Reports until 17:14, Monday 22 April 2019
H1 ISC (IOO, ISC, SEI)
corey.gray@LIGO.ORG - posted 17:14, Monday 22 April 2019 - last comment - 08:47, Tuesday 23 April 2019(48673)
SDF Diffs For: MC2 Offset, ALS Motorized Polarization Controller, & ISI EY TRamp

Made it to NLN & handful of SDF diffs.  Went through the diffs while PEM injections were going on. 

1)  H1:SUS-MC2_M1_DRIVEALIGN_L2L_SW1R was saved in a wrong state with this OFFSET "on". 

(Note:  Jenne gave guidance about this channel.  It is avail to turn "on" if we are having trouble locking the IMC & want to give it a little bump to help locking.  But we should remember to turn this "off" as soon as the IMC locks.  So this must have been Accepted when it was accidentally left "on".  Anyway, tonight this offset was in the correct "off" state, and had the diff, so we ACCEPTED.  Jenne fixed this issue for the future by adding a line in ISC_LOCK to turn OFF this offset--I believe she said in the PREP_FOR_LOCKING state.)

2) ECAT PLC1 Had Diffs (SDF diffs screenshot #1 attached) Due to ALS Remote Motorized Polarization Controller (medm screenshot #2 attached)

Not really sure why we're monitoring these channels (i.e. the Paddle X, Y, & Z channels) because these channels change whenever we make remote polarization changes.  So, I unmonitored these three channels.

3) SPM Diff for TRamp for ISI EY

For some reason the Stage 2 Rx & Ry TRamps were 0 and SPM had a set point of 5.  Since this is benign, I changed the TRamps to 5, but this then gave us new SDF diffs---which I ACCEPTED.

Images attached to this report
Comments related to this report
daniel.sigg@LIGO.ORG - 08:47, Tuesday 23 April 2019 (48692)

As for the polarization controller: These channels should be monitored and updated when the polarization is adjusted. Keep in mind that when you turn the controller on, you loose the last value and have to restore it! Set them back to monitoring.