• KAGRA
• Subgroups
• VIS
• VISMinutes20181019

Clear message

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

• KAGRA/Subgroups/VIS/TypeB/ToDoBS

• KAGRA/Subgroups/VIS/TypeB/ToDoSR

• JGW-L1807779 Type B Schedule (SR)

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.
• Mirapro adjusted breadboard level in the vacuum 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)