Agenda/Minutes of the VIS Meeting on 2019/5/24
2019/5/24 13:30 - 15:00
Participants: Hirata, Fabian, Sato, Ishizaki, Shoda, Fujii, Terrence, Aso, Okutomi,Akutsu
Progress report
Schedule
Site work schedule: [[|XLSX]]
Type-A (Takahashi)
Past week report
Plan for coming weeks
- I suggest the test of IP control with/without inertial damping in the engineering run in June.
Type B (Mark)
Past week report (written by Fabian)
Terrence implemented a filter for the inertial damping. See entry 8905.
The highlight of the week is Terrence's measurement of the residual motion of the SR2 optic: as measured by the oplev, it does fulfill the RMS displacement and velocity requirements for lock acquisition and, partially, for the observation mode also. See the report at klog entry 8949.
The integrated RMS was calculated from 5 Hz to DC because there are some peaks between 8 Hz and 10 Hz and whose origin still has to be clarified. See the report at entries 8918 and 8933.
- After Akutsu-san's suggestion Terrence improved the air shield in two rounds, including a cylindrical cover around the viewport. This reduced the noise by about a factor of 10.
- He realized setting up the shield may have slightly changed something in the oplev and carried out another round of diagonalization.
- He realized the H3 coil was not working. We fixed it.A cable was disconnected.
- The optic residual motion in L showed a large peaks close to 0.2 Hz, which is where the micro-seismic may become apparent. The peak was not seen in P or Y. The inertial damping system is likely not working in a suitable way. The blending frequency is 0.190 Hz which may not be low enough.
- At the end measurement of the residual motion reported was carried out with inertial damping only in yaw.
Fabian, Terrence and Fujii-kun measured the settings of the SR2, BS LVDT drivers and one of SR2's. See klogs 8941 , 8951 and 8952.
- Fabian worked more on the calculation of the amount of sensor noise injected:
- I imported Panwei's OSEM noise measurements and calculated the virtual sensor noise.
- I imported Fujii-kun's measuement of the geophone noise and calculated the virtual sensor noise.
- I imported the blending filter
- I wrote lots of comments in Sekiguchi-kun's Matlab scripts.
- I will write a klog soon with preliminar results.
- Fabian submitted and abstract for the Autumn JPS meeting on September.
Plan for coming weeks
- Terrence will work in the optimization of the inertial damping.
- We have to measure the settings of the SR3 LVDT driver.
- Fabian will continue with the calculation and prepare a presentation for the conference in Brazil.
Type-Bp (Shoda)
Past week report
LVDT driver boards are changed (klog8956)
Stepping motor BO are connected (klog8959)
Moderate WD is installed in PRM, and ready to be installed to the other PRs. (klog8939)
Plan for coming weeks
OMMT & OSTM (Takahashi)
Past week report
- Sato-san is checking the 3D model of TAMA-PO type suspension in the overall model around the 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
- Middle Sized Baffles
- TO DO List for O3
- Hierarchical control of Type-A (with CRY)
- Improved watchdog
- Digital
- Hardware
- Type-B IP damping
- Inertial or CMRR ?
- Guardian
- Type-A guardian missing
- Type-Bp guardian improvement
Include the OpLev TM loop
- VIS status monitor screens
- Operation manuals
- L2P diagonalization for all the suspensions
- Automatic off-load system
Travel Plans
- Travel (Week of 5/27):
- Takahashi:
- Sato:
- Mark: Holidays
- Hirata:
- Shoda:
- Fujii: 27-28
- Tanioka:
- Tanaka:
- Terrence:
- Travel (Week of 6/3):
- Takahashi:
- Sato:
- Mark: Holidays
- Hirata:
- Shoda:
- Fujii: 4-7
- Tanioka:
- Tanaka:
- Terrence:
Fabian & Okutomi: Conference in Brazil until June 18th
Next meeting
On 2019/5/31(Fri)