[Dsg-rtpc] [EXTERNAL] Gas fittings for the BONuS12 DMS

[Bob Miller]

Hi Sebastian,

1) Krister and Brian will be working on the gas panel cabling on Monday.  When the cabling is complete, we can bring the gas panel to the Hall on Tuesday or Wednesday, if the Hall is still open.  We should be able to test the gas panel in one shift and have it back in the EEL at the end of the day.

2) Brian will respond.

3) As far as I know, the gas supplied to RTPC 1 and 2 has not returned to the gas panel.  Therefore, there is no flow through the DMS.  At what point do you want to move the DMS to the mixed gas supply line?

Regards,
Bob

________________________________
From: Sebastian Kuhn <kuhn at jlab.org>
Sent: Friday, January 3, 2020 11:58 AM
To: Bob Miller <rmiller at jlab.org>
Cc: Mohammad Hattawy <mohammad.hattawy at gmail.com>; JIWAN POUDEL <jpoud001 at odu.edu>; dsg-rtpc at jlab.org <dsg-rtpc at jlab.org>; Nathan Baltzell <nbaltzel at odu.edu>; Carlos Ayerbe Gayoso <gayoso at jlab.org>
Subject: Re: [Dsg-rtpc] [EXTERNAL] Gas fittings for the BONuS12 DMS

Dear Bob and all,

first of all, Happy New Year - it will be an exciting one for our experiment.
I wanted to ask two questions:

1) What are the present plans for taking the existing gas panel from the EEL to the Hall? I remember that there was talk about testing out connections in the Hall sometime next week before RGB comes back online. I don’t know exactly where the accelerator folks are with beam restoration, but it is my understanding that this could already happen towards the middle of the week. In any case, as you know, we depend on the gas panel for tests in the EEL and would like to minimize the time without it, so it would be helpful to have a plan on what will happen when.

2) Is there a possibility to add one more item to the gas panel? (rather belated, I know - my apologies) I realized that we really would like to be able to measure the differential pressure between the 4He gas buffer volume  (orange in the gas panel design drawings) and the RTPC (green). This would
a) close the loop so we have both absolute and relative pressure for all relevant parts of the system
b) allow us to monitor (and alarm on) any pressure differential between the RTPC and the buffer volume that exceeds the (rather limited) safety margin for the thin ground foil between the two.

I have made a crude addition to the drawing to show where this differential pressure meter would go (see below, in heavy red lines). In addition to two more “T’s” that would have to be integrated into the existing lines, this would also require of course that we have a spare for such an instrument, and it would have to be added to the LabView and EPICS panels. Is this feasible?

Thank you, and best greetings - Sebastian

[cid:B2F02CB3-EDE6-4D09-9BEE-6927C5296D58 at wlan.odu.edu]

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