gabriele.vajente@LIGO.ORG - posted 13:37, Friday 24 April 2015 (18054)
Beam recentered on ISS diodes
I realigned the beam into the ISS array. The QPD signals are close to zero.
For reference, here are the DC values read by the slow signals for 3.3W input power:
| PD1 | IOP-PSL0_MADC1_EPICS_CH24 | 1247 |
| PD2 | IOP-PSL0_MADC1_EPICS_CH25 | 1370 |
| PD3 | IOP-PSL0_MADC1_EPICS_CH26 | 1346 |
| PD4 | IOP-PSL0_MADC1_EPICS_CH27 | 1487 |
| PD5 | IOP-PSL0_MADC1_EPICS_CH28 | 1506 |
| PD6 | IOP-PSL0_MADC1_EPICS_CH29 | 1400 |
| PD7 | IOP-PSL0_MADC1_EPICS_CH30 | 1625 |
| PD8 | IOP-PSL0_MADC1_EPICS_CH31 | 1504 |
I didn't check the jitter to RIN coupling as we did in the past, so the alignment might not be the optimal one yet.
In addition, it seems that PD8 has some problems, since the spectrum is clearly noisier.
Images attached to this report
