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<p class="MsoNormal"><span style="font-size:11.0pt">Is there a task number? How long is it going to take?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Eduard.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Eduard Pozdeyev<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">(office) 757-269-5770<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Gradient_task_force <gradient_task_force-bounces@jlab.org> on behalf of Tom Powers <powers@jlab.org><br>
<b>Date: </b>Tuesday, February 27, 2024 at 1:43</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Mike McCaughan <michaelm@jlab.org>, gradient_task_force@jlab.org <gradient_task_force@jlab.org>, Harshani Senevirathne <iresha@jlab.org><br>
<b>Subject: </b>Re: [Gradient_task_force] Cavity maintenance opportunities<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">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<o:p></o:p></p>
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<p class="MsoNormal">On 2/27/2024 12:59 PM, Mike McCaughan wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Mike<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Gradient_task_force
<a href="mailto:gradient_task_force-bounces@jlab.org"><gradient_task_force-bounces@jlab.org></a> on behalf of Tom Powers
<a 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 href="mailto:gradient_task_force@jlab.org">gradient_task_force@jlab.org</a>
<a href="mailto:gradient_task_force@jlab.org"><gradient_task_force@jlab.org></a>; Harshani Senevirathne
<a href="mailto:iresha@jlab.org"><iresha@jlab.org></a><br>
<b>Subject:</b> Re: [Gradient_task_force] Cavity maintenance opportunities</span>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">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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