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Magnetic field configurational study on A Helicon-Based Plasma Source for Future Neutral Beam Systems

Abstract : A helicon-based plasma source is under development and exploration at CEA-IRFM to produce an efficient and dense magnetized plasma column. The final objective of this development is the extraction and acceleration of a blade-like negative ion beam in view of future neutral beam injector systems for fusion reactors. The extraction of a negative ion beam from a magnetized plasma column requires a specific topology of the magnetic confinement, which significantly impacts the plasma parameters and wave propagation along the column. The magnetic confinement under investigation is based on water-cooled internal coils implemented under vacuum along the source (column) axis; these coils are supplied with a high DC current (~1000 A), providing the axial magnetic field (B//~10 mT). Different diagnostics developed in academic laboratories, such as 3D B-dot probes, optical emission spectroscopy and Langmuir probes, have been used for plasma characterization. The paper reports the experimental results obtained under different operating conditions of this particular magnetic confinement.
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Submitted on : Friday, November 22, 2019 - 10:31:22 AM
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Kamal M Ahmed, Riccardo Agnello, Stéphane Béchu, Gilles Cartry, H P L de Esch, et al.. Magnetic field configurational study on A Helicon-Based Plasma Source for Future Neutral Beam Systems. Plasma Sources Science and Technology, IOP Publishing, 2019, 28 (9), pp.095005. ⟨10.1088/1361-6595/ab3705⟩. ⟨hal-02375711⟩



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