Input Arm alignment pointing for the HAM2 an HAM3 suspensions was re-checked after corner pumpdown. Since HEPI is locked currently, we wanted a time pre-venting where HEPI is also locked in order to be able to compare. I used the pointing values which follow the format: H1:SUS-{suspension}_M1_DAMP_{P or Y}_INMON.
HAM HEPIs LOCKED and CORNER (except HAM1) UNDER VACUUM - GPS TIME: 1427710424
| Suspension | Before Venting (urad) | After Vent and Pumpdown (urad) | Difference |
| IM1 P | 3133.6 | 3073.2 | -60.4 |
| IM1 Y | -682.8 | -675.5 | +7.3 |
| IM2 P | 903.2 | 723.0 realigned to 903.0 | -180.2, -0.2 |
| IM2 Y | -211.6 | -228.1 realigned to -210.9 | -16.5, +0.7 |
| IM3 P | 135.5 | 166.8 | +31.3 |
| IM3 Y | -1585.5 | -1597.4 | -11.9 |
| IM4 P | -2857.8 | -2882.3 realigned to -2858.2 | -24.5, -0.4 |
| IM4 Y | -44.6 | 212.5 realigned to -44.0 | +257.1, +0.6 |
| PRM P | -1272.7 | -1255.0 | +17.7 |
| PRM Y | -31.9 | -30.7 | +1.2 |
| PR2 P | -398.1 | -386.3 | +11.8 |
| PR2 Y | -1216.6 | -1208.4 | +8.2 |
| PR3 P | -655.4 | -657.1 | -1.7 |
| PR3 Y | -166.8 | -166.3 | -0.5 |
| MC1 P | -646.9 | -667.8 | -20.9 |
| MC1 Y | -1381.0 | -1378.2 | +2.8 |
| MC2 P | 785.6 | 737.6 | -48 |
| MC2 Y | -383.9 | -382.7 | +1.2 |
| MC3 P | 451.4 | 460.1 | +8.7 |
| MC3 Y | -179.2 | -179.3 | -0.1 |
Most of these are very close and do not need to be adjusted, with only 2 being different by over 100 microradians. 45% of values have less than 10urad discrepancy. 85% have less than 50urad discrepancy. After speaking with TJ, I realigned two most egregious ones IM4 Y, and IM2 P to their pre-vent (HEPI Locked) values using the OPTICALIGN sliders. Screenshots below of plots used further show the pointing as well as the old to new value differences of the two suspensions that were aligned. After alignment, all values are under 100urad discrepancy and 95% are under 50urad difference.
