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High flux polarized gamma rays production: first measurements with a four-mirror cavity at the ATF
Delerue N., Bonis J., Chaikovska I., Chiche R., Cizeron R. et al
Dans Proceedings of IPAC2011 - 2nd International Particle Accelerator Conference (IPAC'11), San Sebastian : Espagne (2011) - http://hal.in2p3.fr/in2p3-00635065
Physique/Physique/Physique des accélérateurs
High flux polarized gamma rays production: first measurements with a four-mirror cavity at the ATF
N. Delerue ()1, J. Bonis1, I. Chaikovska1, R. Chiche1, R. Cizeron1, M. Cohen1, J. Colin1, P. Cornebise1, D. Jehanno1, F. Labaye1, M. Lacroix1, R. Marie1, Y. Peinaud1, V. Soskov1, A. Variola1, F. Zomer1, E. Cormier2, R. Flaminio3, L. Pinard3, S. Araki4, S. Funahashi4, Y. Honda4, T. Omori4, H. Shimizu4, T. Terunuma4, J. Urakawa4, T. Akagi, S. Miyoshi, S. Nagata, T. Takahashi
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
CNRS : UMR8607 – IN2P3 – Université Paris XI - Paris Sud
Centre Scientifique d'Orsay B.P. 34 91898 ORSAY Cedex
2 :  CELIA - Centre d'Etudes Lasers Intenses et Applications
CNRS : UMR5107 – Université Sciences et Technologies - Bordeaux I – CEA : DAM/CESTA
351 cours de la libération 33405 Talence
3 :  LMA - Laboratoire des matériaux avancés
CNRS : USR3264 – IN2P3 – Université Claude Bernard - Lyon I
Bâtiment 213 VIRGO 22 7 avenue Pierre de Coubertin 69622 VILLEURBANNE CEDEX
4 :  KEK - High Energy Accelerator Research Organization
University of Tsukuba
1-1 Oho, Tsukuba, Ibaraki 305-0801
The 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 $4\times10^6 \gamma$/s with an average energy of about 24 MeV was generated. Several upgrades currently in progress are also described.

Communications avec actes
Proceedings of IPAC2011
Joint Accelerator Conferences Website

2nd International Particle Accelerator Conference (IPAC'11)
San Sebastian
N. Delerue

LAL 11-273
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