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• VISMinutes20181214

Agenda/Minutes of the VIS Meeting on 2018/12/14

2018/12/14 13:30 - 15:10

Zoom Meeting

Participants: Mark, Takahashi, Enzo, Sato, Aso, Hirata, Fabian, Ohishi, Eleonora, Fujii, Lucia

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-C: (XLSX)

Type-A (Takahashi)

Past week report

[Y-front]

• Replaced the yaw FR.
• Mounted the ACCs onto the PI.
• Released the IP. Closed the chamber.

[Y-end]

• Replaced the yaw FR.
• Tuned the TF. The TF has bi-stable modes.
• Released the IP. Closed the chamber.

[X-front]

• Established the inertial damping of IP using ACCs with LVDTs.

Plan for coming weeks

• Adjustment of the TF in Y-end.
• Replacement of the yaw FR for X-front in Jan. 10-11.

Type B (Mark)

Report for week of 12/10

• SRM
  • We locked the suspension and craned it into the tank. This is the last Type B tank installation!
  • While inspecting the O-ring between the service ring and the lower section of the tank, Hirata-san found a small nick, so he replaced it. (This will hopefully be the last time that flange is closed, so it needs to be left ready for Mirapro to tighten.)
  • Hirata-san and Fabian removed the First Contact, but found that a tiny piece was left behind. With advice from Hirose-san, they managed to remove it via several rounds of dabbing with an acetone-soaked lens tissue.
  • They removed the IM-RM safety bar, unlocked the lower half of the suspension, and got it reasonably well aligned by eye.
  • They moved the vacuum feedthroughs and in-air cabling over, and reconnected nearly all the electronics. (The in-air cabling will need some tidying later.)
• SR2
  • Enzo worked on diagonalizing the IP and modeling of the whole suspension. He created Foton filters representing the response of the system in slots FM6-8 of the various filter banks.
  • Enzo and Mark set up the the SR2 OL. We may need to steal the LED back temporarily to do pitch setting on SRM, but we can take some interesting TFs on SR2 over the weekend.
• SR3
  • Enzo configured a new stepper driver for SR3_IP and returned the one that had been borrowed from SRM. (The original SR3_IP had been used to replace a water-damaged unit on the BS.)
• Etc
  • Mark got three more MPCDs (M = "medium" or "modified") from AEL and moved coil drivers around until all Type B suspensions had a driver in every position, with MPCDs for IM-H and HPCDs everywhere else. He returned the unused LPCDs.

  • Mark did an inventory of all the Type B electronics and got the various JGW Doc electronic items lists up to date - see E1707276. This included opening all the LVDT drivers to check that they had the original cards - BS, SR3 and SRM did, but SR2 had both input cards new. We let AEL know.

  • Hirata-san helped Furuta-san with floor repair.
  • Fabian changed the PR3 thermometer battery.
  • Mirapro installed a bellows on the -Y side of SR3.

To-Do Lists, Schedule

• KAGRA/Subgroups/VIS/TypeB/ToDoBS

• KAGRA/Subgroups/VIS/TypeB/ToDoSR

• JGW-L1807779 Type B Schedule (SR)

Plan for week of 12/17

• Final alignment of SRM payload, plus BF and SF GAS.
• (Time permitting) unlocking/centering/tuning of IP.
• Installation of Enomoto-kun's beam target on SRM (if available).
• Installation/testing of F0 steppers on SR2, SR3, SRM, and (hopefully) final vertical height adjustment.
• Installation of viewports on SRM.

Plan for week of 12/24

• Most of team on holidays - no Kamioka work.

Vacation/Etc Info

• Mark: 12/24 - 1/4.
• Hirata-san: 12/24 - 1/4.
• Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

VIS electronics (Tanaka)

Past week report

Plan for coming weeks

Other site works

Safety

• Incidents:
• Foreseen risks
  • Type-A:
  • Type-B:

Discussion

Type-A works

• Y-End TF is in a bi-stable mode.
  • We may need to reduce the compression
  • Try this in the next week
• Y-Front ACC: One of them has a low gain
  • Will check it on Dec. 26-27
• Y-Front IP has a bit high resonant frequency (100mHz)
  • Will tune it on Dec. 26-27
• Y-End: BF damper LVDTs need calibration again.
  • We will do this on Jan 21 and 22 (Fujii, Takahashi)

Type-B

• Some cables for SRM OSEM need to be found or repaired
• We will order new cables

Type-Bp

• One of the BF damper LVDTs of PRM shows glitches.
• It looks like sharp electric glitches.
• Will try to swap the driver card.

OSTM repair

• A magnet came off of the OSTM mirror
• Re-gluing on going
• Will suspend the mirror and install on Dec 17 and 18 (Ohishi, Sato)

Vacuum Monitoring Shift

• IYC pump down: on going
• IYC vent: 12/19(Wed) - 21(Fri) Fujii, Fabian, Lucia (19-20)
• EXC/IXC vent: 1/7(Mon) - 9(Wed) Fabian, Fujii, Aso
• EYC pump down: 1/10(Thu) Fabian, Fujii, Aso
• EYC vent: 1/17(Thu) - 1/19(Sat), Lucia, Fabian

Thesis defence practice

• Kozu-kun and Arai-kun: after the next VIS meeting (12/21)

Travel Plans

• Travel (Week of 12/17):
  • Takahashi: 19-20
  • Okutomi:
  • Sato: 17-18
  • Lucia:
  • Fabian:
  • Mark: 17-21
  • Hirata: 17-21
  • Enzo: 17-21
  • Shoda:
  • Ohishi:
  • Fujii: 19-21
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 12/24):
  • Takahashi: 26-27
  • Okutomi:
  • Sato:
  • Lucia:
  • Fabian: 25-28
  • Mark:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii: 25-28
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):

Next meeting

On 2018/12/21(Fri)