| Thème(s) : |
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Physique/Physique/Physique des accélérateurs
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| Titre : |
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High flux polarized gamma rays production: first measurements with a four-mirror cavity at the ATF |
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| Auteur : |
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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 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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ThomX |
| Résumé : |
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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. |
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| Type de publication : |
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Communications avec actes |
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Date de publication
ou d'écriture : |
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2011 |
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| Date de la présentation : |
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09/2011 |
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Nom du périodique
Titre de l'ouvrage : |
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Proceedings of IPAC2011 |
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| Audience : |
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internationale |
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| Volume : |
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TUPO002 |
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| Page/Article : |
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1446-1448 |
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| Editeur : |
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Joint Accelerator Conferences Website |
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| Nom du colloque : |
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2nd International Particle Accelerator Conference (IPAC'11) |
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| Ville du colloque : |
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San Sebastian |
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| Pays du colloque : |
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Espagne |
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| Date du colloque (début) : |
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04/09/2011 |
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| Date du colloque (fin) : |
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09/09/2011 |
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| Speaker : |
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N. Delerue |
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| Identifiant local : |
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LAL 11-273 |
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| Commentaire : |
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http://accelconf.web.cern.ch/AccelConf/IPAC2011/papers/tupo002.pdf |
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| Mot(s)-clé(s) : |
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ThomX |
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