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Can anyone tell me whether we can scan the beam across the vacuum window to determine whether there are any oil droplets (or polymerized residues) on the window? If we have several mm of clearance, we can make this scan and consider whether there is any kind
of suspicious structure.</div>
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Michael Tiefenback<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> mhattawy@odu.edu <mohammad.hattawy@gmail.com><br>
<b>Sent:</b> Friday, August 28, 2020 13:44<br>
<b>To:</b> Eugene Pasyuk <pasyuk@jlab.org><br>
<b>Cc:</b> Brian Freeman <bfreeman@jlab.org>; Bob Miller <rmiller@jlab.org>; David Hamlette <hamlette@jlab.org>; Dennis Turner <dturner@jlab.org>; Eric Christy <meric.christy@gmail.com>; HyeKyoung Park <hkpark@jlab.org>; Michael Tiefenback <tiefen@jlab.org>;
Paul Vasilauskis <vasilaus@jlab.org>; Sebastian Kuhn <kuhn@jlab.org>; Stepan Stepanyan <stepanya@jlab.org>; Valery Kubarovsky <vpk@jlab.org>; bteam@jlab.org <bteam@jlab.org><br>
<b>Subject:</b> Re: [BTeam] [EXTERNAL] Follow up on Hall B Halo Rates Troubleshooting</font>
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<div dir="ltr">Hello Eugene,
<div> If you are asking about the window foil before the target entrance, then we dont know. Answering this question would take 24 hours of work to get there ( disassembling beamline components, pull back the CVT cart, unplug BONuS cables to reach the region
to release the beamline pipe from that side)</div>
<div><br>
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<div>Mohammad. </div>
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<br>
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<div dir="ltr" class="x_gmail_attr">On Fri, Aug 28, 2020 at 1:31 PM Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org">pasyuk@jlab.org</a>> wrote:<br>
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<p class="x_MsoNormal">Do you see any deposits on the window foil?<u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">-Eugene<u></u><u></u></p>
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<p class="x_MsoNormal"><b>From:</b> <a href="mailto:mhattawy@odu.edu" target="_blank">
mhattawy@odu.edu</a> <<a href="mailto:mohammad.hattawy@gmail.com" target="_blank">mohammad.hattawy@gmail.com</a>>
<br>
<b>Sent:</b> Friday, August 28, 2020 13:27<br>
<b>To:</b> Brian Freeman <<a href="mailto:bfreeman@jlab.org" target="_blank">bfreeman@jlab.org</a>><br>
<b>Cc:</b> Bob Miller <<a href="mailto:rmiller@jlab.org" target="_blank">rmiller@jlab.org</a>>; David Hamlette <<a href="mailto:hamlette@jlab.org" target="_blank">hamlette@jlab.org</a>>; Dennis Turner <<a href="mailto:dturner@jlab.org" target="_blank">dturner@jlab.org</a>>;
Eric Christy <<a href="mailto:meric.christy@gmail.com" target="_blank">meric.christy@gmail.com</a>>; Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org" target="_blank">pasyuk@jlab.org</a>>; HyeKyoung Park <<a href="mailto:hkpark@jlab.org" target="_blank">hkpark@jlab.org</a>>;
Michael Tiefenback <<a href="mailto:tiefen@jlab.org" target="_blank">tiefen@jlab.org</a>>; Paul Vasilauskis <<a href="mailto:vasilaus@jlab.org" target="_blank">vasilaus@jlab.org</a>>; Sebastian Kuhn <<a href="mailto:kuhn@jlab.org" target="_blank">kuhn@jlab.org</a>>;
Stepan Stepanyan <<a href="mailto:stepanya@jlab.org" target="_blank">stepanya@jlab.org</a>>; Valery Kubarovsky <<a href="mailto:vpk@jlab.org" target="_blank">vpk@jlab.org</a>>;
<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a><br>
<b>Subject:</b> Re: [BTeam] [EXTERNAL] Follow up on Hall B Halo Rates Troubleshooting<u></u><u></u></p>
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<p class="x_MsoNormal">Hello Brian and all, <u></u><u></u></p>
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<p class="x_MsoNormal"> We did take out that portion of the beam pipe. It is not as clean as needed. Check the first picture. The second picture shows inside the beam pipe on the other side ( right side of 2H01) which is quite clean. Bob Miller will go ahead
and clean it up and ensemble the beamline again. We were expecting to see larger oil drops or something bigger than the dust we see there. Will see if this will improve the situation, if not we will continue the additional tests you have in mind. <u></u><u></u></p>
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<p class="x_MsoNormal">Mohammad Hattawy.<u></u><u></u></p>
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<p class="x_MsoNormal"><img id="x_gmail-m_4698469910479028257Picture_x0020_1" style="width:6.6666in; height:5in" width="640" height="480" data-outlook-trace="F:1|T:1" src="cid:1743628abd74ce8e91"><u></u><u></u></p>
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<p class="x_MsoNormal"><img id="x_gmail-m_4698469910479028257Picture_x0020_2" style="width:6.6666in; height:5in" width="640" height="480" data-outlook-trace="F:1|T:1" src="cid:1743628abd75b006a2"><u></u><u></u></p>
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<p class="x_MsoNormal">On Fri, Aug 28, 2020 at 12:58 Brian Freeman <<a href="mailto:bfreeman@jlab.org" target="_blank">bfreeman@jlab.org</a>> wrote:<u></u><u></u></p>
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Bob, Stepan, Mohammad, <u></u><u></u></span></p>
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I would like to thank you folks for the extensive check of the beam line. Please know that we are still internally listing other possibilities, and have several other checks to be made if nothing is found. <u></u><u></u></span></p>
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Again thanks for taking this opportunity to check things out. It will greatly help our efforts. <u></u><u></u></span></p>
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-Brian<u></u><u></u></span></p>
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<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black">
<a href="mailto:mhattawy@odu.edu" target="_blank">mhattawy@odu.edu</a> <<a href="mailto:mohammad.hattawy@gmail.com" target="_blank">mohammad.hattawy@gmail.com</a>><br>
<br>
<br>
<b>Sent:</b> Friday, August 28, 2020 11:47 AM<br>
<br>
<br>
<b>To:</b> Brian Freeman <<a href="mailto:bfreeman@jlab.org" target="_blank">bfreeman@jlab.org</a>><br>
<br>
<br>
<b>Cc:</b> Sebastian Kuhn <<a href="mailto:kuhn@jlab.org" target="_blank">kuhn@jlab.org</a>>; Bob Miller <<a href="mailto:rmiller@jlab.org" target="_blank">rmiller@jlab.org</a>>; David Hamlette <<a href="mailto:hamlette@jlab.org" target="_blank">hamlette@jlab.org</a>>;
Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org" target="_blank">pasyuk@jlab.org</a>>; Michael Tiefenback <<a href="mailto:tiefen@jlab.org" target="_blank">tiefen@jlab.org</a>>; Dennis Turner <<a href="mailto:dturner@jlab.org" target="_blank">dturner@jlab.org</a>>;
HyeKyoung Park <<a href="mailto:hkpark@jlab.org" target="_blank">hkpark@jlab.org</a>>;
<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a><br>
<br>
<<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a>>; Stepan Stepanyan <<a href="mailto:stepanya@jlab.org" target="_blank">stepanya@jlab.org</a>>; Paul Vasilauskis <<a href="mailto:vasilaus@jlab.org" target="_blank">vasilaus@jlab.org</a>>; Valery
Kubarovsky <<a href="mailto:vpk@jlab.org" target="_blank">vpk@jlab.org</a>></span><u></u><u></u></p>
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<br>
<b>Subject:</b> Re: [BTeam] [EXTERNAL] Follow up on Hall B Halo Rates Troubleshooting</span><u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt">Hello all, <u></u><u></u></p>
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<p class="x_MsoNormal"> After talking with Bob Miller and Stepan Stepanyan, we ended up with only one suspicion, that is some oil from the vacuum pump went inside the beam pipe. I spoke with Brian Freeman, crew chief, and informed me that the best estimate
for the beam to<br>
<br>
be back is around 4 pm, the worst is tomorrow morning as they are still working on the south linac. <u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt"><u></u> <u></u></p>
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<p class="x_MsoNormal"> Given the time estimate from Bob Miller for taking out the beam pipe, cleaning it, and putting it back would take about three hours. We will go ahead and clean the beam pipe between the end of the CVT carte and 2H01A.<u></u><u></u></p>
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<p class="x_MsoNormal">Mohammad Hattawy. <u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt">On Fri, Aug 28, 2020 at 10:43 AM Brian Freeman <<a href="mailto:bfreeman@jlab.org" target="_blank">bfreeman@jlab.org</a>> wrote:<br>
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<u></u><u></u></p>
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Thank you for all the reply and the good information, these things will help. <u></u><u></u></span></p>
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-Brian<u></u><u></u></span></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt"><b><span style="color:black">From:</span></b><span style="color:black"><br>
<br>
<a href="mailto:mhattawy@odu.edu" target="_blank">mhattawy@odu.edu</a> <<a href="mailto:mohammad.hattawy@gmail.com" target="_blank">mohammad.hattawy@gmail.com</a>><br>
<br>
<br>
<b>Sent:</b> Friday, August 28, 2020 9:57 AM<br>
<br>
<br>
<b>To:</b> Sebastian Kuhn <<a href="mailto:kuhn@jlab.org" target="_blank">kuhn@jlab.org</a>>; Bob Miller <<a href="mailto:rmiller@jlab.org" target="_blank">rmiller@jlab.org</a>>; David Hamlette <<a href="mailto:hamlette@jlab.org" target="_blank">hamlette@jlab.org</a>>;<br>
<br>
Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org" target="_blank">pasyuk@jlab.org</a>><br>
<br>
<br>
<b>Cc:</b> Brian Freeman <<a href="mailto:bfreeman@jlab.org" target="_blank">bfreeman@jlab.org</a>>; Michael Tiefenback <<a href="mailto:tiefen@jlab.org" target="_blank">tiefen@jlab.org</a>>; Dennis Turner <<a href="mailto:dturner@jlab.org" target="_blank">dturner@jlab.org</a>>;<br>
<br>
HyeKyoung Park <<a href="mailto:hkpark@jlab.org" target="_blank">hkpark@jlab.org</a>>;<br>
<br>
<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a> <<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a>>; Stepan Stepanyan <<a href="mailto:stepanya@jlab.org" target="_blank">stepanya@jlab.org</a>>; Paul Vasilauskis <<a href="mailto:vasilaus@jlab.org" target="_blank">vasilaus@jlab.org</a>><br>
<br>
<br>
<b>Subject:</b> Re: [BTeam] [EXTERNAL] Follow up on Hall B Halo Rates Troubleshooting</span><u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt">Hello all, <br>
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<p class="x_MsoNormal" style="margin-bottom:12pt"> David Hamlette surveyed the upstream beam pipe, around 9 AM, and did not find any hot spot. The beam has gone at 5:00 AM, so maybe the 4 hours down time did kill all the activation. Bob Miller is in the Hall
to cycle the other valve, VBF2H01A, and check<br>
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the beamline components once more for any displacement. <br>
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<u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt">Mohammad. <br>
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<p class="x_MsoNormal" style="margin-bottom:12pt">On Fri, Aug 28, 2020 at 9:28 AM Sebastian Kuhn <<a href="mailto:kuhn@jlab.org" target="_blank">kuhn@jlab.org</a>> wrote:<br>
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<u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt">Just a small addition: We have already tried re-centering the beam on the target structure - TWICE - and also changing the angle with which it comes into the Hall. Nothing changed the background, and we could
not find any obstructions other than the known<br>
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target walls, which we avoid by centering the beam.<u></u><u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt">- Sebastian<br>
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<p class="x_MsoNormal">On Aug 28, 2020, at 6:01 AM, Brian Freeman <<a href="mailto:bfreeman@jlab.org" target="_blank">bfreeman@jlab.org</a>> wrote:<u></u><u></u></p>
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<li class="x_MsoNormal" style="background:white"><span style="font-size:12pt; color:black">We could simply try angle and position changes into the target ? It looks like things got really noisy after a target change in the hall on the 15th, probably a coincidence
(<a href="https://logbooks.jlab.org/entry/3835820" target="_blank">https://logbooks.jlab.org/entry/3835820</a>)<br>
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. I believe that the Midstream counters sit around the Target somewhere, and Downstream counters are after CLAS. So perhaps we just have a bad angle going into the Target? ( 1hr )</span><span style="font-size:12pt"><u></u><u></u></span></li></ol>
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<p class="x_MsoNormal" style="margin-bottom:12pt">Best regards,<br>
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Mohammad Hattawy.<br>
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Mohammad Hattawy.<br>
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Mohammad Hattawy.<br>
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