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2019/6/21 13:30 - 		 2019/6/21 13:30 -
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  * we decided to go with current configuration for the time being.   * we decided to go with current configuration for the time being.
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  * 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 arriver at the current position (klog#).
     * 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.		   * 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 arriver at the current position (klog#).
   * 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.
Line 28: Line 27:
  * ITMX / ETMY
   * I started to measure the mechanical transfer functions with Photo-sensors for building.
      * ETMY-MN * 6dof, done. Sensor diagonalization would be necessary.		  * ITMX / ETMY
  * I started to measure the mechanical transfer functions with Photo-sensors for building.
   * ETMY-MN * 6dof, done. Sensor diagonalization would be necessary.
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  *     *
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==== Plan for coming weeks ==== ==== Report for the week 6/17 ====
 * Izum-san pointed out the SR3 oplev control loop was not able to damp resonances at 1.4 Hz and 1.2 Hz (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9290|9290]]). Terrence checked (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9299|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 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8979|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.

==== Plan for the week 6/24 ====
 * Fabian will continue working in the rolling-off of the filters of the GAS filters control loops.

==== Vacation/Travel Info ====
 * Terrence goes back to Hong Kong on 7/27.
 * Mark's final day 6/28.
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Line 61: Line 73:
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  * Type-A:    * Type-A:
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  * Type-Bp: GAS LVDT ?
  * Type-B: IP ?
  * Type-A: IP ?		  * Type-Bp: GAS LVDT ?
 * Type-B: IP ?
 * Type-A: IP ?
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  * Takahashi: 
  * Sato: 
  * Mark: 
  * Hirata: 		   * Takahashi:
  * Sato:
  * Mark:
  * Hirata:
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  * Fujii:    * Fujii:
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  * Takahashi: 
  * Sato: 
  * Mark: 
  * Hirata: 		   * Takahashi:
  * Sato:
  * Mark:
  * Hirata:
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  * Fujii:    * Fujii:

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

2019/6/21 13:30 -

Zoom Meeting

Participants:

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 arriver at the current position (klog#).
      • 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 * 6dof, done. Sensor diagonalization would be necessary.

RT-model, MEDM, guardian updates

Plan for coming weeks

Type B (Mark)

Past week report

Report for the week 6/17

  • 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.

Plan for the week 6/24

  • Fabian will continue working in the rolling-off of the filters of the GAS filters control loops.

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.

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:
    • Tanioka:
    • Tanaka:
    • Terrence:
  • Travel (Week of 7/1):
    • Takahashi:
    • Sato:
    • Mark:
    • Hirata:
    • Shoda:
    • Fujii:
    • Tanioka:
    • Tanaka:
    • Terrence:

Next meeting

On 2019/6/28(Fri)

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