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

[Stepan Stepanyan]

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
  <https://logbooks.jlab.org/entry/3483774>

Lognumber 3483774 <https://logbooks.jlab.org/entry/3483774>. Submitted 
by kashy <https://logbooks.jlab.org/user/kashy> on Thu, 09/07/2017 - 14:55.

Logbooks: 	HBSOLENOID <https://logbooks.jlab.org/book/hbsolenoid> CLOG 
<https://logbooks.jlab.org/book/clog>
References: 	3483741 - Follow-up Re: Solenoid Cooldown 
<https://logbooks.jlab.org/entry/3483741>

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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