[Dsg-rich] [Dsg-internal] RICH N2 and Air modifications

[Amrit Yegneswaran]

thanks for the info marc. 


From: "Marc Mcmullen" <mcmullen at jlab.org> 
To: "dsg-internal" <dsg-internal at jlab.org> 
Sent: Monday, November 20, 2017 4:32:25 PM 
Subject: [Dsg-internal] RICH N2 and Air modifications 

Hi Amrit, 

I just spoke with Marco Mirazita. Currently, they are running both air 
and N2 while they are testing the lower flow limit (N2 @ 20slm) to see 
the effect on humidity, after the humidity settles they plan to lower 
the flow even more and test. 

George has started pre-assembly for installation of the new filter for 
N2 and 2 more lines for dewar connection. To complete these 
modifications we will have to stop flow and de-pressurize the system. So 
we will have to do this once they are done testing. 

Marco told me that they will not be able to install the Aerogel this 
week, he is says he needs to confirm this with Marco C. But he told me 
there was no need to run N2 over the long weekend. Marco also says they 
are going to discuss closing off the air exhausts to help with the N2 
leak through the e-panel as part of the testing. 

In any event, we are preparing for the modifications. We have 2 dewars 
online, 2 dewars on deck, and 2 dewars on order. 

Walt is adding Room 124 and 125 to the "do not kill power" list for the 
holiday shutdown, and he has reached out to Carrol Jones about the 
temperature change. 

Thanks, 

-- 
Marc McMullen 
Detector Support Group 
757-269-7738 

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