The CLIC Positron Source Based on Compton Schemes

L. Rinolfi (1) , F. Antoniou (1) , H.-H. Braun (1) , Y. Papaphilippou (1) , D. Schulte (1) , A. Vivoli (1) , F. Zimmermann (1) , E. Bulyak , P. Gladkikh , R. Chehab (2) , J. Clarke , O. Dadoun (3, 4) , P. Lepercq (3, 4) , R. Roux (4, 3) , A. Variola (3, 4) , F. Zomer (3, 4) , W. Gai , W. Liu , T. Kamitani , T. Omori , J. Urakawa , M. Kuriki , I. Pogorelsky , V. Yakimenko , T. Takahashi

1 CERN - European Organization for Nuclear Research
2 IPNL - Institut de Physique Nucléaire de Lyon
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 Dept. Accelerateurs

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 4.4x10⁹ 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.

Domaines: Physique des accélérateurs [physics.acc-ph]; Physique des Hautes Energies - Expérience [hep-ex]

L. Rinolfi, F. Antoniou, H.-H. Braun, Y. Papaphilippou, D. Schulte, et al.. The CLIC Positron Source Based on Compton Schemes. Particle Accelerator Conference (PAC 09), May 2009, Vancouver, Canada. pp.WE6RFP065. ⟨in2p3-01182738⟩