Agenda/Minutes of the VIS Meeting on 2019/6/14
2019/6/14 13:30 -
Participants:
Progress report
Type-A (Takahashi)
Past week report
Plan for coming weeks
Type B (Mark)
Report for the week 6/10
- Supporting the commissioning team.
BS
- Type B inertial damping. This means geophone diagonalization, blending filter optimizing, etc.
Optimization gives an odd looking blending filter that blends at ~120 Hz, but works fine in IP L. 9199
- During PRMI lock, BS residual motion was too high that misaligned the beam too much from time to time and making the lock unstable.
To fix this, I improved OL windshield so I can study the residual motion of the BS. Then I copied IP L blending filter to IP T and IP Y and cranked up the IP damping and TM damping gain. This suppressed the residual motion so the requirements are met. After this, the BS was not causing any problem to the lock anymore. 92199235
Guardian
Upon request from the commissioning team, we changed the guardian so the aligned state uses OL DC IM2TM control. The set point will be taken to be a reference channel that is created by Nakano-san to record to OL good position. While in the misaligned state, we use a large OPTIC ALIGN offset to the optic very far away (hence the OL will not be useful). 9196
Type-Bp (Shoda)
Past week report
Plan for coming weeks
OMMT & OSTM
Past week report
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
Travel Plans
- Travel (Week of 6/17):
- Takahashi:
- Sato:
- Mark:
- Hirata:
- Shoda:
- Fujii:
- Tanioka:
- Tanaka:
- Terrence:
- Travel (Week of 6/24):
- Takahashi:
- Sato:
- Mark:
- Hirata:
- Shoda:
- Fujii:
- Tanioka:
- Tanaka:
- Terrence:
Next meeting
On 2019/6/21(Fri)