[Dsg-hallb_magnets] Torus Fast Dump Timeline

[Brian Eng]

That particular ramp has a known cause which is why I didn't include it in the timeline; it was also only the solenoid.

There was also another controlled ramp due to cryo issues: https://logbooks.jlab.org/entry/4213546
________________________________
From: Stepan Stepanyan <stepanya at jlab.org>
Sent: Monday, February 12, 2024 6:04 PM
To: Brian Eng <beng at jlab.org>
Cc: dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Subject: Re: [Dsg-hallb_magnets] Torus Fast Dump Timeline

Brian,

Thank you for your investigation. We definitely need the meeting to get to the bottom of this. We cannot afford so many dumps. This is destructive for the experiments and very bad for magnets. By the way, we had one more controlled ramp down of the solenoid on 01/23 - https://logbooks.jlab.org/entry/4242478.

Regards, Stepan

On Feb 12, 2024, at 5:08 PM, Brian Eng via Dsg-hallb_magnets <dsg-hallb_magnets at jlab.org<mailto:dsg-hallb_magnets at jlab.org>> wrote:

We’ll need to have a meeting next week when Probir is back, but at least starting to gather information.

9/29/2023
Checkout is completed
https://logbooks.jlab.org/entry/4189383 – there is a spreadsheet that has the actual QD values, I’m just not sure where.
https://logbooks.jlab.org/entry/4189323 – instrumentation checkout PDF attached

9/30
https://logbooks.jlab.org/entry/4189846 – flakey switches in VT panel causing controlled ramp downs at low current


10/10
https://logbooks.jlab.org/entry/4196814 – first fast dump & interlocks
https://logbooks.jlab.org/entry/4196848 – cryo recovery and another comment about flakey switches

12/10
https://logbooks.jlab.org/entry/4232387 – second fast dump
https://logbooks.jlab.org/entry/4232495 – interlocks
https://logbooks.jlab.org/entry/4232499 – hardware jumpers installed to bypass switches

2/10/2024
https://logbooks.jlab.org/entry/4250279 - third fast dump & interlocks

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