[Dsg-mvt] MicroMegas gas

[Volker Burkert]

Amrit, 
thank you for your foresight! 
I still hope that we won't need to use them. 
Never give up hope!
Volker



----- Original Message -----
From: "Amrit Yegneswaran" <yeg at jlab.org>
To: "dsg-internal" <dsg-internal at jlab.org>, "burkert Burkert" <burkert at jlab.org>, "Maxime Defurne" <mdefurne at jlab.org>, "Bob Miller" <rmiller at jlab.org>, "dsg-mvt" <dsg-mvt at jlab.org>
Cc: "Dr. Rossi Patrizia" <rossi at jlab.org>
Sent: Tuesday, January 9, 2018 1:10:54 PM
Subject: Re: [Dsg-mvt] MicroMegas gas

these ten and twenty cylinders of gas were an estimate i made and asked george and marc respectively to buy, prior to the xmas break. 
my good deed for xmas. 

per maxime's 3.5 days /cylinder this quantity of gas should be adequate. 

if the flow rates change/the run is extended and more gas needs to be procured, the MVT group should inform dsg-mvt at jlab.org with adequate lead time, so that george/marc can buy them in a timely fashion. 

the lead time for the gas is 6-8 weeks. 




From: "George Jacobs" <jacobsg at jlab.org> 
To: "burkert" <burkert at jlab.org> 
Cc: "Maxime DEFURNE" <maxime.defurne at cea.fr>, "rmiller" <rmiller at jlab.org>, dsg-mvt at jlab.org 
Sent: Tuesday, January 9, 2018 11:43:35 AM 
Subject: Re: [Dsg-mvt] MicroMegas gas 

Hi Volker, 

The current MVT gas mixing system layout may be problematic for temperature control of the C4H10 gas. In order to supply isobutane at high enough pressure for the MFCs to work, it must be heated along with all components it comes into contact with. Obviously, the lower the ambient temperature, the more likely there will be a component that causes the gas to condense. 

The best long term option would be to redesign the MFC layout in a manner prioritizing the heating and insulation of the components. 

For the short term, operation with pre-mix gas looks to be the solution. There is one cylinder of pre-mix remaining at the 96B gas pad. 

George 

On 1/8/2018 8:49 PM, burkert wrote: 


Hi George, 

Do we have a solution for running the MM during the next part of the run? If we can't get the mixing system in the gas shed and transport to the hall to function properly can we go back to the operation with premixed gas from bottles in the Hall? 

As you know we ordered 10 premix bottles and additional 20 are also in the system. This should be enough to run the entire period until March 22 with premix gas from the Hall (if needed). 

Volker 





-- 
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606

(office) 757-269-7115

(cell)   757-876-0480

(email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg 

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