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| ==== Past week report ==== ==== Plan for coming weeks ==== |
==== Report for the week 6/10 ==== * Supporting the commisioning 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. [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=9199|9199]] * During PRMI lock, BS residual motion was too high which 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. [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=9219|9219]][[https://klog.icrr.u-tokyo.ac.jp/osl/?r=9235|9235]] ===== Guardian ===== * We changed the guardian so the aligned state uses OL DC IM2TM control, 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). |
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 commisioning 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 which 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
- We changed the guardian so the aligned state uses OL DC IM2TM control, 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).
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)