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VIS (IMM)
takafumi.ushiba - 20:18 Friday 05 August 2022 (21718) Print this report
High bandwidth OpLev control for IMMT suspensuions

Abstract:
I implemented high-bandwidth (~ 1Hz) angular control for IMMTs.
It seems working welll.

Detail:
I measured mechanical transfer functions of IMMTs and made suspension models.
Measured data was stored at /kagra/Dropbox/Measurement/VIS/PLANT/{IMMT1,IMMT2}/2022/08/.
Reference number of the measurement is 202208051908.
Suspension models are stored at FM10 (SUSMod_220805) of TM_OLDAMP filter banks.

After making the model, I designed new OpLev DC control filter.
In this time, UGF is set at 1 Hz, which is 100 times larger than the previous design.
I tested new DC control and it seems working well.

Note:
OpLev DC controls are still disengaged at LOCK_ACQUISITION state because we need to change the gain of ASC control if we use setpoint pass for ASC.

Comments to this report:
takafumi.ushiba - 16:23 Saturday 06 August 2022 (21720) Print this report

I increased UGF of yaw OpLev DC control of IMMTs from 1 Hz to 3 Hz because there is a peak of yaw resonance in the OpLev signals.

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