[Esr-users] [New Logentry] Follow-up Re: Hall B Magnet and Dewar Cooldown

kashy at jlab.org kashy at jlab.org
Wed Jul 18 05:20:03 EDT 2018


Logentry Text:
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Torus is cooling at 5K/hr and Solenoid is cooling at 1.5K per hour. These are as basically expected, because the heat transfer area of the Torus is much bigger than the Solenoid. I have increase the JT to the Buffer Dewar EV8210 from 14% to 20% to get it to start to cool and the JT to the Solenoid Lead Reservoir EV8611JT from 15 to 20 % to get it to start to cool. IF we can get some liquid in Solenoid Lead Reservoir, the Buffer Dewar and the Torus then we can go to cold return and slowly cool the Solenoid coils. This will greatly reduce the load on the ESR such that more capacity will available for Hall C cooldown. 

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