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Etude du plasma secondaire créé dans le neutraliseur d'ITER pour la formation de neutres rapides

Abstract : To achieve thermonuclear fusion reactions in the ITER tokamak, additional heating is required. One of the main method to heat the core plasma ions will be the injection of energetic D0 neutrals. The neutralizer is the stage of the Neutral Beam Injector of ITER where the deuterium beam gets its properties in terms of neutral rate D0 and direction of propagation. The interaction between the 1MeV beam and the D2 neutralizing gas (~0.1Pa) creates a secondary plasma. These physical phenomena involved are presented through the analysis of the OBI-2 code results. OBI-2 is a PIC-MCC (Particle In Cell Monte-Carlo Collision) code in cylindrical geometry (2D3V) developed in the LPGP which allows to follow beam propagation and plasma particles along the neutralizer.The injection of lithium neutralizing target has been investigated and compared to deuterium one. Parametric study of the Li based neutralizer has been performed since the length and/or density of Li injected can be modified. The Li density profile has been estimated through the Monte-Carlo 3D code MC-OLIJET developed in the LPGP. The resulted profile has been implemented as an imput of the PIC-MCC code. Results show the feasibility of a lithium based neutralizer, keeping correct beam focusing and with better performance in terms of cryompump lifetime before regeneration, beam neutralization, positive ion backstreaming effect.
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Submitted on : Tuesday, January 24, 2012 - 11:40:59 AM
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  • HAL Id : tel-00662475, version 1

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Franck Duré. Etude du plasma secondaire créé dans le neutraliseur d'ITER pour la formation de neutres rapides. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112311⟩. ⟨tel-00662475⟩

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