<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(11,83,148)">Hi folks,<br><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(11,83,148)">See message by Jay benesch and questions about ALERT. We will need to send a response. I will be on vacation next week but let's have ALERT meeting same time Thursday to discuss the plan forward.<br><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(11,83,148)">Best,<br><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(11,83,148)">Kawtar<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:#0b5394"><br></div><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Jay Benesch</b> <span dir="ltr"><<a href="mailto:benesch@jlab.org">benesch@jlab.org</a>></span><br>Date: Fri, Jun 24, 2016 at 6:21 AM<br>Subject: ALERT<br>To: Kawtar Hafidi <<a href="mailto:kawtar@anl.gov">kawtar@anl.gov</a>><br><br><br>Dr. Hafidi,<br>
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I am on JLab's Technical Advisory Committee so I have the ALERT run group proposals. I have no technical comments but you'll see my name on a TAC report. I am also on a "gradient maintenance team". Two decades ago Stan Majewski and the detector group recommended scintillating fiber and PMTs to monitor field emission. Accelerator Division has never been willing to prototype. The two layers of scintillators in ALERT caught my eye.<br>
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a. what is the radiation hardness of the scintillator? One year at the end of a C100 -> 1 MGy. Below C100 ~ 0.1 MGy.<br>
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b. rad hardness of SiPM?<br>
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c. rough cost of the 30 cm bars + SiPM? Rough cost of 3 cm outer layer units?<br>
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The 3 cm units could work well at the ends of the cryomodules where there is a copper "radiator" in the end can. The 30cm units could be placed on the floor under each cavity. Lots of assumptions here on my part, but then we have gammas up to 100 MeV so the energy range isn't too far off.<br>
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I would appreciate it if you'd pass this along to whomever might be able to answer these questions. If you feel the questions are out of line, I'd appreciate your telling me that. Thank you.<span class="HOEnZb"><font color="#888888"><br>
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Jay Benesch<br>
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