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2019/6/21 13:30 - 2019/6/21 13:30 - 14:38

Agenda/Minutes of the VIS Meeting on 2019/6/21

2019/6/21 13:30 - 14:38

Zoom Meeting

Participants: Terrence, Fabian, Takahashi, Hirata, Sato, Mark, Shoda, Fujii, Aso, Okutomi, Tanaka, Ishizaki

Progress report

Type-A (Takahashi)

Past week report

  • Checked stock parts.
  • Sent back a spare ACC unit to Mitaka for developments.

News
  • ITMY
    • we decided to go with current configuration for the time being.
  • ETMY
    • During a measurement, YF kicked IP accidentally and the orientation of ETMY went away.
      • Everything should be free now since BFYexc and MNexc transfer functions looked consistent with the ones measured before this kick.
      • Only the orientation was changed somehow.
      • We decided to open the chamber. The cryocooler was turned off already.

    • During another measurement. it was found that F3-GAS was working properly at the current position (klog#9293).

      • since the shapes of the GAS mechanical transfer functions were changed from the precious ones, I updated the modeled transfer function and filters in the filter-bank.

Building damping system for payload
  • ITMX / ETMY
    • I started to measure the mechanical transfer functions with Photo-sensors for building.
      • ETMY-MN/IM * 6dof, done. Sensor/actuator diagonalization is necessary indeed.

RT-model, MEDM, guardian updates

Plan for coming weeks

  • Modify/install RT-model
  • update MEDM, guardian
  • tune the filters

Type B (Mark)

Past week report

Report for the week 6/17 (written by Fabian)

  • Izum-san pointed out the SR3 oplev control loop was not able to damp resonances at 1.4 Hz and 1.2 Hz (klog 9290). Terrence checked (klog 9299):

    • He found that the optic TFs were coupled to about 10%. I assume something changed because, as far as I understand (Fabian), the oplev had been succesfully diagonalized before to less than 1% coupling.
    • He moved the IP and compared IP LENGTH with OPLEV LENGTH noting the the oplev was reading only 70% of the IP displacement.
    • In this conditions he diagonalized the oplev but failed. There was still coupling.
    • He introduced a factor to have the OPLEV LENGTH measurement equal to IP LENGTH measurement.
    • He successfully diagoinalized the oplev.
    • He then proceeded to checked the filter but he was unable to reduce the residual motion. Noise is the suspect. Having appropriate wind shield is recommended.
  • Fabian worked in rolling-off the control filters of the GAS filters.

    • According to klog 8979 the GAS filter control noise has to decrease by 5 orders of magnitude in order to meet the requirement at 10 Hz.

    • A Butterworth filter of order 20 with a cut-off frequency of 5 Hz seems to reduce the noise but renders the system unstable.
    • More work is necessary.
  • Fabian joined Enomoto-kun's lecture on how to align the X Fabry Perot cavity with green light.

  • VIS simplified monitor is available. 9298.

Plan for the week 6/24

  • Fabian will continue working in the rolling-off of the filters of the GAS filters control loops.
  • Improve VIS monitor
  • Help commissioning

Leftover
  • Lock filters for gound motion common-mode rejection.
  • SR3 inertial damping, windshield.
  • Type B operation manual.

Vacation/Travel Info

  • Terrence goes back to Hong Kong on 7/27.
  • Mark's final day 6/28.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Takahashi)

Past week report

  • Checked stock OSEMs. There are 17 units.
  • Disassembled the pillars of the MC suspension for modification.
  • Ordered the modification parts.
  • Making the overall 3D model around OMC.

Plan for coming weeks

VIS electronics (Tanaka)

Past week report

Plan for coming weeks

Other site works

Safety

  • Incidents:
  • Foreseen risks
    • Type-A:
    • Type-B:

Discussion

DAQ channel reduction

Realtime model update policy

  • Make local copies of the relevant files (.mdl, MEDM files etc) to modify an existing RTM.
    • Once the modifications are complete, you can deploy the modified files by replacing the existing ones.
  • Notify the relevant people (kagra-seis and gokagra ML) in advance (more than a day) of the deployment of the modified RTM.
  • Deployment should be complete.
    • Do not attempt a partial update, such as changing only ETMX. Update all the suspensions of the same kind (Type-A, B, Bp) at once, unless there is a good reason to do so.
    • Update MEDM screens at the same time to reflect changes in the RTM.
    • People can test the modified RTM during non-interferometer-commissioning time, i.e. in the morning.
      • After the test, the RTM should be reverted to the original one, before the interferometer commissioning starts.

Where to put the hardware WDS ?

  • Type-Bp: GAS LVDT ?
  • Type-B: IP ?
  • Type-A: IP ?

POS table cover box

Travel Plans

  • Travel (Week of 6/24):
    • Takahashi:
    • Sato:
    • Mark:
    • Hirata:
    • Shoda:
    • Fujii: 26-28
    • Tanioka:
    • Tanaka:
    • Terrence:
  • Travel (Week of 7/1):
    • Takahashi:
    • Sato:
    • Mark:
    • Hirata:
    • Shoda:
    • Fujii: 1-4
    • Tanioka:
    • Tanaka:
    • Terrence:

Fujii: Amaldi 7/6-14

Next meeting

On 2019/6/28(Fri)

KAGRA/Subgroups/VIS/VISMinutes20190621 (last edited 2019-06-21 14:38:35 by YoichiAso)