[Hallb-engineering] [New Logentry] Solenoid "Training Quench" and Recovery

Hugh Montgomery mont at jlab.org
Fri Sep 15 12:51:32 EDT 2017


Sent from my iPhone

> On Sep 15, 2017, at 12:48, Glenn Young <gyoung at jlab.org> wrote:
> Dear Mont,
> It is in the fast daq files that Brian Eng recovers and circulates.
> The first morning quench was at 1059 amps and the second at 1066 amps.  Coil 3 both times.
> We have thus had, in order, quenches in coil 3,4,4,3,3.
> Should try again about 2PM today once cryo has finished recovering.
> Regards, Glenn
>> On 9/15/2017 11:38 AM, Hugh Montgomery wrote:
>> Dave,
>> Where do I read the current at which the dump occurred?
>> Mont
>> From: kashy at jlab.org [mailto:kashy at jlab.org] 
>> Sent: Friday, September 15, 2017 11:25 AM
>> To: hallb-engineering at jlab.org; stuart at jlab.org; mont at jlab.org; ent at jlab.org; rossi at jlab.org; gomez at jlab.org; rfair at jlab.org; hogan at jlab.org; gyoung at jlab.org
>> Subject: [New Logentry] Solenoid "Training Quench" and Recovery
>> Solenoid "Training Quench" and Recovery
>> Lognumber 3484541. Submitted by kashy on Fri, 09/15/2017 - 11:23.
>> Logbooks:
>> We started ramping at 08:30 and at 9:08 the magnet fast dumped. Cryogenic recovery took about 1hr and 50 minutes so total was 2.5 hrs start ramp to ready again
>> We are ramping again.
>> We implemented a manual version of a pressure venting system that is designed to keep from blowing relief valve RV8670 which does not reseat w/o shutting off the helium. This should keep the time to recover lower and allow no intervention recovery as we just did.
>> This also reduces peak load and pressure on warm return and thus have less impact on other magnet lead flows.
>> At 11:05 we started ramp #2 for today
>> <image001.gif>
>> <image003.gif>
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