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 (Takahashi)

Past week report

• The modification parts have been delivered.
• Pre-assembled the suspension with the modification parts.
• Checked the mirror gluing jig at the site. Since the dimensions of mirror is different from the IMC ones, it is necessary to modify some spacers.
• There are two stand-offs with sharp notch. No spare.

Plan for coming weeks

• Transport the suspension to Kamioka.

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:16-19

  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:
  • Terrence:

Next meeting

On 2019/7/12(Fri)