[Esr-users] Hall C Testing

[Probir Ghoshal]

Dear all 
We are planning to charge both magnets in hall B to full field tomorrow at 800 hrs.
Chris (CHL) or anybody else have any concerns that hall b needs to be aware off, please let us know if there is any hold ups or issues. We intend to try out the safety relief on solenoid at ~500 A by carrying out a fast discharge..!
Thanks to all...!

Regards, 
Probir 

> On Aug 7, 2018, at 9:49 AM, Dave Kashy <kashy at jlab.org> wrote:
> 
> Hi Jessie,
> At the beginning of the downtime, priorities were set such that both Halls B and C must be ready for Physics on August 22. If Hall A is ready that would be great, but the priority and requirement was for B, C and D to be ready on that date. 
> 
> To be ready the systems must be checked before August 17 and the earlier the better. If Halls B and C are checked while Hall A is still on the 80K portion of its cooldown, then any issues will have less of an effect versus if they happen while Hall A is in its 4K cooldown. 
> 
> 
> To be sure that they are ready, both Hall B and C must power their magnets ASAP. There have been some issues at CHL so recovery compressor capacity is limited and will effect all of us. 
> 
> Hall B is planning to ramp on Wednesday. If any magnet dumps then what ever delays must be absorbed by everyone.  There is lots of survey work in Hall B today, Thursday and Friday that will have to be rescheduled if Hall B ramping is delayed so keeping to this date is important. Testing includes ramping both magnets to full field and a low current Fast Dump of the Solenoid from ~500 amps to test the new relief valve heater system. This Fast Dump of the Solenoid will put a bump on the recovery system which should be short lived.
> 
> I have checked with Javier to see if priorities have changed and he has spoken to Rolf. The priorities have not changed. If you have questions please let me know.
> Thanks
> Dave
> 
> ----- Original Message -----
> From: "Jessie Butler" <jbutler at jlab.org>
> To: "Steve Lassiter" <lassiter at jlab.org>
> Cc: "Cynthia Keppel" <keppel at jlab.org>, "Stephen A. Wood" <saw at jlab.org>, "kashy" <kashy at jlab.org>, "esr-users" <esr-users at jlab.org>
> Sent: Tuesday, August 7, 2018 7:43:10 AM
> Subject: Hall C Testing
> 
> Hi Steve,
> 
> We are currently in the process of cooling down our magnets in Hall A so we are flowing back on warm return. Dumps in Hall C (or Hall B) will affect our progress and likely create issues within our cryogenic and vacuum systems. Is it possible for you to postpone these tests until Hall A is cold and on cold return? At the current rate, Hall A should be on cold return and stable NLT Aug 17th. 
> 
> Thanks,
> 
> Jessie Butler 
> Jefferson Lab 
> Physics/Hall-A Work Coordinator 
> 757-269-5544 
> 
> EXCELLENCE IS OUR STANDARD; 
> PERFECTION IS OUR GOAL.
> _______________________________________________
> Esr-users mailing list
> Esr-users at jlab.org
> https://mailman.jlab.org/mailman/listinfo/esr-users