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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

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common issue

* RT model modification by K. Okutomi * Still seinsmometer signal is not delivered to the ITMY-real time model.

ITMY

• health check for the tower part by Lucia

  • F2-GAS TF looked weird. 9790

• health check for the payload part
  • not yet done.
• Guardian for ITMY was unified.
  • The failure of MN_DCCTRL seemed to be solved by the commissioners
• ITMY damping work is (kind of) started.

ETMY

• Inertial damping performance check
  • LVDT control vs. inertial control

    • Closing both L and T loops caused an oscillation at _ Hz.

      • => spectra?

      • => Due to cradle effect?

ETMX

• A test of sensor correction and feed-forwarding is now ongoing.

ITMX

• It seemed that the TML-oplev noise level issue did not due to the light source. Due to air-shielding?

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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.

Plan for the week 15-08-2019

• Finish measuring transfer functions.

• Begin the design of filters.

Type-Bp

Past week report

• New auto-measurement system is ready for -Bp. -B templates are now under preparation.

• New VIS app is released. ()

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: 12-16
  • Tanaka:

• Travel (Week of 8/19):

  • Takahashi: 22-24
  • Sato:
  • Hirata: 22-24
  • Shoda:
  • Fujii: 20-24
  • Tanaka:

Next meeting

On 2019/8/16(Fri)