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Article Dans Une Revue Plasma Sources Science and Technology Année : 2011

Model of an inductively coupled negative ion source: I. General model description

Résumé

The experimental fusion reactor ITER will be heated by injection of a fast neutral beam generated by acceleration and neutralization of negative ions. The negative ion source used for this purpose, developed by the IPP Garching, consists of driver volumes where radio-frequency (RF) power is inductively coupled to the plasma electrons and an expansion chamber containing a magnetic filter. This paper documents the physical and numerical principles of a comprehensive fluid model of a single-driver prototype of this source. The model gives a qualitative but self-consistent two-dimensional description of the source, including the neutral gas flow, plasma chemistry, inductive RF coupling in the source driver and plasma transport through the magnetic filter. The different particle species are described by separate continuity, momentum and energy equations, including magnetic fields, inertia and viscosity, with boundary conditions accounting for surface processes. The electrostatic coupling between electrons and ions is described by the Poisson equation using a semi-implicit numerical method which modifies the sheath thickness but yields the correct sheath voltage. Steady-state results are shown for simple configurations to illustrate the influence of the neutral gas kinetics, RF coupling, and magnetic field on the plasma properties. Results for more realistic conditions are presented in a companion paper.
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hal-03808234 , version 1 (10-10-2022)

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Gerjan Hagelaar, Gwenael Fubiani, Jean-Pierre Boeuf. Model of an inductively coupled negative ion source: I. General model description. Plasma Sources Science and Technology, 2011, 20 (1), pp.015001. ⟨10.1088/0963-0252/20/1/015001⟩. ⟨hal-03808234⟩
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