peter.king@LIGO.ORG - posted 16:34, Friday 23 November 2018 - last comment - 16:40, Friday 23 November 2018(45471)
PSL chiller flow rates
Attached is the trend data plot for the flow rates in the power meter circuit, the front end laser, and the 70 W amplifier.
Lots of glitches, not sure of the reason why. Especially when compared to the 70 W amplifier cooling circuit.
The diode chiller is indicating an error message of "F3-error", which is something related to the hot gas valve. That
might be an indication that the diode chiller needs servicing, I don't know. The diode chiller temperature over the same
period of time looks pretty constant at 20 +/- 0.2 degC. The diode chiller flow looks pretty constant over the same time
interval as well.
The flow rate from the crystal chiller is noticeably lower upon restart. 14 lpm cf. 15.7 lpm.
After restarting the laser, the power meter flow somewhat regularly flashes red indicating that the flow rate has
dropped to 0.5 lpm or lower.
Images attached to this report
Comments related to this report
Attached is the data dump from TwinCAT. In some stretches one can see some ripples before the flow rate
drops to zero. These small fluctuations might be air bubbles making their way through the system. The
drop outs occur with enough regularity that we ought to be able to test whether it's the EL3054 analogue
input terminal being intermittent or if it really is a flow rate problem.
The alternate is that perhaps the connections in the junction box might be loose, although unlikely
I would think.
Images attached to this comment
