[Esr-users] ESR Restart update

[Dave Kashy]

Hi All,

This morning I got word that ESR purification has started. This is a big step in getting 4 kelvin helium flowing.
The current plan is to have 4K available for Hall C cooldown on Monday July 16. This is 2 weeks and 2 days ahead of August 1 which was the date that was discussed and documented in the attached report. I hope that the cryoguys will keep us all informed of the progress on the refrigerator restart so that we know if there are any changes.

Monday July 2 there will be a loss of Recovery Compressors for 2 days. The system should be back up Tuesday afternoon on July 3. To keep the 3 Halls positive pressure we (cyro and I) will configure the system such that the warm returns are pressurized by Hall B only. All 4 atm helium will be shut off to Halls A and C and Hall B will be used as the regulator to provide the other halls with pressure. I will shoot for 1.2 atm on the warm returns and I'm quite confident that this will work well. Once this is setup doing drop tests on each Hall should be quite easy by isolating the warm returns for short periods of time.

Halls Status:

Hall C: Has a nitrogen U-tube that has lost vacuum and has been replaced. It is or will be leak tested to determine how to make repairs. Hall C should push to be ready for the July 16 4K available but should let me know if for some reason they will not be ready.

Hall B: Is nearly done with all maintenance on its cryo-hardware and this will be completed by the end of next week. Hall B will be ready for 4K cooldown on July 16 but is prepared to wait until August 1 or later if needed. But they would like to get to 4K to check the target.

Hall A: Is working on vacuums. If they desire an earlier cooldown than what is in the attached file they should prepare to receive 4 atm helium for 300 to 80K cooling on ~August 1

Please address any questions to me.

Dave Kashy
Physics Division Cryogenic Coordinator
757-269-7275 w
757-876-3265 c 


----- Original Message -----
From: "kashy" <kashy at jlab.org>
To: "Rolf Ent" <ent at jlab.org>, "rossi patrizia" <rossi at jlab.org>, "gomez" <gomez at jlab.org>, "Jonathan Creel" <creel at jlab.org>, "Arne Freyberger" <freyberg at jlab.org>, "Volker Burkert" <burkert at jlab.org>, "Cynthia Keppel" <keppel at jlab.org>, "Stephen A. Wood" <saw at jlab.org>, "Steve Lassiter" <lassiter at jlab.org>, "Ruben Fair" <rfair at jlab.org>, "Robert Miller" <rmiller at jlab.org>, "kashy" <kashy at jlab.org>, "Will Oren" <oren at jlab.org>, "Nusair Hasan" <hasan at jlab.org>, "Steve Suhring" <suhring at jlab.org>, "jwilson" <jwilson at jlab.org>, "Christopher Perry" <cperry at jlab.org>, "Jessie Butler" <jbutler at jlab.org>, "Heidi Fansler" <fansler at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Dave Gaskell" <gaskelld at jlab.org>, "Jack Segal" <segal at jlab.org>, "brindza" <brindza at jlab.org>, "Robert Miller" <rmiller at jlab.org>
Sent: Friday, May 4, 2018 11:40:55 AM
Subject: Cryo-Coordinator Report #7 - Summer SAD2018 ESR Complex planning meeting 5_3_18 minutes

Attached are the minutes.
Please be sure to read up to and including the last bullet item on the last page.

Thanks
Dave
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