Camilla C, TJ S
The two corner station HWS SLEDs were last swapped back in October 2023 (alog73371), going a bit long than our usual ~1 year before swapping. Today we swapped them with fresh SLEDs following the T1500193 procedure, calibrated their power channels, and started the code back up with fresh references.
HWS starting values
Power as measured from fiber launcher: IX 480uW IY 180uW
Power reported into epics: IX: 1.88 IY: 0.36
SLEDs removed:
X - https://ics.ligo-la.caltech.edu/JIRA/browse/QSDM-790-5--00-11.21.380
Y - https://ics.ligo-la.caltech.edu/JIRA/browse/QSDM-840-5--00-03.20.479
HWS ending values
SLEDs installed:
X - https://ics.ligo-la.caltech.edu/JIRA/browse/QSDM-790-5--00-11.21.382 2.5mW = 165mA = 660mV (on TP with 250mA/V) Max current set to 155mA
Y - https://ics.ligo-la.caltech.edu/JIRA/browse/QSDM-840-5-0-00-06.18.005 2.5mV = 100mA = 400mV (on TP with 250mA/V) Max current set to 95mA
Power measured at fiber launcher: 2.2mW for both
To calibrate the H1:TCS-ITM{X,Y}_HWS_SLEDPOWERMON channel, we turned off the SLEDs, found the dark offset, turned the SLED back on, and then changed the gain. These values are in the SDF screenshots attached.
