[Dsg-hallb_magnets] Solenoid ramping today - need Brian

[Glenn Young]

Dear Amrit,

As always, many thanks.
Glenn


On 9/13/2017 11:02 AM, Amrit Yegneswaran wrote:
> 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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