[Gradient_task_force] Cavity maintenance opportunities

[Eduard Pozdeyev]

Is there a task number? How long is it going to take?

Eduard.

--
Eduard Pozdeyev
Director of Accelerator Operations
(office) 757-269-5770
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From: Gradient_task_force <gradient_task_force-bounces at jlab.org> on behalf of Tom Powers <powers at jlab.org>
Date: Tuesday, February 27, 2024 at 1:43 PM
To: Mike McCaughan <michaelm at jlab.org>, gradient_task_force at jlab.org <gradient_task_force at jlab.org>, Harshani Senevirathne <iresha at jlab.org>
Subject: Re: [Gradient_task_force] Cavity maintenance opportunities
I looked at the 1L10 trips from the first of the year.  Cavity 2 has about 5 or 6 electronic quenches which is probably arcing on the cavity side of the cold window.  Other than that there were mostly microphonics based trips.  Probably related to tuners moving.  On a few trips were because a motor was oscillating.

None were quenches that looked like multipacting.

T
On 2/27/2024 12:59 PM, Mike McCaughan wrote:
C75 limitations attached. Cavity 1 is at 11.8 as it encountered a beam line vacuum fault and quench repeatably at 12.3 MV/m. Please keep and eye on beam line and waveguide vacuum if you attempt to process that cavity. Cavity 8 also looks like it encounters beam line vacuum faults at ~15.5 MV/m.
Mike



________________________________
From: Gradient_task_force <gradient_task_force-bounces at jlab.org><mailto:gradient_task_force-bounces at jlab.org> on behalf of Tom Powers <powers at jlab.org><mailto:powers at jlab.org>
Sent: Tuesday, February 27, 2024 12:49 PM
To: gradient_task_force at jlab.org<mailto:gradient_task_force at jlab.org> <gradient_task_force at jlab.org><mailto:gradient_task_force at jlab.org>; Harshani Senevirathne <iresha at jlab.org><mailto:iresha at jlab.org>
Subject: Re: [Gradient_task_force] Cavity maintenance opportunities

2, 5 and 8 had 100 ms Quenches back in Sept.  That is an indication of a
multipactor.   They should be pulsed processed.

I don't know why cavity 1 is turned down so low.

I will check recent data for electronic quenches in 1L05 1 and 8 and 100
ms quenches everywhere else in 1L05 later this afternoon.

If you are processing 1 or 8 and the adjacent vacuum valve closes due to
an outburst you should stop doing that cavity so that you lower the risk
of the valve shedding particles.

Tom

On 2/27/2024 12:09 PM, Harshani Senevirathne wrote:
> 1L05-1 and 8.

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