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(FTP1/19(R)) The Next Step in a Development of Negative Ion Beam Plasma Neutraliser for ITER NBI

V. M. Kulygin¹⁾, E. D. Dlougach¹⁾, E. P. Gorbunov¹⁾, E. Yu. Klimenko¹⁾, A. A. Mehed'kin²⁾, A. A. Panasenkov¹⁾, Yu. M. Pustovoit¹⁾, A. A. Skovoroda¹⁾, V. A. Smirnov¹⁾, V. A. Zhil'tsov¹⁾, V. F. Zubarev¹⁾

¹⁾ Institute of Nuclear Fusion, RRC Kurchatov Institute, Moscow, Russia
²⁾ Moscow Radio Technical Institute, Moscow, Russia

Abstract. Injectors of deuterium atom beams developing for ITER plasma heating and current drive are based on the negative ion acceleration and further neutralization with a gas target. The maximal efficiency of a gas stripping process is 60%. The replacement of the gas neutralizer by plasma one must increase the neutral yield to 80%. The experimental study overview of the microwave discharge in a multi-cusp magnetic system chosen as a base device for Plasma Neutralizer realization and the design development for ITER Neutral Beam Injectors are presented. The experimental results achieved at a plasma neutralizer model PNX-U is discussed. Plasma confinement, gas flows, ionization degree were investigated. The plasma in the volume 0.5m³ with density n_e $\sim$ 10¹⁸m^{- 3} has been achieved at power density 80kW/m³ in operation with Argon.

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IAEA 2001