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Poster communications

The CLIC Positron Sources Based on Compton Schemes

Abstract : The CLIC polarized positron source is based on a positron production scheme in which polarized photons are produced by Compton process. Compton backscattering happens in a so-called "Compton ring" where an electron beam of 1.06 GeV interacts with a powerful laser beam amplified in an optical resonator. The circularly-polarized gamma rays are sent on to a target, producing pairs of longitudinally polarized electrons and positrons. An Adiabatic Matching Device maximizes the capture of the positrons. A normal-conducting 2 GHz Linac accelerates the beam up to 2.424 GeV before injection into the Pre-Damping Ring (PDR). The nominal CLIC bunch population is 4.4x10**9 particles per bunch. Since the photon flux coming out from a "Compton ring" is not sufficient to obtain the requested charge, a stacking process is required in the PDR. Another option is to use a "Compton Energy Recovery Linac" where a quasi-continual stacking in the PDR could be achieved. A third option is to use a "Compton Linac" which would not require stacking. We describe the overall scheme as well as advantages and constraints of the three different options.
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Poster communications
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L. Rinolfi, H.-H. Braun, Y. Papaphilippou, D. Schulte, A. Vivoli, et al.. The CLIC Positron Sources Based on Compton Schemes. Particle Accelerator Conference (PAC09), May 2009, Vancouver, Canada. Triumf Vancouver, pre-press version, pp.WE6RFP065, 2009. ⟨in2p3-00382145⟩

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