Sheila, Jennie, Camilla

Now Jim has locked HAM5/6 HEPI and isolated ISI's (to be similar to when vented and locked), we recreated the IFO single bounce and SQZ alignments onto AS_C for the recent bad OFI spot and the April OFI bad spot. Used template/ligo/home/camilla.compton/Desktop/SRC_OMC_align.yaml

This should simplify setting alignment references once vented.

July bad OFI spot (alignment used May-July):

• SQZ to AS_C: (SQZT7 irises set to this alignment 79178), compare to scopes from 79128.
  • This was strange as with the same alignment (+1urad SRM and ZM6) we were off-center on AS_C and had nearly double the power on AS_C_SUM 0.21mW today vs 0.12mW on Monday.
  • Although strange we can;t recreate the alignment without large ZM/SRM changes, we aren't too worried about this as still see throughput and loss on AS_C.
  • Time of alignment (ZM4,5,6, SRM, PSAMS): 2024/07/17 20:18 to 20:23 UTC plot
  • ITMs misaligned and 1.3mW SQZ beam.
• IFO 10W single bounce to AS_C:
  • Used the "before" 2024/07/14 00:39UTC time in the IFO single bounce Ryan had in 79135 with the alignment of the last good lock, plot.
  • Centered on AS_C, power measured ~10% less than at Ryan's time
  • Time of alignment: 2024/07/17 21:07 to 21:10 UTC plot
  • Aligned ITMY, SR2, SR3. Misaligned ITMX, SRM.

April bad OFI spot (alignment used pre-April):

• SQZ to AS_C:
  • Did not repeat this as it would mean changing the PSAMs, would prefer to leave alone and keep current alignment.
• IFO single bounce AS_C:
  • Compared to Jenne's 21 Apr 2024 20:08UTC time from 77690, plot. ITMY and BS in similar position.
  • Put SR3 back to osem values and moved SR2 to center on AS_C.
  • Measured 0.017 on AS_C_NSUM, this is ~10% lower than measured after the April loss.
  • Time of alignment: 2024/07/17 21:39 to 21:40 UTC plot
  • Aligned ITMY, SR2, SR3. Misaligned ITMX, SRM.