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2019/8/16 14:00 - 		 2019/8/16 14:00 -
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  * For this purpose, we have to modify the model again.
     * For this purpose, we have to modify the model again.
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   * What is the summary for this week?      * What is the summary for this week?
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  * The difference between the above is like about 405um (it went to lower position), based on GAS_LVDTINF_OUT channel.    * The difference between the above is like about 405um (it went to lower position), based on GAS_LVDTINF_OUT channel.
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  * lopg: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9996|9996]]
  => status and plan?		   * lopg: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9996|9996]] => status and plan?
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  * utilize the TMY to BFY loop again, etc.    * utilize the TMY to BFY loop again, etc.
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  * make paths from TM to IPL, BFL to IPL.    * make paths from TM to IPL, BFL to IPL.
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=== Type B ===
==== Report for the week 15-08-2019 ====
 * Shoda-san improved the SR3 optic yaw motion (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9949|9949]]).
  * Improvement in the frequency band from 1 Hz to 2.3 Hz was achieved by modifying the IM-Y filter. The problem was not enough phase margin.
  * There's still a peak at 1.3 Hz.
  * She also modified the IM SENSALIGN matrix (diagonalization according to resonance peaks?)
  * Transfer functions should be measured again.
 * The BS optic has a large peak at 150 mHz (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9991|9991]]).
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=== Type B ===
==== Past week report ====
==== Plan for coming weeks ====		 ==== Plan for the week 19-08-2019 ====
 * Enomoto-kun requested to extend the oplev control loop down to where the micro-seismic peak is. (Fabian.)
 * Assemsment of the motion of the SR optics around the micro-seimic region. (Due today.)
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  * Hirata: 		   * Sato:
  * Hirata:
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  * Fujii:    * Fujii:
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  * Takahashi: 
  * Sato: 
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  * Fujii:    * Fujii:

Agenda/Minutes of the VIS Meeting on 2019/8/16

2019/8/16 14:00 -

Zoom Meeting

Participants:

Progress report

Type-A

Past week report

  • For the 150mHz-ish mode damping
    • sensor correction for IP, i.e., seismic signal subtraction system, was implemented to all the type-A suspensions.
    • BF-L/T damping was also implemented for this damping.

      • The RMS was suppressed by a factor of like 2.7, log 9961

    • (SC at IP) + (BF-L/T) made the system quieter compared to the previous, however, it was not enough
      • IP-TF does not have the peak at 150mHz-ish.
      • BF-actuation efficiency is not so high.

      • => we will try to the feedback like BFl to IPL, or TML to IPL, for the next.

        • For this purpose, we have to modify the model again.

  • For inertial damping performance test, LVDT damping vs. inertial damping > By Lucia

    • ETMY: 9981

    • ITMX: 9995

      • What is the summary for this week?
  • length-oplev calibration with green lock

    • log: 9989

    • 1st trial. The values are *NOT* installed to the MEDM since we could not guarantee if we were observing TML motion not TMY motion. It looks they are not terrible values, compared to ground motion though.
  • F3-GAS of EY: looks stacked again

    • log at 2019 Aug. 15th, when it was stuck: 9990

    • log at 2019 Aug. 15th, when it was free: 9293

      • The difference between the above is like about 405um (it went to lower position), based on GAS_LVDTINF_OUT channel.
  • ETMY health check

    • lopg: 9996 => status and plan?

  • Listed up the modification parts in the 3D CAD model.

Plan for coming weeks

  • Guardian stuff
    • utilize the TMY to BFY loop again, etc.
  • RTmodel modification
    • make paths from TM to IPL, BFL to IPL.
  • 150mHz-ish suppression
    • implement loops like TM to IP.

Type B

Report for the week 15-08-2019

  • Shoda-san improved the SR3 optic yaw motion (klog 9949).

    • Improvement in the frequency band from 1 Hz to 2.3 Hz was achieved by modifying the IM-Y filter. The problem was not enough phase margin.
    • There's still a peak at 1.3 Hz.
    • She also modified the IM SENSALIGN matrix (diagonalization according to resonance peaks?)
    • Transfer functions should be measured again.

  • The BS optic has a large peak at 150 mHz (klog 9991).

Plan for the week 19-08-2019

  • Enomoto-kun requested to extend the oplev control loop down to where the micro-seismic peak is. (Fabian.)
  • Assemsment of the motion of the SR optics around the micro-seimic region. (Due today.)

Type-Bp

Past week report

Plan for coming weeks

OMMT & OSTM (Takahashi)

Past week report

  • Ordered the dummy mirror to be used for gluing test.

Plan for coming weeks

VIS electronics

Past week report

Plan for coming weeks

Other site works

Safety

  • Incidents:

Discussion

  • For the people in Kamioka, checking the presence/absence at the site will help us (not only for Mitaka persons).

Travel Plans

  • Travel (Week of 8/19):
    • Takahashi: 22-24(F2F)
    • Sato:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanaka:
  • Travel (Week of 8/26):
    • Takahashi:
    • Sato:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanaka:

Next meeting

On 2019/8/29(Fri)

KAGRA/Subgroups/VIS/VISMinutes20190816 (last edited 2019-08-16 15:51:08 by YoichiAso)