Agenda/Minutes of the VIS Meeting on 2019/7/5

2019/7/5 13:00 -

Zoom Meeting

Participants:

Progress report

Type-A (Takahashi)

Past week report

• Confirmed the LVDT polarities in Y-end (6/30).
• Installed the Type-A guardians (6/30).
• Measured the cryo-payload spectra (6/30).

• Aligned the TM/MN OpLevs in Y-front (7/2).

Plan for coming weeks

Type B (Mark) (Written by Fabian)

Past week report

• Fabian and Terrence went through the process of oplev diagonalization for the purposes of knowledge transfer and procedure documentation.
  • There were small corrections to the procedure.
  • Terrence wrote the oplev section of the Type B paper.
  • Fabian began writing a rough draft of the procedure.
• We went to the tunnel in order to improve the SR3 oplev air shield, which implied another round of diagonalization. The aim was to reduce the noise in the control loop after Izumi-san reported a peak at 1.4 Hz in the movement of the optic.
• With the agreement of the comissioning team we decided to move the position of two oplev QPDs. When the optic was aligned they were away from linear range.
  • The affected ones were the SR2 tilt QPD, which had to be moved up, and the SR3 tilt QPD, which had to be moved up and to the left.
  • We took note of the oplev to IM DC control actuation, off-loaded the actuation onto the test channels and temporarily modified the watchdof thresold to avoid tripping of the payload.

Plan for coming weeks

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM

Past week report

Plan for coming weeks

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 7/8):
  • Takahashi:
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:
  • Terrence:
• Travel (Week of 7/15):
  • Takahashi:
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:
  • Terrence:

Next meeting

On 2019/7/12(Fri)