Agenda/Minutes of the VIS Meeting on 2018/9/14

2018/9/14 13:30 - 14:35

Zoom Meeting

Participants: Hirata, Aso, Ohishi, Tanaka, Fabian, Lucia, Fujii, Sato, Panwei, Akutsu

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

• The keystone of BF had gone to the lower limit. The FR did not work. Though we can listen to the sound of stepping motor, it is unknown whether the motor is rotating.
• The keystone of F3 had gone to the lower limit too. Adjusted the height of keystone by the FR.

[Y-front]

• Recovered the analog electronics from the power outage.
• Corrected the tilt of ACCs. Moved the NIM chassis for ACC drivers to the side of the rack.

[X-end]

• Opened 4 feedthrough flanges. Disconnected the in-vacuum connectors from the feedthroughs.
• Undid the cables from the PI.
• Inserted the wire holder to the suspension wires.
• Dismounted the geophone pods.

Plan for coming weeks

[X-front]

• Recovery of the FR in the BF.

[X-end]

• Replacement of the actuator coil in the TF.

Type B (Mark)

Report for week of 9/10

• We finish the invacuum and in air cabling for SR2, but the in-vacuum cables for Geophones and F0 Yaw stepper motor are just temporary and will be replaced later once the suspension is inside the tank.
• We checked all the motors:
  • IM picos, BF picos.
  • BF Stepper (Fishing rod), SF Stepper (SF Fishing rod), F0 Stepper (F0 Fishing rod).
  • IP Steppers (Horizontal fishing rods).
• We use the Steppers to set to nominal height the BF and SF, but for the SF we culd not move it too much and it is still too low.
• We tried to check the TM actuators but there is a problem with the MEDM screens that we need to fix next week.
• we change the LPCD for HPCD in SR2 rack
• We measured TFs of the GAS filters and the 6 DoF of the IM and it seems to be healthy.
• We set up the temporary oplev for SR2.
• We did a lot of cabling in the SR2 pre-isolator.
• The cabling is likely somewhat different to that of SR3 because we found new ways of giving more slack to cables: existing cables for the three geophones, F0 LVDT and yaw stepper motor were found to be too short to accommodate them in the available places with enough slack, so we asked Sato-san to buy longer cables.
• We found the BF picomotor driver is not working. We had to use the IM driver for the test.
• Enzo measured transfer functions and updated the SUMCOM models.
• Panwei measured the sensitivities of all six OSEMs which will be used in SRM. The units still have to be changed to m\rtHz.
• We balanced the SF and adjusted the F0 keystone at the (new) nominal position. We had to move the F0 fishing rod one quarter way up to be able to achieve the SF balance. We still have to measure by how much we can lift the keystone in this configuration.
• We found some arch-weights in the mode cleaner corridor and we wonder whether we can use them to tune the IP’s.
• ...

Plan for coming weeks

• Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.
• Enzo on vacation.

SR2

• Crane SR2 into tank.
• Move SR2 in-air cables.
• Remove First Contact.
• Unlock and realign suspension

SRM

• Set pitch of SRM and RM, tighten clamps, remove winch system.
• Weigh IM/... section.
• Build up SS to BF level.
• Add BF.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

• Finally have ordered remaining 29 kinds of mechanical parts.
• Making a screw list.

Plan for coming weeks

• Order screws, nuts and washers.

VIS electronics (Tanaka)

Past week report

• JGW-S1807740
  • INA103(Secondary coil input stage for Ch1) was exchanged.

  • And I received a report that there is an imbalance as a symptom and confirmed the phase shift circuit.-->But no problem.Moved to Kamioka at 09/13/2018 Inspection is completed(And INA103 changed(for ch1).

    • JGW-E1808991(PDF)

Plan for coming weeks

Other site works

Safety

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

Discussion

• SRM composite mirror assembly with Hirose-san
  • Sometime between 25 and 27 of Sept.
• Tally of LVDT drivers
  • We need to make a list of LVDT drivers

Travel Plans

• Travel (Week of 9/17):
  • Takahashi: 18-21
  • Okutomi:
  • Sato: 18-21
  • Lucia: 18-21
  • Fabian: 18-21
  • Mark: 18-21
  • Hirata: 18-21
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii: 18
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 9/24):
  • Takahashi: 27-28
  • Okutomi:
  • Sato: 25-28
  • Lucia: 25-28
  • Fabian: 25-28
  • Mark: 25-28
  • Hirata: 25-28
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii: 25-28
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):

Next meeting

On 2018/9/21(Fri)