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| * Maximum actuation range * X um: f < 0.5Hz * YYY nm: 0.5Hz < f < 1Hz * ZZ nm: 1Hz< f < 10Hz * Response to the feedback input is similar to a single pendulum |
* We try to maximize the actuation range with proper combination of actuators * Response to the feedback input should be 1/f^2 around the UGF |
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| * [[|Type-A commissioning schedule]] | |
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| Main people to work on Type-A | |
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| * ??? | * Yikang * Yamada * Mark * Fabian * Terrence |
Integrated Type-A control meeting
To Do
Model
- Mechanical model : SUMCOM
- Integrated model exists
- Tuning of the model parameters for individual suspension is necessary
- Electronics model and control loop model can be implemented in the Noise Budget tool
Existing suspension NB model
- Implement a standalone NB model for Type-A first
- Then integrate it into the IFO NB model
Sensor / actuator diagonalization
- Tower part is on going (a fair bit done already)
- CRY part will start from now
- VIS experts should join the work to expedite it
TF measurements
- Check the mechanical status of the suspension
- Base for the control
- Comparison against the model predictions
Damping control
- Except for ITMY, inertial damping is going to be completed
- Integrated work with CRY and VIS is necessary
- Modal damping for GAS (later ?)
Hierarchical control
- Procedure
- Measure TFs from various stages to TM
- Design blending filters to combine them
- Iteration
- Establishing a good suspension model is necessary in the filter design process
- Inject seismic noise to make sure that no actuator saturate
Automatic operation
- Guardian
- Currently fairly incomplete
- We can get help from the Type-B team (Mark and Terrence)
- Automatic health check
- Status monitor
Desired status before Y-arm lock
- All the sensors diagonalized
- All the actuators diagonalized
- All the TFs reasonably agree with the model
- Damping control satisfies the requirements
- Length RMS requirement
- Since ALS will be used, there is no dynamical requirement for L
- Saturation of the actuator while keeping the lock sets the requirement
- Angular RMS requirement
Less than 880nrad JGW-T1808343
- Length RMS requirement
- Hierarchical control is ready
- We try to maximize the actuation range with proper combination of actuators
- Response to the feedback input should be 1/f^2 around the UGF
Schedule
- 4/1 - 4/26: ITMY suspension commissioning
- 5/7-5/10: Y-arm lock with feedback to ITMY mass
- [[|Type-A commissioning schedule]]
People
Main people to work on Type-A
- Fujii
- Lucia
- Okutomi
- Ushiba
- Yikang
- Yamada
- Mark
- Fabian
- Terrence