Sheila, Elli

We tried to move ASC inputs to MICH and SRC1 from AS_B_RF36 to AS_A_RF36 as outlined in Sheila's alog 17623.  We are trying to use ASC-AS_A_RF36_I to control the SRM using SRC1 and ASC-AS_B_RF36_Q to control the BS using MICH.

Today we tried to rephase the AS_B WFS to minimise the effect of SRM misalignment in the Q phase.  Yesterday we tried this by injecting a 12Hz pitch signal into the SRM and minimising the 12Hz line in the ASC-AS_A_RF36_[Q1/Q2/Q3/Q4]_ERR for each of the four quadrants (Q1/Q2/Q3/Q4).  Today we tried a similar thing, except we excited both pitch and yaw on SUS-SRM_M3_LOCK_Y_EXC and SUS-SRM_M3_LOCK_P_EXC at 10 and 12 Hz respectively.  We tried to set the phase of each AS_A_RF36 quadrant to minimise the 10Hz and 12Hz lines simultaneously.  We changed Q1 from -50 to -40, Q2 from -90 to -70, Q3 from -60 to -50, and Q4 from -50 to -20.  It looked like we ended up with smaller signals in the Q-quadrature than we started with.

We also reset the dark offsets on AS_A_RF36.  We unlocked the IMC to do this.

After rephasing AS_A_RF36 and rezoeroing the dark offset, we went to DRMI_LOCKED on ISC_LOCK, and looked for the zero crossing of the AS_A_RF36.  We did this by turning of either MICH or SRC1 ASC and then we changed the BS/SRM alignment and looked for a zero crossing in the relevant AS_A_RF36 signal.  This did not look promising, and we couldn't find a zero crossing at a good alignment for any degree of freedom except for SRM pitch/AS_A_RF36_I_YAW. 

With that we are leaving this task for today, untill we think of a smarter way to rephase the AS_A_RF36.