[Esr-users] Hall Cryo Status?

[Dave Kashy]

Hi Steve etal,

Below is the current plan that we should all baseline to. It was discussed at the Physics Division Senior Staff meeting today. If anyone has issues with this please let me know. 
Thanks 
Dave


Hall A,
All magnets full and ready to run

Hall B
Torus at 63K and Solenoid at 57K, buffer dewar empty

Hall C
All magnets full and on cold return.

Recent problems
Hall C had a 300K helium line leaking into the 4K circuit. This was discovered and resolved.
Hall C had a valve fail on one magnet in the full open position. This was discovered and manually resolved, and it the group is working on more permanent solutions.
Hall B ESMTL (End Station Magnet TL = transfer line to the Hall B vacuum spoiled upon warming and has been pumped back down.

Plan
Today: Perform an ESR/Halls A/C load and capacity test with Hall B off line
This afternoon: Start 4K supply to Hall B to cool the TL's
Wednesday and Thursday : Cool and Fill Hall B magnets and dewar
Friday and Saturday: - contingency
Sunday 3/18 : - shut off CHL flow to ESR and Pump the South Linac with CHL1 to 2K
Monday 3/19 : Cool the TL and recover Hall Magnets if needed
Tuesday/Wednesday 3/20-21 : Cool the cryotargets in Halls A/B/C to assure all is ready for beam when it arrives

----- Original Message -----
From: "Steve Suhring" <suhring at jlab.org>
To: "kashy" <kashy at jlab.org>
Sent: Tuesday, March 13, 2018 9:03:31 AM
Subject: Hall Cryo Status?

Hi, Dave, 

Would you please provide simple statements on the cryo status for each Hall. We are interested in getting this important step understood. If recovery goes well, we'd like to be ready all around. 

Steve 

Something like: 

Hall A - Rt. arm magnets ready for operations. L arm Q2 warm due to a vacuum problem. Anticipated cooldown Friday with full operational status by Tuesday. Target cooldown remains. Needs to start 3 days before 1st beam into the Hall. 

Hall B - etc.