[Sbs_gems] [EXTERNAL] Re: Argon/Carbon Dioxide gas cylinders to move to to gas shed 90A

[John Boyd]

I went to grab some gas from 90A and I realized that of the 6 cylinders we
moved into 90A on Friday, only 2 of them were pre-mix. The other 4 were
pure Argon. I'm hoping that there are still 4 pre-mix cylinders over at
Hall A and that these 4 argon bottles were brought just accidentally in
place of them.

Please let me know how to confirm this and proceed.

Best,

John

On Thu, Dec 2, 2021 at 6:24 PM Brad Sawatzky <brads at jlab.org> wrote:

> I moved six 75:25 premix cylinders to the EEL gas racks this afternoon.
> There are another 2--3 premix cylinders in EEL/125.  That is perhaps
> ~2 weeks worth of gas for the SBS GEMs -- probably enough to cover
> December.
>
> I don't think there are any more (useful) premix bottles in the Hall A
> racks.  Those that are left are partials -- I checked a few of them and
> they only have 400--500psi in them.  Hardly worth the effort to move
> them given the GEM gas consumption rate.
>
> * Holly or Jack:  I will leave it you two to coordinate and purchase
>     more premix if needed.  I think we all got the recent email from
>     Purchasing that the (official) lead-time is now 21 days for most
>     premix.  If we want premix gas for January, we should probably
>     order ASAP.  (Unless there are orders that just haven't shown up
>     yet?)
>
> The current plan is to switch to nitrogen over the holiday break.
> That may require one person to come on-site at the end of Dec to swap a
> bottle.  John will contact Mark, et to ensure at least he and one other
> GEM expert are on the 'Holiday access list' so they can take care of
> this.
>
> -- Brad
>
> --
> Brad Sawatzky (he/him), PhD <brads at jlab.org> -<>- Jefferson Lab/ Hall
> C/C111
> Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
> The most exciting phrase to hear in science, the one that heralds new
>   discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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