[Esr-users] CHL / ESR Helium Losses

[Steve Lassiter]

Hall C's cryo system has been checked and all systems are normal.

Steven

----- Original Message -----
From: "Nusair Hasan" <hasan at jlab.org>
To: "Cryo" <esr-users at jlab.org>
Sent: Tuesday, January 2, 2018 9:21:03 AM
Subject: [Esr-users] CHL / ESR Helium Losses

Attached is a plot of combined CHL1 (LHe Dewar, Gas Tanks) and ESR (LHe Dewar, Hall cryostats) helium inventory for the winter break period. 

- During the first week of the winter break combined loss rate was ~ 180 liter/day. This data matches up with known loss rates from the two systems (combined). 

- During the second week of the winter break (28-Dec-17 onwards) combined loss rate was ~ 280 liter/day. This 100 liter/day increase aligns with the time the ESR LHe dewar liquid level started depleting. Clearly, not all the helium from the ESR dewar is returning to the CHL gas tanks. 



Please check your systems / equipment at the experimental halls for any sign of leak. Cryo personnel is actively checking the cryo-plant (ESR) for potential leaks. 



Thanks, 

Nusair 



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