[Esr-users] update: ESR status and recovery of Halls

[JLab]

Joe,

Thank you very much for the update! - this is a much better situation than my gloomy understanding.
Thank you again - Javier


> On Mar 7, 2018, at 5:17 PM, Joe D. Wilson, Jr <jwilson at jlab.org> wrote:
> 
> Hello,
> Update as of 1650 on 7Mar18: Except for Right Dipole, all Hall A magnet have
> liquid and on cold return. The overnight plan is to leave the Hall A Right
> Dipole on warm return to continue cooling while the ESR dewar refills. The
> expectation for the morning of 8Mar18 morning is reach ESR- Hall A
> conditions such that more ESR capacity can be shifted to Hall C. 
> Thanks!
> 
> -----------------
> Joe D. Wilson, Jr.
> Cryogenic Operations Engineer
> 
> Jefferson Lab
> www.jlab.org
> 757-269-7722
> jwilson at jlab.org
> 
> 
> 
> -----Original Message-----
> From: Esr-users [mailto:esr-users-bounces at jlab.org] On Behalf Of JLab
> Sent: Wednesday, March 7, 2018 4:47 PM
> To: esr-users <esr-users at jlab.org>
> Cc: Patrizia Rossi <rossi at jlab.org>; Rolf Ent <ent at jlab.org>
> Subject: Re: [Esr-users] ESR status and recovery of Halls
> 
> Hi,
> 
> Dave Kashy and I just had a chat. I understand that Halls B and C are empty
> (mostly) while Hall A is trying to fill their magnets without much success -
> I think I saw LQ3 been put on cold return recently.  If the above statement
> is correct, could this this be due to a problem (or problems) like
> insulating vacuum (I think that I saw a question from Dave to the esr-users
> list asking about this but never saw an answer) or something else?
> 
> Thanks in advance for any help you guys can give me to understand what is
> going on - Javier
> 
> 
>> On Mar 7, 2018, at 10:41 AM, Dave Kashy <kashy at jlab.org> wrote:
>> 
>> Hello All,
>> The attached file shows the current status of all of the magnets in the
> ESR complex.
>> It shows that we have not made significant progress in recovering from the
> trip two days ago.
>> 
>> It appears that shutting off Hall B completely was not enough to make the
> recovery simple.
>> Yesterday we prioritized Hall A first and Hall C second in our meeting
> after the 08:00 meeting at MCC.
>> Apparently this did not go so well.
>> 
>> Cryo started the transferline yesterday afternoon and we still have not
> made significant progress. 
>> 
>> This morning I met with the cryo group to discuss the possible causes.
>> 1) we may additional loads - So each Hall A and C as well as cryo should
> check the VJ pressure or temperatures to look for additional heat loads.
>> 2) We may have lost capacity of the ESR refrigerator so Cryo will check to
> see if flows and temperature ratios are normal
>> 3) We may have magnets on the wrong type of return 
>> 4) we may be trying to cool too much at the same time
>> 
>> 
>> We decided that we must start to make progress and we will follow the
> priority guidance that was agreed to yesterday.
>> 
>> Recover A, then recover C then recover B
>> 
>> As such:
>> 
>> 1) Hall C should prioritize their system to take only 5 g/s until all Hall
> A magnets are full and stable
>> 2) Cryo and Hall A should put all magnets on warm return and cool only a
> few at a time until those can be put on cold return while giving those on
> warm return just enough to keep them from warming significantly.
>> 3) Hall B will wait until all other magnets are on cold return. 
>> 4) After all the Halls are recovered, the 10,000 liter dewar at ESR will
> be topped off.
>> 
>> 
>> If Hall C needs more or can take less flow please let me know.
>> 
>> Thanks
>> Dave Kashy
>> <Status of Halls 3_7_2018 10
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