EHB 型イオン源

概要

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In the design of high current ion sources, for applications to NBI (Neutral Beam Injection) heating of fusion plasma, it is important to obtain hydrogen plasma with high proton ratio. In order to improve the properties of plasma parameters, i.e. plasma density and electron temperature, and to control the composition of extracted ion beams, we have developed the EHB (Electron Heating in Bucket) Type Ion Source. In this device, DC discharge in the bucket type configuration of magnetic field is combined with electron heating due to microwave. The multipole line cusp field is used for resonance magnetic field of electron heating as well as confinement field of plasma. It is verified that superposed RF power affects the overdense plasma (plasma frequency ƒf_p>microwave frequency ƒf_M), and improves the properties of source plasma and the extraction of ion beams. Furthermore, in the course of the study of EHB Type Ion Source, remarkable change of the proton ratio has been observed and found to be related with the condition of the wall of the vessel.
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