[Esr-users] Halls This weekend and next week

[Dave Kashy]

Hi Jessie,
I would like to know more about the issues you bring up, heat load and leaks. Early next week I'll be available to go over the Hall A system to understand more if you or someone has time to run down the known issues. 

As far as magnets in one Hall quenching and taking out other Halls there may be some things that we can do. In Hall B we disconnected all Relief Valve discharges from the Quench header. This decouples the effect of a quench/fast dump from effecting the warm return pressures of other halls. We also installed check valves in the U-tubes, this decoupled the supply especially for the Torus when it quenches/fast dumps from effecting the supply to the Solenoid or the other Halls. As far as warm return that becomes more complex. If we have "fast" return valves (pneumatic) we could force them shut upon fast dump and likely close them faster than the pressure build in the circuits thus further decoupling. I know this is possible for Hall B, but I don't know if it is possible for Halls A and C w/o changing the actuators from EV's to PV's as well as the controls, and these changes do have significant costs...

Matt,
I will stop by the lab tomorrow morning and have a look at that valve line up and then discuss it with the guys at cryo. It does sound odd that both warm return valves from one hall are open cross connecting ESR and Purifier suctions.


All,
In this new position, I'm not intending to become the "Lead Operator" for all three halls. Thus I will not be deciding if each hall should be on ESR or Purifier Suction. Those decisions should be based on what each Hall is doing at the time, warming up, cooling down, purifying, its contamination level, the type target it is running.... If there are questions as to what is best I'm glad to offer advice.

Thanks
Dave


----- Original Message -----
From: "Jessie Butler" <jbutler at jlab.org>
To: "Matthew Lumanog" <lumanog at jlab.org>
Cc: "kashy" <kashy at jlab.org>, "esr-users" <esr-users at jlab.org>, "rossi patrizia" <rossi at jlab.org>, "Volker Burkert" <burkert at jlab.org>, "Cynthia Keppel" <keppel at jlab.org>, "Rolf Ent" <ent at jlab.org>, "Stephen A. Wood" <saw at jlab.org>
Sent: Friday, October 13, 2017 8:13:46 PM
Subject: Re: [Esr-users] Halls This weekend and next week

Hi Dave,

Matt has brought up a good point... We have to be very mindful on how our returns are setup during a magnet quench in one of the other halls. Depending on the setup, we could experience higher than normal pressures in Hall A and in return it created problems (leaks and heat loads) within our system. In the past, these types of pressure fluctuations have taken weeks to fully recover. This is especially a greater concern to us now as we near the start of the run and each of our recovery effort has been increasingly harder. 

Thanks,

Jessie Butler 
Jefferson Lab 
Physics/Hall-A Work Coordinator 
757-269-5544 

EXCELLENCE IS OUR STANDARD; 
PERFECTION IS OUR GOAL.

----- Original Message -----
From: "Matthew Lumanog" <lumanog at jlab.org>
To: "Dave Kashy" <kashy at jlab.org>
Cc: "esr-users" <esr-users at jlab.org>, "Patrizia Rossi" <rossi at jlab.org>, "Volker Burkert" <burkert at jlab.org>, "Cynthia Keppel" <keppel at jlab.org>, "Rolf Ent" <ent at jlab.org>, "Stephen Wood" <saw at jlab.org>
Sent: Friday, October 13, 2017 4:00:09 PM
Subject: Re: [Esr-users] Halls This weekend and next week

Dave,
Halls A and B Return is presently configured to CHL Recovery.
Hall C Return appears to be currently configured to both CHL and ESR based on the valves location by ESR.
I have never seen this configuration in the past and I am not sure if this is normal for testing.
Matt

----- Original Message -----
From: "Dave Kashy" <kashy at jlab.org>
To: "esr-users" <esr-users at jlab.org>
Cc: "Stephen A. Wood" <saw at jlab.org>, "rossi patrizia" <rossi at jlab.org>, "Volker Burkert" <burkert at jlab.org>, "Cynthia Keppel" <keppel at jlab.org>, "Rolf Ent" <ent at jlab.org>
Sent: Friday, October 13, 2017 2:48:03 PM
Subject: [Esr-users] Halls This weekend and next week

Hi All,
Hall C would like to run the HMS dipole for magnet testing/measuring at near full field. The would like to run the HB to full field and this is expected to require "re-training" it, ie multiple quenches. If possible Hall C would like to cooldown their HMS dipole. The first stage is a cooldown to 80K using 4 atm helium and LN2. They can use up to 10g/s if that much is available and it should take ~3 days to get to 80K. If less is available then cooldown time will increase.

If needed this weekend or next week Hall C can warm up both Quads on the SHMS, this should save between 100 and 150 watts of refrigeration power (magnets and U-tubes) plus the lead flow. If for some reason the load needs to be shed this weekend due to ESR issues w/o the ESTL (End Station Transfer Line, this is the actual name of the TL that sends LN2 and Super Critical helium from CHL to ESR). Please call Steve Lassiter, or Mike Folwer or Paul Brindza (in that order) to have them shut off the flow to the SHMS quads.

Next week Hall B wants to run their cryotarget with H2 gas/liquid, pending approval to do so.

Hall A has no special plans at this point.

Please forward other requests and info to me.
Thanks
Dave
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