[Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done

[Rolf Ent]

Dear all, 

I agree with Volker, this was great to see. Cooling to below 5K went smoothly this week. Now on to 
the safe 100 A testing!!! I hope to see a nice mail appear tomorrow on the success. 

Congratulations, we are nearly there! 

Best regards, Rolf 


From: "burkert" <burkert at jlab.org> 
To: kashy at jlab.org 
Cc: "Ruben Fair" <rfair at jlab.org>, ghoshal at jlab.org, "Glenn Young" <gyoung at jlab.org>, josephm at jlab.org, "Patrizia Rossi" <rossi at jlab.org>, "Rolf Ent" <ent at jlab.org>, hogan at jlab.org, "Hugh Montgomery" <mont at jlab.org>, "lung" <lung at jlab.org>, stuart at jlab.org, lassiter at jlab.org, fansler at jlab.org, "Javier Gomez" <gomez at jlab.org>, hallb-engineering at jlab.org, "clas members" <clas_members at jlab.org> 
Sent: Thursday, September 7, 2017 4:03:55 PM 
Subject: Re: [Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done 

Dear all, 

Congratulations to this great success. All coils below 5K is a fantastic achievement and in record time! 
Now on to power up! 

Volker Burkert 

----- Original Message ----- 
From: kashy at jlab.org 
To: rfair at jlab.org, ghoshal at jlab.org, gyoung at jlab.org, josephm at jlab.org, rossi at jlab.org, ent at jlab.org, hogan at jlab.org, mont at jlab.org, lung at jlab.org, stuart at jlab.org, lassiter at jlab.org, fansler at jlab.org, gomez at jlab.org, hallb-engineering at jlab.org 
Sent: Thursday, September 7, 2017 3:00:03 PM 
Subject: [Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done 

Solenoid Cooldown - Cooling Basically Done 


Lognumber 3483774 . Submitted by kashy on Thu, 09/07/2017 - 14:55. Logbooks: HBSOLENOID CLOG 
References: 3483741 - Follow-up Re: Solenoid Cooldown 


Congratulations to ALL, A major step has been completed today. 
The Solenoid is cold and we have Liquid Helium in both the lead reservoir and Magnet reservoir! 
I will continue to tune the control loops to improve stability. 
Lead flow controllers were replaced this morning and are working perfectly. 

One major sticking point to powering the magnet is completion of the Hi-Pot test. 
At present we have a team looking at a low resistance to ground of the water cooled lead "A". 

The superconducting liquid probes have been disconnected and are being investigated. 
Helium flow from ESR has reduced from ~10g/s to ~6g/s 

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