Agenda/Minutes of the VIS Meeting on 2019/8/9
2019/8/9 14:00 -
Participants:
Progress report
Type-A
Past week report
Edit conflict - other version:
Edit conflict - your version:
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?
- LVDT control vs. inertial control
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?
End of edit conflict
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.
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:
- Tanaka:
Travel (Week of 8/19): * Takahashi:
- Sato:
- Hirata:
- Shoda:
- Fujii:
- Tanaka:
Next meeting
On 2019/8/16(Fri)