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 * Briefly checked the effect of the wrongly directed magnets on PRM IM.
  * The initial estimation shows the order of 10^5 margin from the requirement with the 20 % of unbalance of the magnets. It should be OK even if the two magnets on the one flag was in the same direction.

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)

Report for the week 7/1 (Written by Fabian)

  • 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.
  • With the agreement of the comissioning team we decided to move the position of all of oplev QPDs. When the optics were aligned they were away from linear range.
    • Although the badly affected channels were only three, we decided to adjust all of them.
    • The procedure is described in klog entry 9411.

    • In order to keep the aligmment information, we took note of the IM DC control signal necessary to achive the alignment and and off-loaded the actuation onto the TEST channels while the oplev was adjusted with the control system off.
    • In the case of SRM the oplev was to the point of saturation and was not rendering a usable feedabck signal when the optic was alledgely in aligned state. In this case we looked for the appropriate amount of feedback in stored data from a time in which the DRMI had been locked.
  • On Friday we went to the tunnel in order to put a better wind shield around SR3 oplev optics. The aim is to reduce the noise and then improve the performance of the control system.
  • We found large and heavy blank flanges leaning on the large SR3 and SRM frames. Removing them will likely disturb the position of the IPs, which would require readjustig the QPDs again. We would like the flanges to remain there for O3 if possible. Fabian will write a message to the vacuum group with our request.

Plan for the week 7/8

  • Terrence and Fabian will continue writing the oplev diagonalization procedure.
  • Fabian will install the rolled-off the DC control filters (carried on from last week).

Type-Bp (Shoda)

  • Checked the Traverser drivers work properly with Uraguchi-san's motors.
    • PR3 driver is alive from the beginning, and the PRM driver was not active since the switch of the PLC was in the wrong mode.
    • I changed the wire connection of the PR3 driver to have the same configuration with others. I will send the drivers with adapter cables for the PR3 to match the connection.
  • Briefly checked the effect of the wrongly directed magnets on PRM IM.
    • The initial estimation shows the order of 10^5 margin from the requirement with the 20 % of unbalance of the magnets. It should be OK even if the two magnets on the one flag was in the same direction.

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)

KAGRA/Subgroups/VIS/VISMinutes20190705 (last edited 2019-07-05 14:39:23 by YoichiAso)