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  * Additionally, according to Miyakawa-san Type B is using a wrong software inti-whitening filter. Apparently there was a confusion with normalized and non-normalized parameters.

Agenda/Minutes of the VIS Meeting on 2019/8/9

2019/8/9 14:00 -

Zoom Meeting

Participants:

Progress report

Type-A

Past week report

Plan for coming weeks

Type B

Report for the week 05-08-2019

  • After Shoda-san's report (entry 9797) I checked the condition of the filters in FLOAT state.

    • After a few tests I realized the whitening chassis didn't have a whitening filter board. See entry 9844.

    • I replaced the chassis with an appropriate one. See entry 9876.

  • I checked the configuration of the hardware whitening filters by checking the 32 bit dip switch boards for each supension. See entry 9823 and 9876.

    • The switch configuration is the same for SRM and SR2.
    • For BS and SR3 the configurations are different.
    • Additionally, the configuration of the two boards used for the BS oplev are different from each other.
    • This situation should be reviewed.
    • Type Bp and Type A don't seem to be using software anti-whitening filters for oplevs. I haven't checked their hardwate whitening filters' configuration though.

  • At the begining of the week I continued noise hunting in SR3. See entry 9807. The goal was to identify the limiting elements for the control system in ALIGNED state. See entries

    • The motion of the IP-L induces motion in TM-P and TM-L in the frequency band from 0.135 Hz to 0.4 Hz. This should be fixed at the IP. There's no inertial damping yet.

    • The motion of the IM-L induces motion in TM-P nd TM-L in the frequency band from 0.3 Hz to 0.8 Hz. Likely, this should be fixed with IML2TMP and IML2TML control filters.

    • The motion of the IM-P induces motion in TM-P and TM-L in the frequency band from 0.135 Hz to 1 Hz. The motion in the band from 0.135 to 0.4 Hz is likely ground motion coming from the IP, however, the motion from 0.4 Hz to 1 Hz should be fixed with IMP2TML and IMP2TMP control filters.

    • The motion in IM-Y induces motion TM-Y between 1 Hz and 2.3 Hz. This should be fixed with IMY2TMY control filters.

    • I began measuring transfer functions (IM-L to TM-L) but I should finish the setting the software anti-whitening filter first.

Plan for the week 15-08-2019

  • Finish measuring transfer functions.
  • Begin the design of filters.

Type-Bp

Past week report

Plan for coming weeks

OMMT & OSTM (Takahashi)

Past week report

  • Evaluated 9 of 16 OSEMs. 7 OSEMs are not useful.
  • Assembled the mirror gluing jig with the modification parts.

Plan for coming weeks

VIS electronics

Past week report

Plan for coming weeks

Other site works

Safety

  • Incidents:

Discussion

Travel Plans

  • Travel (Week of 8/12):
    • Takahashi:
    • Sato:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanaka:
  • Travel (Week of 8/19):
    • Takahashi:
    • Sato:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanaka:

Next meeting

On 2019/8/16(Fri)

KAGRA/Subgroups/VIS/VISMinutes20190809 (last edited 2019-08-09 14:42:19 by RyutaroTakahashi)