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 *OMC was installed by TiTech people.  *OMC was installed by TITech people.

Agenda/Minutes of the VIS Meeting on 2018/10/19

2018/10/19 13:30 -

Zoom Meeting

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-C: (XLSX)

Type-A (Takahashi)

Past week report

[X-front]

  • Corrected the tilt of IP base by jack up/down of the corn bellows.
  • Adjusted the position of IP by the stepping motors.
  • Aligned the TM by the yaw picomoter in the BF.

[X-end]

  • Corrected the tilt of IP base by jack up/down of the corn bellows.
  • It was difficult to adjust the position of IP by the stepping motors due to the tight stopper setting.
  • Vented the EXV chamber and open the top chamber.
  • Released the stopper for IP more.
  • Adjusted the position of IP by hand/stepping motors.
  • Aligned the TM by the yaw picomoter in the BF.
  • Closed the top chamber and started the evacuation.
  • Followed the drift of IP position by the stepping motors during the evacuation.

[Y-front]

  • Investigated the 70Hz peak in the spectrum of IP LVDTs. Changed the modulation frequency from 10,000Hz to 10,003Hz.
  • Designing the yaw stepping motor mechanism. We need to procure 4 more motors.

Plan for coming weeks

[Y-front]

  • Replacement of the FR parts for BF. (10/22, 23)

[Y-end]

  • Assembly of the geophone pods and installation. (10/24)

Type B (Mark)

Report for week of 10/15

SRM
  • We received the fourth feedthrough we had been waiting for and installed it on the AF.
  • Fabian added the cables between the FE computer and the ADC/DAC boxes, and we checked that we were getting IO in the real-time model.
  • Fabian and Enzo connected up the Sat Amps.
  • Fabian double-checked the optic pitch, got the IRM nicely aligned to the IM, cabled IM OSEMs V1, V2, V3 and H1, and adjusted those OSEMs in/out to midrange.
  • Hirata-san set the compression on the F0 to 30 mm and measured the height and frequency as a function of load. He then fixed a loose screw on one of the blade tips and repeated the measurement. The frequency was fairly constant at around 0.5, which will do. He did a mass budget and chose a F1 CuBe spring. We may do a tiny bit more compression if the frequency degrades, and/or choose an even stronger spring if the load capacity is not enough.

  • Hirata-san took apart and reassembled one of the LBB blade units, which had a badly seated blade.
  • Hirata-san put cable clamps on the SF and on the PI. We are very short on the PEEK clamp pieces, so he scavenged some from SR2.
  • We added a new LAN hub for SRM, and configured two stepper drivers as SRM_IP and SRM_GAS.
  • Late in the week we received extra Type 3-4 cables (thanks to Sato-san for expediting) and were able to cable IM OSEMs H2 and H3, and the BF LVDT.
  • Enzo made a new batch of feedthrough adapters.

SR2
  • We finalized the geophone cabling and reinstalled the geophones.
  • We received the new arc weights, and used some of them to install a basic allotment of 6 38-mm weights on SR3 per the CAD. We then added two extra 19-mm arc weights for tuning and got a good IP frequency of 0.133 Hz.
  • Apart from the F0 yaw stepper issue and the OL, the SR2 is now more-or-less complete and adjusted mechanically, and just needs software work (control loops etc). We will however have to borrow one of the geophones at some point to do a huddle test with the final batch of new geophones (including those for SRM). Terrence can set up the OL in the week of 10/29.

Plan for week of 10/22

  • Friday is NAOJ Open Day Prep - no Kamioka work.
  • Mark, Hirata-san and Fabian at Kamioka Mon-Thu.
  • Enzo at Kamioka Tue-Thu.

SR2
  • Do a measurement of how much torque is required on the F0 keystone to move the system in yaw. (This will help Sato-san choose a suitable stepper driver for the new design.)
  • Continue shakedown.
  • Gather parts for the OL (with help from Simon).

SRM
  • Scavenge HPCDs from SR2 and SR3 (currently we only have one for SRM) and organize to get LPCDs modified.
  • Suspend/weigh/balance the BF/... section.
  • Build up the AF and SS to the SF level.
  • Install the SF.

Plan for week of 10/29

  • Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri.

SR2
  • Set up OL.

SRM
  • Continue assembly.

To-Do Lists, Schedule

Vacation/Visitor Info

  • Terrence: 10/29-11/2 at Kamioka.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

  • Delivered mechanical parts were almost assembled.
  • Did cabling from rack to satellite box, and inside chamber.
  • OMC was installed by TITech people.

Plan for coming weeks

  • glue magnets and standoff of OMMT1.
  • cabling (Make flipper, and pico-motor cables)
  • hang OMMT1 mirror from IM.

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 10/22):
    • Takahashi:
    • Okutomi:
    • Sato:
    • Lucia:
    • Fabian:
    • Mark:
    • Hirata:
    • Enzo:
    • Shoda:
    • Ohishi:
    • Fujii:
    • Tanioka:
    • Tanaka:
    • Kozu (ICRR):
    • Arai (ICRR):
  • Travel (Week of 10/29):
    • Takahashi:
    • Okutomi:
    • Sato:
    • Lucia:
    • Fabian:
    • Mark:
    • Hirata:
    • Enzo:
    • Shoda:
    • Ohishi:
    • Fujii:
    • Tanioka:
    • Tanaka:
    • Kozu (ICRR):
    • Arai (ICRR):

Next meeting

On 2018/10/26(Fri)

KAGRA/Subgroups/VIS/VISMinutes20181019 (last edited 2018-10-19 15:10:16 by YoichiAso)