Reports until 12:46, Tuesday 12 May 2015
H1 PSL (PSL)
sudarshan.karki@LIGO.ORG - posted 12:46, Tuesday 12 May 2015 (18381)
PSLISS model changes

SudarshanK, DaveB, JeffK,

We made changes to psl iss model to include the DC signal from the eight photodiodes on the array.  These  DC signals are acquired before the whitening in the transimpedance amplifier. This psliss model restart  didnot affect the psl itself, which we were afraid it might. Good to know for future restartts. The DAC restart was made around 11:30 local time. These 8 additional channels will be available to  trend via epics channel. These signals are also used to normalize the ISS PD signals to obtain the RPN.  The channel names are as follows:

H1:PSL-ISS_SECONDLOOP_PD1_DC

........

H1:PSL-ISS_SECONDLOOP_PD8_DC

Attached is the new front end model that includes the changes.

Images attached to this report