after O3

• SRM remedying work after O3

SR3 ballast mass adjustment highlights

On top of Intermediate Mass

• We recovered the oplev in order to use is as a reference for pitch.

• Aim for the BF LVDT: 311 um per buoyancy correction.

• After locking the IRM we checked the IM was free to move.
• After we locked the payload and BF to the security structure, we removed the H1 OSEM flag and then the front and back panels of the IRM.

• In two steps we removed a total of 100 grams from the IM and got the BF LVDT to 308 um at the temperature of the moment.

• Once we finished the adjustment we assembled the IRM and put the OSEM flag back with magnet with the correct polarity.

• Despite we used the oplev as a reference, apparently we disturbed the pitch by 496 urad approximately. This is should be within picomotor range. Yet to be adjusted.

• We measured five IM transfer functions and the system looks very healthy. We didn't measure IM-V because the top filter is locked.

• We measured the position of the IM-P picomotor.

On top of Bottom Filter (klog yet to be written)

• F1 LVDT aim 416 um per buoyancy effect.

• From IM ballast mass adjustment we calculated how much mass we require for the BF: 2 * 45 grams.

• We quickly tested the calculation this morning with temporary ballast masses and got it to 412 um.

• On Monday we will put the masses properly and fix them.

Klog entries

• 15928 Oplev installation and alignment recovery. , fabian.arellano

  • 15953 Comment, fabian.arellano

• 15963 IM ballast mass adjustment , fabian.arellano

  • 15975 Comment, fabian.arellano

  • Thursday 15990 Comment , fabian.arellano

  • Thursday 15991 Comment , fabian.arellano

Electronics

????

Towards O4

• Type-B/Bp remedy work is on going.
• Installation of Type-A is on going in EY.
• Schedule.

  • Chart

• 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.

  • Inspection document (sample)

Safety

Discussion

• [Ikeda] How to rescue the stucked picomotor named BF-T for PR3. klog#15976

• [Miyo] When and who work on the IMC repairing? This work is not included in the VIS schedule.

  • Making of extension cables with the connector.
  • Fixing of stray wires on the pillar.
  • Fixing of the 22-pin Burndy cable to the connector.

• [Miyo] Please write klog entry as a comment if it is related work to other entry as Fabian did on klog#15963. If you do so, it is very helpful for future workers to find whether the work is done or not.

Travel Plans

The week from 2/15

• Takahashi: 2/15-19
• Sato: 2/15-19
• Hirata: 2/15-19
• Yano: 2/15-19

The week from 2/22

• Takahashi: 2/23-2/28
• Sato: 2/23-26
• Hirata: 2/23-26
• Yano: 2/23-26

Next meeting

• On 2020/2/19(Fri)