[Dsg-hallb_magnets] [Hallb] Fwd: [Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done

[Amrit Yegneswaran]

fantastic. 
congratulations to every one. 


From: "Stepan Stepanyan" <stepanya at jlab.org> 
To: hallb at jlab.org 
Sent: Thursday, September 7, 2017 3:02:31 PM 
Subject: [Hallb] Fwd: [Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done 

We have superconducting solenoid! 

Congratulations to our magnet team, great job! 


-------- Forwarded Message -------- Subject: 	[Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done 
Date: 	Thu, 7 Sep 2017 15:00:03 -0400 (EDT) 
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 


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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