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• VISMinutes20180706

Agenda/Minutes of the VIS Meeting on 2018/7/6

2018/7/6 15:00 - 15:54

Zoom Meeting

Participants: Lucia, Tanaka, Eleonora, Satou, Mark, Eleonora, Takahashi, Hirata, Tanioka, Okutomi, Ishizaki, Enzo, Fujii, Shoda

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[Y-front]

• Tested the additional FR blade using temporal parts. The height of keystone was lifted up to 67mm.
• Cabled between the F2 and F3.
• Suspended the F3 from the F2 and checked the behavior of F3/BF.
• Transported the cross tubes for the feedthroughs from Y-end and attached them onto the top chamber.
• Installed the LAN cables for the stepping motor drivers through the corrugate tube.
• Set the some analog drivers on the rack and cabled them to the digital front-end.
• Embedded the additional FR using the F2 blade. About 3kg was necessary as additional mass to obtain the optimal height.
• Changed the additional FR blade to the F3 one. The height was 67mm without any additional masses.

Plan for coming weeks

• Setting of the F2.

Target for the next week

• Finish the F2 stage

Type B (Mark)

Report for week of 7/2

• We double-checked the bounce frequency and it was indeed around 0.5 Hz with the CuBe auxiliary spring installed.

• We prepared (but did not yet install) 6 arc weights for tuning the IP.
• We unlocked the security structure from the assembly frame, and raised the whole system on the top jacks. We then unlocked the IP and adjusted the leveling so the IP was centered. We then had to loosen two of the poles at the top level of the security structure to make it vertical again, because it turns out that the jack receptacles (which also serve as the IP leg bases) are welded at very uneven depths in the bottom surface of the PI, so the IP and the bottom surface can't be level at once.
• We debugged an issue with the height of the payload. It turns out that due to a buildup of errors (especially an extra 3 mm between the SF and BF), the payload is some 5-6 mm low with the F0 keystone at CAD height. Since the frequency is roughly independent of height around 0.5 Hz, we decided to go with a higher F0 keystone.
• Enzo and Eleonora routed all the SF/... cables up to the PI.
• We found we needed 4.7 kg of extra mass to get the desired keystone height, so we decided to put the third Cu segment (3.3 kg) back on, purely as ballast.
• We put some extra small masses on the SF cap to level it. The suspension is now fully ballasted and trimmed except for 1 Promec mass (455 g) standing in for the new PI yaw stepper motor assembly (estimated 330 g) which is yet to arrive.
• We took all the SR sat amps back to Mozumi to get new capacitors installed, and grabbed three spares for use while that is being done.
• We investigated and documented Tanaka-san's watchdog for the BS, to see if the BIO Converter chassis that it uses could also drive reset lines for stepper motor driver boxes.
• Hirata-san and Terrence characterized the last 4 F0 blades.

• Hirata-san and Terrence installed blades in the top filter for SR2 and tuned it to 0.5 Hz over three rounds of compression. They added the vertical FR and CuBe auxiliary spring, and frequency was still 0.5 Hz, at least at one height value, and there was 6 kg more load capacity. They still need to measure the frequency at a few more mass/height values.

Plan for week of 7/9

• Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.

Main Sequence

• Check/restore alignment of payload, especially optic pitch.
• Install and cable geophones.
• Install arc weights.
• Tune IP.
• Install, cable PI yaw stepper.
• Make three in-air stepper splitter cables for SR2, SR3 and SRM.
• Calibrate PI LVDTs and FRs.
• Cabling, testing, TFs.

F0/LBB Stuff

• Finalize PI #1 for SR2; crane into SR2 cleanbooth.
• Remove SR3 tank lid, crane LBB rings to top of lower half of the tank, clamp in position.
• Set tank jacks to nominal height.
• Clear space for PI #2 (SRM) work.

Plan for week of 7/16

• Monday 7/16 is Sea Day.
• Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Tue-Fri.

Main Sequence

• Lock suspension.
• Crane into tank.
• Unlock suspension.
• Rearrange cables.
• Test.

F0/LBB Stuff

• Install correct IP in PI #2.
• Crane PI #2 to second floor.
• Rebuild top filter of PI #2.

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.

Target for the next week

• Make everything ready for craning in the SR3 into the tank in the next next week

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

• Reassembly IMMT2

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: Crane work
  • Type-B: Crane work and working with blades

Discussion

• SR satellite amplifier modification
  • We will wait for AEL to make modification

Travel Plans

• Travel (Week of 7/9):
  • Takahashi: 9 - 13
  • Okutomi:
  • Sato: 9 - 13
  • Lucia: 9 - 13
  • Ishizaki:
  • Mark: 9 - 13
  • Hirata: 9 - 13
  • Enzo: 9 - 13
  • Terrence: 9 - 13
  • Shoda:
  • Ohishi:
  • Fujii: 10 - 13
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR): 9 - 13
  • Arai (ICRR):
• Travel (Week of 7/16):
  • Takahashi: 17 - 20
  • Okutomi:
  • Sato: 17 - 20
  • Lucia: 17 - 20
  • Ishizaki:
  • Mark: 17 - 20
  • Hirata: 17 - 20
  • Enzo: 17 - 20
  • Terrence: 17 - 20
  • Shoda:
  • Ohishi:
  • Fujii: 17 - 20
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR): 17 - 20
  • Arai (ICRR):

Next meeting

On 2018/7/13(Fri)