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Participants: Participants: Takahashi, Sato, Hirata, Tanaka, Shoda, Aso, Fabian, Miyo, Lucia
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  * '''Status''' : Please check about Type-A and Type-Bp. ([[https://github.com/gw-vis/kagra-vis/issues/9|Issues list]])-> I will make a private meeting with Okutomi-san and Fuji-kun on Saturday to discuss these. ([[https://github.com/gw-vis/kagra-vis/issues/7|Type-B is OK]]. Thank you fabian! :) )   * '''Status''' : Please check about Type-A and Type-Bp. ([[https://github.com/gw-vis/kagra-vis/issues/9|Issues list]]) -> __I will make a private meeting with Okutomi-san and Fuji-kun on Saturday to discuss__
  * [[https://github.com/gw-vis/kagra-vis/issues/7|Type-B is OK]]. Thank you fabian! :)
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  * '''Status''' Need information about the pin assignment for all suspensions -> Sato-san? and Shoda-san?   * '''Status''' Need information about the pin assignment for all suspensions -> __Sato-san? and Shoda-san?__
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 * Started the design of LVDT combiner with additional filters.
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 * Papers (Type-B: Fabian, Type-A: Lucia?)  * Papers
  * Type-B: Fabian. Share the contents.
  * Type-A: Lucia. Ask Fujii-kun about his situation.
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  * Basically safety mode is employed.
  * DC control is turned off for the GAS filters. Monitor the drift. If necessary, require temperature adjustment.
  * DC control is kept for the IPs. Monitor the drift. If necessary, offload by remote.
  * DC control is kept for the BF yaw after the offload. Monitor the drift. If necessary, offload again by remote.
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 * [[https://paper.dropbox.com/doc/Plan-for-the-long-OR-brake--AxxlJFvK1IGJjqrG5nfdHfGXAQ-KqexeqMaCA7DITFGxA5ih|Plan]]  * [[https://paper.dropbox.com/doc/Plan-for-the-long-OR-brake--AxxlJFvK1IGJjqrG5nfdHfGXAQ-KqexeqMaCA7DITFGxA5ih|Plan]]: Confusing with the post-O3 task. Should be combined with priority.
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 * Had the control meeting.

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

2020/4/17 14:00 -

Zoom Meeting

Participants: Takahashi, Sato, Hirata, Tanaka, Shoda, Aso, Fabian, Miyo, Lucia

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 .

    • Purpose : To check the consistency in the klog information.

    • Status : Please check about Type-A and Type-Bp. (Issues list) -> I will make a private meeting with Okutomi-san and Fuji-kun on Saturday to discuss

    • Type-B is OK. Thank you fabian! :)

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

    • Purpose : To make a consensus about the cabling with AEL and CRYO group for O4.

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

Type-A

Type B

  • 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

  • Started the design of LVDT combiner with additional filters.

Post O3 (4/21~)

  • Request

  • Papers
    • Type-B: Fabian. Share the contents.
    • Type-A: Lucia. Ask Fujii-kun about his situation.
  • Operation mode at the shutdown of KAGRA
    • Basically safety mode is employed.
    • DC control is turned off for the GAS filters. Monitor the drift. If necessary, require temperature adjustment.
    • DC control is kept for the IPs. Monitor the drift. If necessary, offload by remote.
    • DC control is kept for the BF yaw after the offload. Monitor the drift. If necessary, offload again by remote.

Towards O3c

  • Plan: Confusing with the post-O3 task. Should be combined with priority.

Controls

  • 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.

  • Had the control meeting.

Safety

Discussion

Travel Plans

Next meeting

On 2020/4/24(Fri)

KAGRA/Subgroups/VIS/VISMinutes20200417 (last edited 2020-04-18 10:45:23 by RyutaroTakahashi)