|
Size: 4541
Comment:
|
Size: 4541
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 29: | Line 29: |
| * The coupled yaw motion in the TM oplev was reduced By adjusting the sensing matrix with translating the IP stage in L. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13359|klog#13359]]) | * The coupled yaw motion in the TM oplev was reduced by adjusting the sensing matrix with translating the IP stage in L. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13359|klog#13359]]) |
Agenda/Minutes of the VIS Meeting on 2020/3/6
2020/3/6 14:00 -
Participants:
Progress report
Type-A
Past week 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)
- ETMX/Y L2Y coupling reduction (Lucia)
The coupled yaw motion in the TM oplev was reduced by adjusting the sensing matrix with translating the IP stage in L. (klog#13359)
Plan for coming weeks
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.
Type B
Past week report
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.
Plan for coming weeks
Type-Bp
Past week report
Plan for coming weeks
OMMT & OSTM
Past week report
Plan for coming weeks
VIS electronics
Past week report
Plan for coming weeks
Other site works
Safety
Discussion
Status of ACC development (Takahashi)
- just curiosity (YF): Should we calculate the required sensor noise level beforehand for the purpose of blending?
Travel Plans
- Travel (Week of 3/9):
- Takahashi:
- Sato:
- Hirata:
- Shoda:
- Fujii:
- Tanaka:
- Travel (Week of 3/16):
- Takahashi: 16-18
- Sato:
- Hirata:
- Shoda:
- Fujii:
- Tanaka:
Next meeting
On 2020/3/13(Fri)