Displaying report 1-1 of 1.
Reports until 17:05, Friday 08 June 2018
H1 PSL
gabriele.vajente@LIGO.ORG - posted 17:05, Friday 08 June 2018 (42416)
ISS second loop array centered

Centered the ISS second loop array, using picomotor 1. The QPD signals were zeroed, and in that state all PD powers were high and quite similar. See first attached plot.

 

For reference, the typical power levels measured before are (18054)

    Old New
PD1 IOP-PSL0_MADC1_EPICS_CH24 1247 10167
PD2 IOP-PSL0_MADC1_EPICS_CH25 1370 10179
PD3 IOP-PSL0_MADC1_EPICS_CH26 1346 11333
PD4 IOP-PSL0_MADC1_EPICS_CH27 1487 10434
PD5 IOP-PSL0_MADC1_EPICS_CH28 1506 11467
PD6 IOP-PSL0_MADC1_EPICS_CH29 1400 10640
PD7 IOP-PSL0_MADC1_EPICS_CH30 1625 12345
PD8 IOP-PSL0_MADC1_EPICS_CH31 1504 11525

Note that the normalization of the signals might be different, as well as the input power, so only the relative differences are important. The distribution of power levels is comparable with the old measurements.

 

With the IMC offline, measured and retuned the dark offsets:

H1:PSL-ISS_SECONDLOOP_PD1_INMON 507.360238647
H1:PSL-ISS_SECONDLOOP_PD2_INMON -0.477651876211
H1:PSL-ISS_SECONDLOOP_PD3_INMON -4.05748717785
H1:PSL-ISS_SECONDLOOP_PD4_INMON -4.37042988539
H1:PSL-ISS_SECONDLOOP_PD5_INMON 0.0666494309902
H1:PSL-ISS_SECONDLOOP_PD6_INMON -0.540560656786
H1:PSL-ISS_SECONDLOOP_PD7_INMON -1.43365537077
H1:PSL-ISS_SECONDLOOP_PD8_INMON -0.803998035192

They're all normal, except for PD1 which has a very large offset.

Images attached to this report
Displaying report 1-1 of 1.