Agenda/Minutes of the VIS Meeting on 2020/2/7

2020/2/7 14:00 - 14:30

Zoom Meeting

Participants: Takahashi, Hirata, Sato, Ishizaki, Aso, Okutomi, Tanaka, Lucia

VIS Commissioning Task List

Post-O3 task list

Schedule afetr O3

Procurement list in 2019FY

Progress report

Type-A

Past week report

• klog#12824

Plan for coming weeks

Type B

Past week report

• OPLEV box:
  • I have verbally requested information about the box for the TM oplev to the CRY group but there's no response yet.
  • I got more information from Akutsu-san about the box Mirapro designed for the MN oplev.
  • I'm making a a more suitable design using Mirapro's ideas and implementing the features requested in the previous meeting.
• About SRM BF condition:
  • The keystone has a free range of ±130 um, presumably due to a screw that fell from upper stages which landed in the wrong place within the filer enclosure.
  • The current plan is to insert a small fibre optic camera (Ø3.9 mm) through one of the Ø5.2 mm holes at the base of the BF filter base.
• Yokozawa-san turned off some turbo pumps in the central room, which produced the temperature to decrease.
  • The temperaure change in turn produced a drift in the DC control signals of GAS filters; in the worse case for Type B the signal reached around -18,000 counts in the BF top filter.
  • Later Yokozawa-san turned off the cooler near the BS clean booth and the temperature recovered to 23.7 degrees (23.8 degrees requested for O3).

Plan for coming weeks

• I aim to finish the design of the SR top oplev box.

Type-Bp

Past week report

• IP address of the picomotor in PR3 was wrong.

Plan for coming weeks

OMMT & OSTM

Past week report

Plan for coming weeks

VIS electronics

Past week report

• Started investigation of LVDT-ACT coupling in the combiner circuit.
• The combiner and the DC cable are necessary.

Plan for coming weeks

Other site works

Safety

Discussion

Travel Plans

• Travel (Week of 2/10):
  • Takahashi:
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:
• Travel (Week of 2/17):
  • Takahashi:
  • Sato: 19-21(shift)
  • Hirata: 20-22(shift)
  • Shoda: 18-20(shift)
  • Fujii:
  • Tanaka:

Next meeting

On 2020/2/14(Fri)