Sheila, Begum, Keita, Camilla

We followed 80010 to set up, additionally Sheila had us stop the OMC ASC and DC centering loops before running the scan. We moved SRM in Pitch to center beam on AS AIR camera. Cheated the dark offset via adding an offset to H1:OMC-DCPD_SUM_OFFSET.

Started with 1.1mW on SQZt7 IR PD1.06mW on AS_C, 74 and 75 on AS_A and AS_B, 1.06mW on OMC_A and 0.82mW on OMC_B. We were seeing the OMC diodes saturating (via H1:OMC-DCPD_A_WINDOW_EXCEED and H1:OMC-DCPD_B_WINDOW_EXCEED), the same was true after increasing scan length to 200s and reducing SEED input power form 75mW to 50mW in, we checked this did not happen in September 86965. We also turned down the purge air in HAM7, again, did not help.

We tried locking the OMC with the SQZ beam and were unable. 

We did not saturate the PDs with SEED power down to 25mW but the peaks were noisy at the beam was moving and the mis-alignment peak was too large. We got an upper limit of 10% mode mismatch, which is not useful, attached.

We looked back at January data, should be very simular and although the misalignment is bad, the lower limit on modemamthcing is 1.18%, which is very good. See 90598