peter.king@LIGO.ORG - posted 06:57, Friday 02 September 2016 - last comment - 09:48, Friday 02 September 2016(29459)
laser trip
Attached is a capture of the PSL's TwinCAT status screen. Same problem as previously, namely a flow error in the
AMP cooling circuit.
In bring the laser back up, I took the opportunity to reboot h1pslctrl0. This has temporarily fixed the problem
with the diode current readout of diode box 3.
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Attached are zoomed in plots of the flow rates and pressures. Note an oscillation is present in the flow rate
signals, which might be indicative of something "flapping" in the water flow. A plot of the laser head flow
rates is also attached. The flow through the laser heads is not the problem, at least not this time.
In looking at the pressure fluctuations, it looks like they start in the inlet side before appearing
in the outlet side. Both have appear to have a period of 1s, although this might be an artifact of the
sampling/recording of the trend data.
A quick visual inspection of the filters in the chiller room didn't reveal any new debris.
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