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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. <br>
<br>
None were quenches that looked like multipacting.<br>
<br>
T<br>
<br>
<div class="moz-cite-prefix">On 2/27/2024 12:59 PM, Mike McCaughan
wrote:<br>
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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.</div>
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Mike<br>
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<div dir="ltr" id="divRplyFwdMsg"><span style="font-family:
Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Gradient_task_force
<a class="moz-txt-link-rfc2396E" href="mailto:gradient_task_force-bounces@jlab.org"><gradient_task_force-bounces@jlab.org></a> on behalf of Tom
Powers <a class="moz-txt-link-rfc2396E" href="mailto:powers@jlab.org"><powers@jlab.org></a><br>
<b>Sent:</b> Tuesday, February 27, 2024 12:49 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:gradient_task_force@jlab.org">gradient_task_force@jlab.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:gradient_task_force@jlab.org"><gradient_task_force@jlab.org></a>; Harshani Senevirathne
<a class="moz-txt-link-rfc2396E" href="mailto:iresha@jlab.org"><iresha@jlab.org></a><br>
<b>Subject:</b> Re: [Gradient_task_force] Cavity maintenance
opportunities</span>
<div> </div>
</div>
<div><span style="font-size: 11pt;">2, 5 and 8 had 100 ms Quenches
back in Sept. That is an indication of a<br>
multipactor. They should be pulsed processed.<br>
<br>
I don't know why cavity 1 is turned down so low.<br>
<br>
I will check recent data for electronic quenches in 1L05 1 and
8 and 100<br>
ms quenches everywhere else in 1L05 later this afternoon.<br>
<br>
If you are processing 1 or 8 and the adjacent vacuum valve
closes due to<br>
an outburst you should stop doing that cavity so that you
lower the risk<br>
of the valve shedding particles.<br>
<br>
Tom<br>
<br>
On 2/27/2024 12:09 PM, Harshani Senevirathne wrote:<br>
> 1L05-1 and 8.<br>
<br>
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