[Dsg-hallb_magnets] Solenoid ramping today - need Brian

[Amrit Yegneswaran]

glenn, 

patrizia (my CO) advised me to provide the assistance. 
so, in addition to brian, pablo will be there as well. 

amrit 




From: "Glenn Young" <gyoung at jlab.org> 
To: "Amrit Yegneswaran" <yeg at jlab.org>, "Rolf Ent" <ent at jlab.org>, "Patrizia Rossi" <rossi at jlab.org>, "Allison Lung" <lung at jlab.org> 
Cc: "Glenn Young" <gyoung at jlab.org>, "Brian Eng" <beng at jlab.org>, "Ruben Fair" <rfair at jlab.org>, "John Hogan" <hogan at jlab.org> 
Sent: Wednesday, September 13, 2017 8:26:36 AM 
Subject: Solenoid ramping today - need Brian 

Dear Amrit, 
We are going to make our second series of attempts to ramp the solenoid today. As you know well, Brian Eng is a key person on the power side of the solenoid. We've had excellent support from him. 

We managed to get to just over 1000A yesterday (40% of top field!) before encountering some trips due apparently to noise on a non-superconducting splice. 
These necessarily trigger fast dumps. Thus we need to make adjustments to remove these sources of inadvertent trips. 
We need to retune the quench detection circuits, including voltage thresholds and time delays, before we can re-start this morning. This includes analysis of the fast (10kHz data). We spent much of last evening looking at plots Brian prepared. 

Brian is central to doing all of this, and thus we'd need to keep him here in Hall B today so we can proceed and finish up on the solenoid. 

Thanks, Glenn 
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