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Amplification passive d'un laser à fibre optique dans une cavité Fabry-Perot : application à la production de rayonnement gamma par diffusion Compton inverse

Abstract : The requirement to prove the existence of news particles like quarks and the Higgs boson has led the development of two news branches for the research: the high energy physics or particle physics, dedicated to experimentally prove the existence of these new particles then to study their properties and the accelerator physics, dedicated to develop particles accelerators for the high energy physic. In this context, polarized electrons/positrons high luminosity linear collider of known and scalable energy might enable more precise studies of particles with energy around the TeV such as the Higgs boson. To that end, the International Linear Collider (ILC) project is being designed and it is in this framework that this PhD thesis takes place. One of the critical points of the ILC is the polarized positrons source. Without going through further explanation on the physical process of polarized positrons production, we point out that they are produced when circularly polarized gamma rays interact with mater. Thus, the critical point is the circularly polarized gamma-ray source. A technical solution for this source is the Compton backscattering and in the end, this thesis takes place in the framework of R&D for high average power laser systems enslaved to Fabry-Perot cavities for polarized gamma-ray production by Compton backscattering. In the first part, we present this thesis context, the Compton backscattering principle and the choice for an optical architecture based on a fiber laser and a Fabry-Perot cavity. We finish by enumerating several possible applications for Compton backscattering which shows that the work presented here might benefits from technology transfer through others research fields. In the second part, we present the different fiber laser architecture studied as well as the results obtained. In the third part, we remind the operating principle of a Fabry-Perot cavity and present the one used for our experiment as well as its specificities. In the fourth part, we address the Compton backscattering experiment which enables us to present the joint utilization of a fiber laser and a Fabry-Perot cavity in a particles accelerator to generate gamma rays for the first time to our knowledge. The experimental apparatus as well as the results obtained are thus presented. In the end, we summarize the results presented in this manuscript and propose different evolution possibilities for the system in a general conclusion.
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https://tel.archives-ouvertes.fr/tel-00837822
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Submitted on : Monday, June 24, 2013 - 1:47:13 PM
Last modification on : Friday, October 23, 2020 - 4:58:27 PM
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  • HAL Id : tel-00837822, version 1

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François Labaye. Amplification passive d'un laser à fibre optique dans une cavité Fabry-Perot : application à la production de rayonnement gamma par diffusion Compton inverse. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2012. Français. ⟨NNT : 2012PA112328⟩. ⟨tel-00837822⟩

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