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29 March 2024
 
  » arxiv » 1110.3243

 Article overview


High flux polarized gamma rays production: first measurements with a four-mirror cavity at the ATF
Nicolas Delerue ; J. Bonis ; Iryna Chaikovska ; R. Chiche ; R. Cizeron ; M. Cohen ; J. Colin ; P. Cornebise ; D. Jehanno ; F. Labaye ; M. Lacroix ; R. Marie ; Y. Peinaud ; V. Soskov ; A. Variola ; F. Zomer ; E. Cormier ; R. Flaminio ; L. Pinard ; S. Araki ; S. Funahashi ; Y. Honda ; T. Omori ; H. Shimizu ; T. Terunuma ; J. Urakawa ; T. Akagi ; S. Miyoshi ; S. Nagata ; T. Takahashi ;
Date 14 Oct 2011
AbstractThe next generation of e+/e- colliders will require a very intense flux of gamma rays to allow high current polarized positrons to be produced. This can be achieved by converting polarized high energy photons in polarized pairs into a target. In that context, an optical system consisting of a laser and a four-mirror passive Fabry-Perot cavity has recently been installed at the Accelerator Test Facility (ATF) at KEK to produce a high flux of polarized gamma rays by inverse Compton scattering. In this contribution, we describe the experimental system and present preliminary results. An ultra-stable four-mirror non planar geometry has been implemented to ensure the polarization of the gamma rays produced. A fiber amplifier is used to inject about 10W in the high finesse cavity with a gain of 1000. A digital feedback system is used to keep the cavity at the length required for the optimal power enhancement. Preliminary measurements show that a flux of about $4 imes10^6 gamma$/s with an average energy of about 24 MeV was generated. Several upgrades currently in progress are also described.
Source arXiv, 1110.3243
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