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<p style="margin-top:0;margin-bottom:0"> Hi Matt,</p>
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<p style="margin-top:0;margin-bottom:0">according to the pictures the square pipe is asymmetrical vs beam line</p>
<p style="margin-top:0;margin-bottom:0">and is <span style="font-size: 12pt;">most likely causing the "shade" on ComCal face.</span></p>
<p style="margin-top:0;margin-bottom:0">Wondering if FCAL is placed symmetrically vs beam,</p>
<p style="margin-top:0;margin-bottom:0">that should mean that pipe doesn't exactly match FCAL hole.</p>
<p style="margin-top:0;margin-bottom:0">The exact values from drawings would help and needed for MC</p>
<p style="margin-top:0;margin-bottom:0">geometry db to get an exact acceptance.</p>
<p style="margin-top:0;margin-bottom:0">If it is the case, that only mean we have to reduce ComCal</p>
<p style="margin-top:0;margin-bottom:0">fiducial region for Compton events.</p>
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<p style="margin-top:0;margin-bottom:0"> Thanks for pictures.</p>
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<p style="margin-top:0;margin-bottom:0">Ilya</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>От:</b> GlueX-Collaboration <gluex-collaboration-bounces@jlab.org> от имени Shepherd, Matthew <mashephe@indiana.edu><br>
<b>Отправлено:</b> 28 февраля 2019 г. 12:49<br>
<b>Кому:</b> Ashot Gasparian<br>
<b>Копия:</b> primexd@jlab.org; andrsmit@jlab.org; GlueX Collaboration; Mark Stevens<br>
<b>Тема:</b> Re: [GlueX] Target installation plan</font>
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Hi Ashot,<br>
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> On Feb 28, 2019, at 11:58 AM, gasparan@jlab.org wrote:<br>
<br>
> Therefore, it would be extremely important to take pictures of the FCAL<br>
> insertion part and post on some place to see, before our meeting this<br>
> evening.<br>
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<br>
I've posted pictures of the FCAL insert here:<br>
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<a href="https://logbooks.jlab.org/entry/3661206" id="LPlnk253795" class="OWAAutoLink" previewremoved="true">https://logbooks.jlab.org/entry/3661206</a><br>
<br>
It looked today exactly as it did 5+ years ago when these were taken. (I'm surprised you haven't taken a peek at it before as it defines the acceptance of your detector.)<br>
<br>
The Plexiglas monitoring system is held in the groove on the upstream end. Anything of any density should be clear of the inner opening in the tube. From the darkroom all that is visible is what appears to be a thin tedlar cover on the upstream end. It is
needed for a light seal or else there is light path from the hall into the darkroom via the beam pipe.<br>
<br>
Matt<br>
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Matthew Shepherd, Professor<br>
Department of Physics, Indiana University, Swain West 265<br>
727 East Third Street, Bloomington, IN 47405<br>
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Office Phone: +1 812 856 5808</div>
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