Etude de la faisabilité d'une source de positrons polarisée basée sur ...
Etude de la faisabilité d'une source de positrons polarisée basée sur ...
Etude de la faisabilité d'une source de positrons polarisée basée sur ...
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tel-00647307, version 1 - 1 Dec 2011<br />
Letter of Intent to PAC35<br />
Po<strong>la</strong>rized electrons for po<strong>la</strong>rized<br />
<strong>positrons</strong>:<br />
A proof–of–principle experiment<br />
Alexandre Camsonne 1 , Jonathan Dumas 1,2 , Arne Freyberger 1 ,<br />
Joseph Grames 1,† , Matt Poelker 1 , Jean-Sébastien Réal 2 ,<br />
Eric Voutier 2,†<br />
Abstract<br />
1 Thomas Jefferson National Accelerator Facility,<br />
12000 Jefferson Avenue<br />
Newport News, Virginia 23606, USA<br />
2 Laboratoire <strong>de</strong> Physique Subatomique et <strong>de</strong> Cosmologie<br />
IN2P3/CNRS, Université Joseph Fourier, INP<br />
53 rue <strong>de</strong>s Martyrs<br />
38026 Grenoble ce<strong>de</strong>x, France<br />
This letter proposes an experiment at the CEBAF injector to <strong>de</strong>monstrate and<br />
mea<strong>sur</strong>e the longitudinal po<strong>la</strong>rization transfer from a highly spin po<strong>la</strong>rized electron<br />
beam to <strong>positrons</strong> via the po<strong>la</strong>rized bremsstrahlung and subsequent pair-creation<br />
processes in radiator and pair production targets, respectively. A new <strong>de</strong>dicated<br />
injector beam line and experimental apparatus is <strong>de</strong>scribed. The segmentation of<br />
the MeV region of the injector from the remaining CEBAF complex is <strong>de</strong>scribed as<br />
a strategy to perform the experiment during the 6-month shutdown (May-October,<br />
2011) of the 12 GeV Upgra<strong>de</strong>.<br />
† grames@j<strong>la</strong>b.org, voutier@lpsc.in2p3.fr
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