[Hallb-engineering] [New Logentry] Follow-up Re: Solenoid Cooldown

[kashy at jlab.org]

Logentry Text:
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The Solenoid is now in the second part of the phase 1 of cooling. This is the "80K soak period". We are supplying helium cooled by LN2 only, ie, no warm helium mixed with this. Control loops have been changed as follows. 
PV8563W in manual mode and closed
PV8563C in PID mode with flow setpoint of 5.5g/s and limit on PT8563 of 2.6 atm.
It is expected that Coil 5 will reach  110 K on Monday Sept 4. 
On Tuesday if all is OK we will start phase 2 cooling using 4K helium directly from ESR. Planned flow rate is 2-4g/s and time for cooling is 1 to 3 days 
Load cells on the Z (beam direction) supports started taking load on 8/25 and all had some load by by 8/31. The load cell plot which is shown which does not have the zero load offset supressed. Maximum allowed load on Z supports is 1750lbs. We will track this through the weekend and but I suspect we will not get close to the limit during the 80K soak phase of the CD.




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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3483142
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