[Sbs_gems] [EXTERNAL] Re: [New Logentry] Goodnight Gas Shed

[Xinzhan Bai]

Hi Zeke,

I think we have implemented a function: when the gas ratio is off, HV will
be turned off automatically. Did this function work, or is it useful?
Thanks.

Best,

Xinzhan

On Mon, Feb 27, 2023 at 9:55 PM ewertz--- via Sbs_gems <sbs_gems at jlab.org>
wrote:

> Goodnight Gas Shed <https://logbooks.jlab.org/entry/4140465>
>
>    - Edit
>    <https://logbooks.jlab.org/entry/4140465/edit?destination=email/send>
>    - Delete
>    <https://logbooks.jlab.org/entry/4140465/delete?destination=email/send>
>
> Lognumber 4140465 <https://logbooks.jlab.org/entry/4140465>. Submitted by
> ewertz <https://logbooks.jlab.org/user/ewertz> on Mon, 02/27/2023 - 21:52
> <https://logbooks.jlab.org/entries?start_date=1677549146&end_date=1677556346&book=HALOG>.
>
> Logbooks: HALOG <https://logbooks.jlab.org/book/halog>
> Entry Makers: ewertz
>
> 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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