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So it looks like this was it..... just a bad angle going into the target.</div>
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It was reported however, that the 2C21 H corrector is railed? </div>
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We can help this out by using an upstream corrector. I can look at this today.</div>
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-Brian</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Sebastian Kuhn <kuhn@jlab.org><br>
<b>Sent:</b> Friday, August 28, 2020 9:28 AM<br>
<b>To:</b> Brian Freeman <bfreeman@jlab.org><br>
<b>Cc:</b> Michael Tiefenback <tiefen@jlab.org>; Dennis Turner <dturner@jlab.org>; HyeKyoung Park <hkpark@jlab.org>; bteam@jlab.org <bteam@jlab.org>; Stepan Stepanyan <stepanya@jlab.org>; Paul Vasilauskis <vasilaus@jlab.org>; Mohammad Hattawy <mohammad.hattawy@gmail.com><br>
<b>Subject:</b> Re: [BTeam] [EXTERNAL] Follow up on Hall B Halo Rates Troubleshooting</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">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 target walls, which we avoid by centering the beam.
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<div class="">On Aug 28, 2020, at 6:01 AM, Brian Freeman <<a href="mailto:bfreeman@jlab.org" class="">bfreeman@jlab.org</a>> wrote:</div>
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<li class="">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" id="LPlnk901337" class="">https://logbooks.jlab.org/entry/3835820</a>)
. 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 )</li></ol>
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