High flux polarized gamma rays production: first measurements with a four-mirror cavity at the ATF

N. Delerue; J. Bonis; I. 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

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arXiv: 1110.3243

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2nd International Particle Accelerator Conference (IPAC'11), San Sebastian : Espagne (2011)

High flux polarized gamma rays production: first measurements with a four-mirror cavity at the ATF

N. Delerue¹, 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

(2011)

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.

1:	LAL - Laboratoire de l'Accélérateur Linéaire

2:	CELIA - Centre d'Etudes Lasers Intenses et Applications

3:	LMA - Laboratoire des matériaux avancés

4:	KEK - High Energy Accelerator Research Organization

Research team: ThomX

Subject(s)

Physics/Physics/Accelerator Physics

Keyword(s) : ThomX

Fulltext link:

http://fr.arXiv.org/abs/1110.3243


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