Agenda/Minutes of the VIS Meeting on 2018/8/10

2018/8/10 13:30 - 14:38

Zoom Meeting

Participants: Mark, Takahashi, Enzo, Aso, Ohishi, Sato, Fujii, Fabian, Okutomi, Hirata, Lucia, Panwei, Terrence, Kozu, Hatoya, Enzo

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[Y-front]

• Put the ballast mass of 15.1kg on the keystone. The height of keystone was 10.0mm.
• Calibrated the LVDT.
• Checked the relative height of the F1 damper.
• Dismounted the pre-isolaotor and the bridge frame from the foothold.
• Implemented the cables between the F1 and the PI.
• Lifted down the EQ stop into the corrugate tube. The top ring sit on the frame lock.
• Adjusted the rotational direction and the center position of the EQ stop.
• Installed the PI into the top chamber.
• Hooked the wires to the receptacles. The filters were suspended from the TF.
• Removed the wire clamp.
• Implemented the cables from the PI to the feed through flanges.
• Started the tuning of TF. Digital output for the coil driver did not work.

[X-front]

• Released the BF.

Plan for coming weeks

• Setting of the pre-isolator in Y-front (tuning of TF, calibration of LVDT, tuning of IP).
• Setting of the pre-isolator in X-front (additional FR, yaw actuator).

Type B (Mark)

Report for week of 8/6

SR3

• We undid the accidental misalignment of the SR3. We also switched off the BF GAS offset we had been using, let the IM rise until near zero on the BF LVDT, and adjusted the IM vertical OSEMs back to mid-range.
• We closed control loops for the SR3 GAS filters.
• Terrence set up the LED and TILT QPD for the final OL, and did a new calibration.

SR2

• We installed the SR2 SF damper magnet ring but found that the magnet pattern didn't match the Cu segments due to a different in the caps between SR3 and SR2. We raised the ring but left it suspended, clamped the template to the underside and rearranged the magnets.
• We did a vertical height budget of the SR2. It turns out to have a very similar issue to the SR3: the chain is about 5 mm longer than the CAD, with about 3 mm of that between the SF and BF. We decided to do the same fix and operate with the F0 keystone 5 mm higher. We chose an total amount of ballast to give that keystone height and secured most of it to the SF, keeping a reserve for cables and the yaw stepper.
• We routed most (all?) of the SF/... cabling up to the PI.

SRM

• We moved the SRM assembly frame into its final position, reset it to the initial configuration, double-checked the heights of the crossbars, and lowered the optical table by 3 mm (to give margin for the optic to rise during hanging, which we had kept forgetting to do). We cleaned it up with the airgun and wet-wipes. We installed the IM ring and IM.
• We assembled the SRM metal mass. Hirata-san made a jig from a plate with 4 screws which could safely hold the delicate front Sol-Black-coated ring upside down while the rest of the components were mounted on it.
• We moved the metal mass to the mirror box and added the prisms and magnet standoffs. We applied the EP30 on Friday morning, but probably won't be able to check the result until after Obon.

Plan for week of 8/13

• KAGRA closed Mon, Tue.
• Mark on vacation Mon-Thu, then Mitaka on Friday.
• Enzo, Fabian, Terrence, Panwei, Rikako at Kamioka Wed-Fri.
• Hirata-san on vacation all week.
• Fujii-kun to help part-time with crane work and/or the IP tuning.
• Diagonalization of new OL.
• TFs with new OL.
• Test of SF damper ring.
• Controls work.
• Tune SR3 IP.

Plan for week of 8/20

• Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
• Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Thu, then f2f.
• Kozu-kun works at Mozumi Mon.

SR3

• Hook LBB, add ballast mass.
• Tune IP.

SR2

• Adjust ballast/trim mass, with reserve for yaw stepper.
• Cable/test PI items (LVDTs, steppers, geophones).
• Set damper height.
• Add arc weights, adjust IP.
• Stage LBB damper rings in tank.

SRM

• Check gluing result - redo if necessary.
• Assemble RM.
• Add IM ballast masses (we forgot this before).
• Get parts from AOL and set up new pitch-setting OL.
• Hang metal mass.
• Hang RM.

To-Do Lists, Schedule

• KAGRA/Subgroups/VIS/TypeB/ToDoBS

• KAGRA/Subgroups/VIS/TypeB/ToDoSR

• JGW-L1807779 Type B Schedule (SR)

Vacation Info

• Mark: 8/13-16.
• Hirata-san: 8/13-17
• 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

• Have ordered 34 kinds of OMMT/OSTM suspension mechanical parts. Will be delivered by Oct. 6th.

Plan for coming weeks

• Order remaining 26 kinds of parts.

VIS electronics (Tanaka)

Past week report

Plan for coming weeks

Other site works

• Sept 3 (Mon): Crane inspection 9:00 - 12:00
• Sept 5 (Mon): Crane inspection 9:00 - 13:00
• Sept 10(Mon): Planned power outage

Safety

• Incidents: no incident
• Foreseen risks
  • Type-A: Crane work
  • Type-B: Crane work. Transport heavy arc weights

Discussion

• Satellite box modification

  • Shimode-san's report

  • The chassis is not connected to the electric ground.
  • AEL is planning to fix the connection
  • OSEM read out path has a strange bump in the transfer function between 10Hz and 100Hz.
• DAC channel rearrangement

  • https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8689

  • VIS agrees to this proposal
• SRM metal mirror

  • https://photos.app.goo.gl/zpR4DuDpdjSXZkKaA

  • Hirata-san will design jigs to avoid the container to touch the black surface
  • Arrange with Hirose-san on how to test the SRM-M in Caltech

Travel Plans

• Travel (Week of 8/13):
  • Takahashi: 15-17
  • Okutomi:
  • Sato:
  • Lucia: 15-17
  • Ishizaki:
  • Mark:
  • Hirata:
  • Enzo: 15-17
  • Terrence: 15-17
  • Shoda:
  • Ohishi:
  • Fujii: 15-17
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR): 15-16
  • Arai (ICRR):
• Travel (Week of 8/20):
  • Takahashi: 20 - 24
  • Okutomi:
  • Sato: 20 - 24
  • Lucia: 20 - 24
  • Ishizaki:
  • Mark: 20 - 24
  • Hirata: 20 - 24
  • Enzo: 20 - 24
  • Terrence: 20 - 23
  • Shoda:
  • Ohishi:
  • Fujii: 20 - 24
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR): 20 - 24
  • Arai (ICRR):

Next meeting

On 2018/8/31(Fri)