[Dsg-hallb_magnets] Solenoid Polarity Reversal

[Ruben Fair]

Thank you Brian. 

I shall incorporate these guidelines into the ramp up/down procedure that I am presently modifying for the solenoid. 

Cheers 

Ruben 



From: "Brian Eng" <beng at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Tuesday, September 26, 2017 4:22:31 PM 
Subject: [Dsg-hallb_magnets] Solenoid Polarity Reversal 

Ruben, 

Attached are the timestamped notes that I took when Pablo and I were testing the solenoid earlier today in the window Bob had between CND installation. 

End result: if you wait long enough (I think at least 5 minutes should be okay [~2 minutes worked once, but tripped the other time]) after the MPS has ramped to "zero" and then turn the MPS off you can switch the polarity without any fast dumps. 

Also, unexpectedly, switching the polarity when the MPS is off will clear any QD faults remotely. 

-- 
Brian Eng 
Detector Support Group 
757-269-6018 


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