<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body text="#000000" bgcolor="#ffffff">
<pre wrap="">Please RSVP to: <a class="moz-txt-link-abbreviated" href="mailto:harris@jlab.org">harris@jlab.org</a> by Wednesday, November 17th.
<span class="moz-txt-citetags"></span>
<span class="moz-txt-citetags"></span>Feasibility and Conceptual Design of a C.W. Positron Source at CEBAF
<span class="moz-txt-citetags"></span>
<span class="moz-txt-citetags"></span><b class="moz-txt-star"><span class="moz-txt-tag">*</span>Serkan Golge<span class="moz-txt-tag">*</span></b>
<span class="moz-txt-citetags"></span>North Carolina Central University
<span class="moz-txt-citetags"></span>
<span class="moz-txt-citetags"></span><b><font color="#000000">*Due to a conflict, the Seminar has been moved to:
<span class="moz-txt-citetags"></span>Thursday, November 18, 2010
<span class="moz-txt-citetags"></span>12:00-1:30pm
<span class="moz-txt-citetags"></span>CC F113</font>
<span class="moz-txt-citetags"></span></b>
<span class="moz-txt-citetags"></span>Abstract
<span class="moz-txt-citetags"></span>
<span class="moz-txt-citetags"></span>A feasibility study of a CW positron source for the 12 GeV upgrade at
<span class="moz-txt-citetags"></span>Jefferson Lab (JLAB) is provided. The proposed >=100 nA Continuous
<span class="moz-txt-citetags"></span>Wave (CW) positron source at JLAB has several unique and challenging
<span class="moz-txt-citetags"></span>characteristics: high current incident electron beam at 126 MeV with a
<span class="moz-txt-citetags"></span>high beam power (up to a MW); CW electron beam and CW positron production.
<span class="moz-txt-citetags"></span>The optimization of the target thickness and beam energy are completed.
<span class="moz-txt-citetags"></span>Three positron injector configurations are proposed; Combined Function
<span class="moz-txt-citetags"></span>Magnet, Two-Dipole and Microtron Dipole configurations. By using 126 MeV
<span class="moz-txt-citetags"></span>10 mA e- beam impinging on a 2 mm W target with a 100 micron spot size,
<span class="moz-txt-citetags"></span>we can get up to 3 uA useful e+ current at the North Linac connection. One
<span class="moz-txt-citetags"></span>of the biggest challenges is the target design, which the deposited power
<span class="moz-txt-citetags"></span>is about 60 kW. Possible solutions are presented to address the target
<span class="moz-txt-citetags"></span>issue as well.
<span class="moz-txt-citetags"></span>
</pre>
</body>
</html>