camilla.compton@LIGO.ORG - posted 10:59, Tuesday 27 February 2024 - last comment - 15:23, Tuesday 27 February 2024(75997)
TCS CO2 and HWS lasers turned back on
HWS and CO2 lasers turned back on this morning. I swapped the HWS camera power supply cabling back to the "quieter" ungrounded verison (75876).
CO2Y came back with less power than expected (388W when we had 42W before the break), TJ and I increased the temperature step point and we now have 40.6W out of the laser head. Plot attached. We might think about slowly stepping the temperature to see if we can find a better operating point.
This is not worrying: in 65277 we show can inject ~16% of power out of laser into the vacuum through the annular mask. Expecting we continue observing with 1.7W, we only need ~10W from the head.
TJ and I restarted HWS code on both ITMX and ITMY with camera frequency 1Hz for X, 10Hz for Y (lowest frequency that doesn't saturate pixels).
New references taken. Ring heaters are at their nominal settings, 0.44W/segment on ITMX, 0W on ITMY.
We had to restart h1msr1 and try starting the code multiple times to avoid a segmentation fault in ITMY. We checked the wave fronts and removed a bad pixel from ITMX. ITMY crashed after running for ~10 minutes, we restarted it but we should check on it later.
Attached is the HWS plot of the location of CO2Y.