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2020/3/6 14:00 - | 2020/3/6 14:00 - |
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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]]) * 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. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13359|klog#13359]]) |
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* Just curiosity (YF): Do we have any chances to try to implement [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13335|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. |
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* I uploaded a document in the JGWDoc website describing the intended work for Type-B suspensions in 2020: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11534|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. |
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* just curiosity (YF): Should we calculate the required sensor noise level beforehand for the purpose of blending? * (YF): Do we have any plan to update the seismic spectra at the site? * (KM): つ [[https://github.com/MiyoKouseki/kagra-gif/issues/108|Seasonal Change Spectrum]] |
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?
- (YF): Do we have any plan to update the seismic spectra at the site?
(KM): つ Seasonal Change Spectrum
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)