[Sbs_gems] [New Logentry] Goodnight Gas Shed

[ewertz at jlab.org]

Logentry Text:
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So around 23:00 yesterday there was an alarm for the BBGEM gas shed mix ratio. Somehow it got silenced and the GEMs filled up with only CO2. This is not great because there is no ionizer. But is ok from a safety standpoint cause CO2 is a quencher. So HV was not harmed. Holly and I realized this right before we were taking optics data. Figured out that somehow the system got bamboozled because there were 2 full cylinders of Argon on the line. But 1 cylinder was not opened so the system just stopped accepting Argon. Pretty weird behavior. Now we have opened up the Argon ad purged the line to get it back to the proper mix ratio. See https://logbooks.jlab.org/entry/4140460 for picture of plot of gas ratio over time as proof.

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