Dan, Danny, Alexei
Tonight we powered up the SR3 heater again to 0.5W5W, we took a cal sweep before and after and can see it actually has a reasonable change (red with SR3, blue before SR3).
Once we had thermalised we tried some common CO2 increases, it didn't made a small improvement in PRG and arm power at the start but it didn't help with much more. I then zeroed CO2Y and dropped CO2X steadily to 0.2W. The range stayed fairly constant throughout all this but the arm powers and PRG got worse for most CO2 changes. I was adjusting the SRC1 offsets to try and maximise the cavity pole as we went along, there were some CO2 values giving higher kappa_c for the same cavity pole frequency.
The SR3 heater has been switched off and the CO2s have been set back to nominal. SRC1 offsets set back to zero. We're sat ~96Mpc up from 88Mpc before SR3, although given the calibration change I'm not sure what this range increase actually ends up being.
All this work was done from 1236673000 to 1236690900 if people are looking through the data during this time.
And as soon as we stood up to leave we had a lock loss. There doesn't seem to be any obvious culprit for it.
I did a rough rescaling of DARM from the pcal sweeps above and recomputed the range. Doing this we go from 96.4 to 98.3 Mpc with the SR3 heater on.