ITER NB System: Compact Beamline and Design against Radiation (小特集 NBI:核融合炉に向けた物理・工学の進展)

概要

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The present ITER NB system includes two design features: short beamline design and vacuum insulated beam source (ion source and accelerator) which sustain 1 MV high voltage under radiation environment. The short beamline design is achieved by subdividing interior of the neutraliser into narrow channels to reduce gas conductance, and hence, the gas flow rate to ensure target thickness required for neutralisation. Optimizing the beam transmission and reionisation loss of neutral beams, the axial length of the ITER NB injector was shortened to be 23.4 m with a reasonably high injection efficiency. Three-dimensional neutron transport analyses clarified possible excess power dissipation due to radiation-induced conductivity, if the high voltage is insulated by conventional gas such as SF_6. Thus, design of vacuum insulated beam source has been established for the present ITER NB system.
社団法人プラズマ・核融合学会の論文
2005-10-25