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Feasibility studies of a polarized positron source based on the bremsstrahlung of polarized electrons

Abstract : The nuclear and high-energy physics communities have shown a growing interest in the availability of high current, highly-polarized positron beams. A sufficiently energetic polarized photon or lepton incident on a target may generate, via bremsstrahlung and pair creation within a solid target foil, electron-positron pairs that should carry some fraction of the initial polarization. Recent advances in high current (> 1 mA) spin polarized electron sources at Jefferson Lab offer the perspective of creating polarized positrons from a low energy electron beam. This thesis discusses polarization transfer from electrons to positrons in the perspective of the design optimization of a polarized positron source. The PEPPo experiment, aiming at a measurement of the positron polarization from a low energy (< 10 MeV) highly spin polarized electron beam is discussed. A successful demonstration of this technique would provide an alternative scheme for the production of low energy polarized positrons and useful information for the optimization of the design of polarized positron sources in the sub-GeV energy range.
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Submitted on : Thursday, December 1, 2011 - 5:59:24 PM
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Jonathan Dumas. Feasibility studies of a polarized positron source based on the bremsstrahlung of polarized electrons. Physics [physics]. Université de Grenoble, 2011. English. ⟨NNT : 2011GRENY036⟩. ⟨tel-00647307⟩

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