[Akutsu (remote), Ushiba]
Abstract:
We modified filter shape of PRCL, MICH, and DARM for handover TRAS signals to OMC.
The new filters seem working well, so we will try DC readout soon.
Detail will be posted tomorrow.
Detail:
Currently, error signals of PRCL, MICH, and DARM was fractuated at low frequency in the current PRFPMI_RF_LOCKED state, so we need to modified control loops to supress the residual motion of each DoFs.
Figure 1, 2 and 3 show the new OLTF of PRCL, MICH, and DARM control, respectively.
Figure 4, 5, and 6 show the error signals of PRCL, MICH, DARM, when changing filters from old one to new ones.
T cursor chows the timing when engaging filters.
Error signals of PRL, MICH, and DARM becomes smaller and the loop seems stable enough.
So, I will try to switch TRAS signals to OMC DC for the next step.
