gabriele.vajente@LIGO.ORG - posted 20:53, Monday 04 June 2018 (42316)
Changes to IMC and related SUS models for dithering implementation
[Sheila, Gabriele]
Today we wanted to check the beam spot position on the IMC mirrors, with the additional goal of having a continuous monitoring (and possibly control) of the IMC "uncontrolled" DOF4 (which is related to the output pointing).
We soon realized that the current implementation of the dithering had some limitations: 1) only one local oscillator 2) sine added to the angular control signal and sent to the top stage instead of the bottom stage
Therefore, we modified the h1ascimc, h1susmc1, h1susmc2 and h1susmc3 model:
- added 8 oscillators, one for each IMC ASC degree of freedom (pitch and yaw)
- the oscillator signals are sent to the suspensions with new IPCs, and added to the bottom stage
- the demodulated signals can be used for feedback if desired
Medm screens have been edited. Models have been compiled, installed and restarted. Model and medm screens committed.