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• VISMinutes20180928

Agenda/Minutes of the VIS Meeting on 2018/9/28

2018/9/28 13:30 - 15:00

Zoom Meeting

Participants: Mark, Hirata, Panwei, Koz, Aso, Fabian, Lucia, Okutomi, Arai, Sato, Takahashi, Fujii

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-C: (XLSX)

Type-A (Takahashi)

Past week report

[Y-front]

• Tested the new yaw rotation mechanism. The bellows can be expanded/contracted by 3~4mm without load. The torque of the Phytron motor was too small to rotate the bellows with load.
• Tested the other setup using the AML motor. It could rotate in the full range of bellows (8mm) with load.
• Assembling the geophone pods.
• Making the in-vacuum cables for the geophone pod.
• Connected the signals of ACCs to the digital system.

[X-end]

• Closed the four feedthroughs with screws.
• Released the IP and centered it.
• Adjusted the height of BF again.
• Closed the top chamber and the cross tube,
• Repaired the broken in-vacuum cables for the actuator of IP-H2.

Plan for coming weeks

[Y-end]

• Dismount of the DP (10/1).
• Replace of the cables for CP (10/2).
• Assembly of the geophone pods (10/3).

[X-front]

• Repair of the FR in the BF (10/4-5).

Type B (Mark)

Report for week of 9/24

• Monday 9/24 was a holiday (Autumn Equinox).

SR2

• We moved all the SR2 feedthrough and in-vacuum and in-air cables.
• We tested all the OSEMs and most of the LVDTs. We still need to run power to the pico drivers, and test them and the steppers.
• We unlocked and mostly realigned the suspension. The IM is sitting lower than before but can be brought up to nominal height with BF GAS offset, without any signs of anything touching. The IM also has a moderately large pitch (2.8 mrad according to the OSEMs, about 1 mrad according to the OL) and some roll, which we expect to be able to correct with some pico adjustment. The horizontal IM OSEMs are well-centered (so there is no yaw misalignment).

SRM

• We made another attempt to set the pitch of the SRM, but weren't satisfied with how close we were able to get (target 20 mm low, achieved 23 mm), so we didn't tighten the clamps or continue to setting the pitch of the RM.

Plan for week of 10/1

• Mark, Hirata-san, Fabian, Panwei at Kamioka Mon-Fri.

SRM

• Set pitch of SRM and RM, tighten clamps, remove winch system.
• Weigh IM/... section.
• Build up SS to BF level.
• Add BF.
• Suspend IM and tweak height/balance.
• Cable/test BF.
• Install IRM.
• Install/cable/test IM OSEMs.

Plan for week of 10/8

• Monday 10/8 is Sports Day.
• Enzo returns Tuesday 10/9.
• Mark and Terrence (plus TBD) at Kamioka Mon-Fri.
• Enzo, Hirata-san, Fabian and Panwei at Kamioka Tue-Fri.

SR2/SR3

• Terrence to set up LEN half of SR3 OL and, time permitting, TILT and LEN for SR2.

SRM

• Continue installation.

Type-Bp (Shoda)

Past week report

• PR2 and PR3 vertical transfer functions show only one peak (two peaks are expected).
• Arai, Fujii and Aso are investigating the cause of the problem
• We may open the chamber from Oct. 2nd

Plan for coming weeks

• Oct. 1st: Move the keystone height by FR (Fujii)
• Oct. 2nd: Open the chamber and visually check if something is touching the suspension (Aso, Fujii)

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

Travel Plans

• Travel (Week of 10/1):
  • Takahashi: 1-5
  • Okutomi:
  • Sato: 1-5
  • Lucia: 1-5
  • Fabian: 1-5
  • Mark: 1-5
  • Hirata: 1-5
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii: 2-5
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
  • Panwei: 1-5
• Travel (Week of 10/8):
  • Takahashi: 9-12
  • Okutomi:
  • Sato: 9-12
  • Lucia: 9-12
  • Fabian: 9-12
  • Mark: 8-12
  • Hirata: 9-12
  • Enzo: 9-12
  • Shoda:
  • Ohishi:
  • Fujii: 9-12
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
  • Terrenec: 8-12

Next meeting

On 2018/10/12(Fri)