Optimal control of the ARM alignment with digital compensation of the Sidles-Sigg radiation torque
- Document #:
- LIGO-T1800077-v4
- Document type:
- T - Technical notes
Other Versions:
- Abstract:
- We apply the optimal control techniques (H-infinity and mu-syntheses) to align the aLIGO arm cavity. For the soft mode, it can be further combined with the digital subtraction of the Sidles-Sigg torque so only one set of filters is needed for different input power levels. We show that our scheme can simultaneously improve the low-frequency rms motion and the high-frequency sensing noise. Moreover, the controller is robust under typical fluctuations in the arm power and/or sensing gain.
- Files in Document:
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- GWADW_18 (OptCtrl.pdf, 1.6 MB)
- Other Files:
- ASCnoise.pdf (670.3 kB)
- Topics:
- Authors:
- Associated with Events:
- GWADW 2018 held from 12 May 2018 to 17 May 2018