After switching on the CHRoCC on PR at 0.6 V on the DAC (to give the right curvature 56597), and with PR RH off, we optimized the matching on the west arm by moving the L1 lens on SIB1 along z and the counter weight to keep the corrections Sc_IB_MAR_TZ_CORR in the range (as usual).
The first measurement of the mismatch gave us 18% for the North arm and 12% for the west. We then performed the steps summarized in the following table
| scan # | GPS UTC | actuator | number of steps | direction |
| 1 | 11:50 | |||
| 2 | 12:48 | L1z | 20000 | backward |
| 3 | 13:18 | - | 50000 | forward |
| 4 | 13:42 | - | 60000 | - |
| 5 | 14:02 | - | - | - |
| 6 | 14:25 | - | 40000 | - |
| 7 | 15:18 | - | 20000 | - |
| 8 | 15:43 | - | - | - |
| 15:47 | CW | 60000 | forward | |
| 16:17 | L1z | 20000 | forward | |
| 9 | 16:44 | - | - | - |
| 10 | 17:10 | - | - | - |
| 11 | 17:30 | - | 30000 | - |
| 12 | 17:45 | - | 30000 | - |
| 18:13 | - | 60000 | backward |
The mismatch for the west arm is now around 1.3% and for thee north 2% (see attached plot).
