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=== Type B ===
==== Report for the week 7/29 (Written by Fabian) ====
 * I offloaded fishing rods in GAS filters and IPs in BS and SRM.
 * I implemented scripts for the automatic measurement of amplitude spectral densities (ASDs) of suspension sensors (usually used for residual motion estimation).
 * Highlights of recent ASD measurements can be found in entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9726|9726]]. The residual motion was measured in ALIGNED and FLOAT states.
  * In SRM and SR3 the motion in ALINED state was smaller than in FLOAT state, which is expected. See entries and respectively .
  * In SR2, the motion in '''pitch''' and '''yaw''' displacement is '''larger in ALIGNED state''', and the '''longitudinal velocity''' is the '''same in both states'''.
  * In BS, the '''longitudinal displacement''' is the '''same in both states'''.
 * Some features of the measured ASDs are the following:
  * In '''SRM, SR3 and SR2''' in '''pitch''' there is either a large bump (SRM and SR3) or excitation (SR2) between 0.3 Hz and 1 Hz. [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9756|9756]].
  * In '''SRM pitch''' the control system seems to be introducing noise in two frequency bands, before and after the bump. See [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9756|9756]].
  * In '''SR3 pitch''' the control loops seems to be introducing noise between 1 Hz and 2 Hz. See [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9755|9755]].
  * In '''SR2 pitch''' the control loops seems to be introducing noise between 0.380 Hz and 2 Hz. See [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9752|9752]].
  * In '''SR2 yaw''' the control loops seems to be introducing noise between 0.045 Hz and 0.230 Hz. See [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9752|9752]].
  * In '''SR2 longitudinal speed''' the control system seems to excite a large peak at 0.705 Hz. See [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9752|9752]].
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=== Type B ===
==== Past week report ====
==== Plan for coming weeks ====		 ==== Plan for the week 8/5 ====
 * Check the BS amplitude spectral densities.
 * Check the longitudinal degree of freedom in SRs.
 * Aim to identify noise sources.
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  * Takahashi: 
  * Sato: 
  * Hirata: 		   * Takahashi:
  * Sato:
  * Hirata:
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  * Fujii:    * Fujii:
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  * Takahashi: 
  * Sato: 
  * Hirata: 		   * Takahashi:
  * Sato:
  * Hirata:
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  * Fujii:    * Fujii:

Agenda/Minutes of the VIS Meeting on 2019/8/2

2019/8/2 14:00 -

Zoom Meeting

Participants:

Progress report

Type-A

Past week report

Plan for coming weeks

Type B

Report for the week 7/29 (Written by Fabian)

  • I offloaded fishing rods in GAS filters and IPs in BS and SRM.
  • I implemented scripts for the automatic measurement of amplitude spectral densities (ASDs) of suspension sensors (usually used for residual motion estimation).

  • Highlights of recent ASD measurements can be found in entry 9726. The residual motion was measured in ALIGNED and FLOAT states.

    • In SRM and SR3 the motion in ALINED state was smaller than in FLOAT state, which is expected. See entries and respectively .

    • In SR2, the motion in pitch and yaw displacement is larger in ALIGNED state, and the longitudinal velocity is the same in both states.

    • In BS, the longitudinal displacement is the same in both states.

  • Some features of the measured ASDs are the following:

    • In SRM, SR3 and SR2 in pitch there is either a large bump (SRM and SR3) or excitation (SR2) between 0.3 Hz and 1 Hz. 9756.

    • In SRM pitch the control system seems to be introducing noise in two frequency bands, before and after the bump. See 9756.

    • In SR3 pitch the control loops seems to be introducing noise between 1 Hz and 2 Hz. See 9755.

    • In SR2 pitch the control loops seems to be introducing noise between 0.380 Hz and 2 Hz. See 9752.

    • In SR2 yaw the control loops seems to be introducing noise between 0.045 Hz and 0.230 Hz. See 9752.

    • In SR2 longitudinal speed the control system seems to excite a large peak at 0.705 Hz. See 9752.

Plan for the week 8/5

  • Check the BS amplitude spectral densities.
  • Check the longitudinal degree of freedom in SRs.
  • Aim to identify noise sources.

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

  • Incidents:

Discussion

Travel Plans

  • Travel (Week of 8/5):
    • Takahashi:
    • Sato:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanaka:
  • Travel (Week of 8/12):
    • Takahashi:
    • Sato:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanaka:

Next meeting

On 2019/8/9(Fri)

KAGRA/Subgroups/VIS/VISMinutes20190802 (last edited 2019-08-02 11:10:49 by YoshinoriFujii)