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Simulational study on losses of neutral beam-injected energetic ions via collisional ripple transport in the low aspect ratio helical system CHS

  • M. ISOBE (a1), D. A. SPONG (a2), A. SHIMIZU (a1), K. TOI (a1), H. MATSUSHITA (a3), K. NAGAOKA (a1), M. NISHIURA (a1), K. MATSUOKA (a1), S. OKAMURA (a1) and S. MURAKAMI (a4)...

Abstract

Confinement and loss properties of tangentially co-injected beam ions have been studied for a standard configuration of the Compact Helical System (Rax/Bt=0.921 m/1.9 T) by use of the global particle simulation code DELTA5D. Both ripple transport and collisions with a background plasma are taken into account. It has appeared that partially thermalized, pitch-angle scattered beam ions are dominantly lost at the small major radius side. It has also been shown that the negative potential can enhance beam ions losses.

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Simulational study on losses of neutral beam-injected energetic ions via collisional ripple transport in the low aspect ratio helical system CHS

  • M. ISOBE (a1), D. A. SPONG (a2), A. SHIMIZU (a1), K. TOI (a1), H. MATSUSHITA (a3), K. NAGAOKA (a1), M. NISHIURA (a1), K. MATSUOKA (a1), S. OKAMURA (a1) and S. MURAKAMI (a4)...

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