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• VISMinutes20180727

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Agenda/Minutes of the VIS Meeting on 2018/7/27

2018/7/27 13:30 -

Zoom Meeting

Participants: Mark, Takahashi, Ohishi, Pena, Sato, Enzo, Lutia, Pan, Tellence, Fujii, Hashimoto, Panwei, Ishizaki, Hirata, Tanioka, Shoda, Okutomi, Akutsu, Eleonora, Tanaka

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[Y-front]

• Implemented the cabling in the F1.
• Mounted the F1 on the end plate. The filter chain was suspended from the F1.
• Calibrated the LVDT in the F1.
• Implemented the cabling between the F1 and the F2.
• Tuned the F1. Initially the proper frequency was 0.57Hz.
• Added the compression to 8 blades by 0.5mm, The F1 went to the bi-stable.
• Decompressed 4 blades. The proper frequency became 0.44Hz.
• Closed the cup and suspended the F1 by crane. The keystone went to the lower limit.
• Replaced the blades for the FR from the F2 type to F1 type.
• Finally the proper frequency became 0.35Hz (corresponding to the tuning frequency of 0.22Hz) with the cup.
• Checked the FR range. The FR can cover the full range of keystone.
• Implemented the cabling around the F1.
• Found that the primary coil was touching to the secondary coil in the F2. It was repaired.
• Lifted down the EQ stop into the corrugate tube. The end plate for F1 sit on the frame lock.

[X-front]

• Attached the additional FR on the TF.
• Adjusted the height of keyston in the TF.

Plan for coming weeks

• Setting of the pre-isolator.
• Calibration of the LVDTs for BF damper.

Type B (Mark)

Report for week of 7/23

• We finished adding cable clamps to the SR2 PI and SF.
• We craned in the SR2 PI and installed the PI-SF rod. As expected, there was not quite enough load capacity for even a 2 Cu-segment SF.

• We changed the CuBe spring on the SR2 PI from an F2 type to an F1 and got about an extra 2 kg, which is plenty for 2 Cu segments.

• We moved the feedthroughs from the SR3 assembly frame to the SR3 tank. Mirapro then moved the assembly frame to the SRM area. Mirapro also moved the duct on the +Y side of the SR3 tank to give us access to that side.
• We laid a new set of SR3 in-air cables running directly to the tank. (We will repurpose the original set for SRM.)
• We reconnected the SR3 cables on both sides of the feedthroughs. We had to adjust the routing of the in-vacuum ones several times to stop them touching the tank, but we finally found a good solution.
• With help from Ohishi-san we removed the First Contact and then unlocked the whole suspension by stages. We need to check the optic pitch and do a little more mechanical adjustment but we were able to take TFs and implement IM and GAS control filters.
• Hirata-san and Fujii-kun received most of the SRM metal mass parts, did inventory and practiced some of the key steps in the assembly, especially inserting the Sol-Black coated parts without touching the delicate surfaces.
• Mark did inventory of the BIO stuff for the WD and of the OL parts.

Plan for week of 7/30

• Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
• Kozu-kun works at Mozumi Mon, Fri, and Thu afternoon.

SR3

• Finalize optic pitch, OSEM alignment.
• Hook LBB, add ballast mass, set up temporary OL (horizontal beam, pitch/yaw only).
• Identify/acquire items required for final OL (steering mirrors, second QPD, lens, collimator).

SR2

• Fix issue with PI/SS/chain alignment.
• Put magnets on SR damper ring (2 Cu segment pattern).
• Remove PI-SF rod temporarily, install Cu segments and damper ring.
• Do vertical height budget; choose optimum F0 keystone height.
• Add estimated final ballast mass.
• Do PI cable routing.
• Adjust ballast/trim mass, with reserve for cables.

SRM

• Set up filter tuning area.
• Tune F0 for SRM.
• Add LBB blade units, cable clamps etc.
• Check PI coil connections, IP LVDT magnets.

To-Do Lists, Schedule

• KAGRA/Subgroups/VIS/TypeB/ToDoBS

• KAGRA/Subgroups/VIS/TypeB/ToDoSR

• JGW-L1807779 Type B Schedule (SR)

Vacation Info

• Terrence: 8/24-26 f2f, then returns to Hong Kong.
• Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.

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

• Sept 10(Mon): Planned power outage

Safety

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

Discussion

Horizontal position of cryo-payload

• AOS group worry about the relative position of the recoil mass (RM) and the WAB.

(https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8538) When we set the horizontal position of cryo-payload finally, we need to adjust the position of IP by the stepping motors so as to keep the nominal relative position of the RM and the WAB.

Travel Plans

• Travel (Week of 7/30):
  • Takahashi:
  • Okutomi:
  • Sato: 7/30-8/3
  • Lucia:
  • Ishizaki:
  • Mark: 7/30-8/3
  • Hirata: 7/30-8/3
  • Enzo: 7/30-8/3
  • Panwei:
  • Terrence:
  • Shoda:
  • Ohishi:
  • Fujii: 8/1-8/3
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 8/6):
  • Takahashi: 8/6-10
  • Okutomi:
  • Sato: 8/6-10
  • Lucia:
  • Ishizaki:
  • Mark: 8/6-10
  • Hirata: 8/6-10
  • Enzo: 8/6-10
  • Terrence:
  • Panwei:
  • Shoda:
  • Ohishi:
  • Fujii: 8/6-10
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):