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| * Started the design of LVDT combiner with additional filters. |
Agenda/Minutes of the VIS Meeting on 2020/4/17
2020/4/17 14:00 -
Participants: Takahashi, Sato, Hirata, Tanaka, Shoda, Aso, Fabian, Miyo, Lucia
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
Revising the Type-A installation procedure.
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~)
- Papers
- Type-B: Fabian.
- Type-A: Lucia. Ask Fujii-kun his situation.
- Operation mode at the shutdown of KAGRA
- Basically safety mode is employed. The DC control should be kept for the IPs. We will check the necessity of the DC control for the BF yaw just before the shutdown.
Towards O3c
- 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)