aLIGO LHO Logbook

H1 IOO

daniel.sigg@LIGO.ORG - posted 11:41, Tuesday 03 February 2015 - last comment - 10:35, Thursday 05 February 2015(16437)

Power readbacks after EOM and at periscope

(Peter K, Richard M, , Filiberto C, Daniel S)

We noticed that the fast channels corresponding to H1:IMC-PWR_IN and H1:IMC-PWR_EOM were never hooked up. This required installing the PD interface box in the PSL enclosure, running the DAQ cable into the PSL and installing a tee in the photodetector readback. (These channels have previously been hooked up to the EtherCAT system, so they that they are available to the rotation stage.) The EOM channel is currently railed and needs an adjustment of the PD gain.

EPICS updates:

Added buttons for these channels to the IMC overview screen.
Fixed the screen for the PSL rotation stage in the sitemap.
Added rotation stage button to the IMC overview screen.

Comments related to this report

kiwamu.izumi@LIGO.ORG - 10:35, Thursday 05 February 2015 (16487)PSL

Link

Another update:

I have put a filter in IMC-PWR_IN in order to calibrate the signal into watts. I used the slow readback (i.e. H1:PSL-PERISCOPE_A_DC_POWERMON) as a reference for the calibration such that IMC-PWR_IN matches to the slow one. So now the filter bank looks like this:

Images attached to this comment