Differences between revisions 6 and 7

Agenda/Minutes of the VIS Meeting on 2020/3/6

2020/3/6 14:00 -

Participants:

Progress report

ITMX GAS control output accumulated (Reported by Washimi, klog#13259)
- Even the temperature variation was not so drastic (by less than 1 ℃), the absolute value of the control output reached 20,000 counts.
IP control for seismic attenuation (Lucia, Fujii)
- 0.2 Hz resonant gain implemented but not effective. (klog#13294, #13357)
ITMY GAS height adjustment for beam position improvement (Nakano, Aso, Lucia, Okutomi)
- In order to suppress the 1-Hz growing up with the PRFPMI locked, we wanted to lift up the ITMY.
- ITMY F3 GAS fishing rod brought up the payload by 2 mm, but it was cancelled due to unhealthy oplev sum behavior .(klog#13304)

Just curiosity (YF): Do we have any chances to try to implement feed-forwarding at IP-stage in the commissioning break?
- If we have a time period that no one uses the interferometer, maybe I feel I would like to try.

I uploaded a document in the JGWDoc website describing the intended work for Type-B suspensions in 2020: JGW-E2011534. The motivation was just to have source of clear information of what we have to do. It doesn't have to be limited to Type-B.
Limits switches for F0 yaw stepper motor:
- Last week there was an uncertainty as to how we connected the exisitng F0 yaw stepper motors in SR suspensions; there was a discrepancy between the cabling diagram and what I remembered.
- We checked the documentation and we remembered Hirata-san improvised 50 cm cable assemblies with 1.5 mm plugs (Burndy) in one end and a male D-sub in the other, then we used a 2.5 m extension cable with female connectors in both ends to reach the flange (Type 2-2.5). Only four threads were connected.
- For the work this year we will need, for Type-B only, 4 × 50 cm cable assemblies with eight 1.5 mm plugs (Burndy) in one and a male D-Sub connector in the other; additionally, we will require 1 × 2.5 m extension cable with female connectors in both ends for the BS, which doesn't have the yaw stepper motor.
Limit switches for SR IPs: it seems all the harware is connected and all we need to do is just to learn how to use them in software; is this statement correct?
What's the status of the oplev boxes?
Was there a problem with SR2 real-time model? I heard in the morning briefing today this was solved by Aso-san.

Status of ACC development (Takahashi)
- just curiosity (YF): Should we calculate the required sensor noise level beforehand for the purpose of blending?

On 2020/3/13(Fri)

KAGRA/Subgroups/VIS/VISMinutes20200306 (last edited 2020-03-09 10:14:09 by RyutaroTakahashi)

-  ⇤ ← Revision 6 as of 2020-03-06 13:35:24 → 
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+   ← Revision 7 as of 2020-03-06 13:59:45 → ⇥
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  Editor: KokiOkutomi
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+ * ITMX GAS control output accumulated (Reported by Washimi, [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13259|klog#13259]])
  * Even the temperature variation was not so drastic (by less than 1 ℃), the absolute value of the control output reached 20,000 counts.
 * IP control for seismic attenuation (Lucia, Fujii)
  * 0.2 Hz resonant gain implemented but not effective. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13294|klog#13294]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13294|#13357]])
 * ITMY GAS height adjustment for beam position improvement (Nakano, Aso, Lucia, Okutomi)
  * In order to suppress the 1-Hz growing up with the PRFPMI locked, we wanted to lift up the ITMY.
  * ITMY F3 GAS fishing rod brought up the payload by 2 mm, but it was cancelled due to unhealthy oplev sum behavior .([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13304|klog#13304]])