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Feasibility study of an optical resonator for applications in neutral-beam injection systems for the next generation of nuclear fusion reactors

Abstract : This work is part of a larger project called SIPHORE (SIngle gap PHOtoneutralizer energy RE-covery injector), which aims to enhance the overall efficiency of one of the mechanisms through which the plasma is heated, in a nuclear fusion reactor, i.e. the Neutral Beam Injection (NBI) system. An important component of a NBI system is the neutralizer of high energetic ion beams. SIPHORE proposes to substitute the gas cell neutralizer, used in the current NBI systems, with a photo-neutralizer exploiting the photo-detachment process within Fabry Perot cavities. This mechanism should allow a relevant NBI global efficiency of η> 60%, significantly higher than the one currently possible (η<25% for ITER). The present work concerns the feasibility study of an optical cavity with suitable properties for applications in NBI systems. Within this context, the issue of the determination of an appropriated optical cavity design has been firstly considered and the theoretical and experimental analysis of a particular optical resonator has been carried on. The problems associated with the high levels of intracavity optical power (~3 MW) required for an adequate photo-neutralization rate have then been faced. In this respect, we addressed both the problem of the thermal effects on the cavity mirrors due to their absorption of intra-cavity optical power (~1W) and the one associated to the necessity of a high powerful input laser beam (~1 kW) to feed the optical resonator.
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Donatella Fiorucci. Feasibility study of an optical resonator for applications in neutral-beam injection systems for the next generation of nuclear fusion reactors. Other [cond-mat.other]. Université Nice Sophia Antipolis, 2015. English. ⟨NNT : 2015NICE4026⟩. ⟨tel-01198454⟩

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