Agenda/Minutes of the VIS Meeting on 2020/4/17

2020/4/17 14:00 -

Zoom Meeting

Participants:

VIS Commissioning Task List

Task list towards O4

Schedule afetr O3

Progress report

General

(Miyo) I'm gathering information about the hardware part. (e.g. cabling, calibration of sensors and actuators.)

• JGW-T2011597 Calibration factors of LVDTs .

  • Please check about Type-A and Type-Bp. (Type-B is OK. Thank you fabian!)

• JGW-D2011573 Cabling diagram which includes connections between AEL circuits and pin assignment at the feed-through.

  • Need information about the pin assignment for all suspensions -> Sato-san? and Shoda-san?

Type-A

• Revising the Type-A installation procedure.

Type B

• For a summary of the current status of inertial damping in Type-B suspensions see the appendix (p14 onwards) in this presentation shown the Commissioning Meeting on the 27th of September 2019.

• In the context of writing a paper I gathered information about OSEMs and LVDTs and uploaded a document at : JGW-T2011612, which I will be updating.Currently the content is

  • Linear ranges of 24 OSEMs and
  • Sensitivity of the six SRM OSEMS.
• I gave feedback to Miyo-kun about LVDTs: all the current calibration factors in medm screens are consistent with klog reports. Just as a reminder:
  • The polarity of LVDTs is set in hardware: increase in LVDT output always means upwards motion or positive yaw in the IPs. Therefore, calibration factors in medm screens should always be positive.
  • An exception seems to be BS IP H2 LVDT, whose medm screen I have to check for a minus sign somewhere.
  • The offsets in medm screens correspond to the nominal places of keystones per the 3D-CAD, not the mid-point of the linear range.

Type-Bp

Type-C

Electronics

Post O3 (4/21~)

• Request

• Papers (Type-B: Fabian, Type-A: Lucia?)
• Operation mode at the shutdown of KAGRA

Towards O3c

• Plan

Controls

• Had a VIS control strategy meeting documents

Safety

Discussion

Travel Plans

Next meeting

On 2020/4/24(Fri)