[Dsg-hallc_nps] NPS temperature reading jumps

[Carlos Munoz Camacho]

Hi Aaron,

   I think it is hard to know if additional shielding or replacing the
mainframe would solve the issue. It can certainly help, but we will not
know for sure until we try.

However, I don't think we want to do any of that before the holiday. For
the time being, I would first like to confirm if rebooting the frame
actually fixes the problem. If you can provide us with a way for us to do
it, we can set a script to alert us when these jumps happens. Then we can
go ahead, do a reboot, and check if the jumps are "recovered".

Thanks,
Carlos

On Tue, Nov 21, 2023 at 4:13 PM Aaron Brown <ambrown at jlab.org> wrote:

> Hi Carlos and Julie,
>
> One more thing.
> Would adding additional shielding around the mainframe be a solution?
> Or should we swap in the spare mainframe if we think the current one is
> too damaged?
>
> Best,
> Aaron
> ------------------------------
> *From:* Dsg-hallc_nps <dsg-hallc_nps-bounces at jlab.org> on behalf of Aaron
> Brown via Dsg-hallc_nps <dsg-hallc_nps at jlab.org>
> *Sent:* Tuesday, November 21, 2023 10:11 AM
> *To:* Carlos Munoz Camacho <munoz at jlab.org>; Julie Roche <jroche at jlab.org>
> *Cc:* yaopeng <yaopeng at jlab.org>; Dsg-hallc_nps at jlab.org <
> dsg-hallc_nps at jlab.org>
> *Subject:* Re: [Dsg-hallc_nps] NPS temperature reading jumps
>
> Hi Julie and Carlos,
>
> If rebooting the mainframe is the solution we would like to move forward
> with, I can try writing some code to do so every 2 or 3 days. However, when
> we reboot the mainframe we also have to restart the LabVIEW program, so
> I'll need to figure out if there is a way to do this automatically. I'll
> discuss it with my team and get back to you.
>
> Best,
> Aaron
> ------------------------------
> *From:* Carlos Munoz Camacho <munoz at jlab.org>
> *Sent:* Tuesday, November 21, 2023 3:14 AM
> *To:* Julie Roche <jroche at jlab.org>
> *Cc:* Aaron Brown <ambrown at jlab.org>; yaopeng <yaopeng at jlab.org>
> *Subject:* Re: NPS temperature reading jumps
>
> Hi Julie, all,
>
>    my assumption (initially suggested by D. Mack) is that this is due to
> radiation causing some bit flips in the ADC readout. It seems that
> rebooting the mainframe resets things, so it would be good to do it after
> this happens to confirm. Also, to prevent this from happening in the
> future, it may be a good practice to reboot the mainframe periodically
> (every 2-3 days?).
>
> Best,
> Carlos
>
> On Tue, Nov 21, 2023 at 2:50 AM Julie Roche <jroche at jlab.org> wrote:
>
> Hi Aaron
>
>
>
> Tonight, I’m staring at the temperature readings for the NPS calorimeter.
> There are the unphysical jumps that Carlos mentioned to me (and possibly to
> you) a few days ago.  Like in this entry:
> https://logbooks.jlab.org/entry/4223498
>
>
>
> What is that due to? Could it be that your readings are slipping?  By
> this, I mean, it seems that when there is a sudden jump, color lines get
> switched. For example, in the picture below at 2023-11-20 at 9 am, it looks
> to me that the pink becomes light green, the light green becomes dark
> green, and the dark green becomes blue.
>
>
>
> Julie
>
>
>
>
>
> matches an old color[image: A screenshot of a graph Description
> automatically generated]
>
>
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