Agenda/Minutes of the VIS Meeting on 2019/6/21
2019/6/21 13:30 - 14:38
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.
- During a measurement, YF kicked IP accidentally and the orientation of ETMY went away.
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.
- I started to measure the mechanical transfer functions with Photo-sensors for building.
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
Schedule(PDF/MPP)
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)