High-frequency Ion Source Plasma Characteristics Studied

Three typical ion source, Radio-frequency ion source, Duoplasmatron ion source and Penning ion source, are usually used in Neutron Generator. Among of them, Radio-frequency ion source is in most wide used for the reasons of its high proton content, long life and reliable performance, etc.H-type radio-frequency ion source is a kind of plasma ion source. During ion source operating, alternating axial magnetic field and azimuthal electric field in discharge tube ionize hydrogen gas purified by hot palladium pipe, and form plasma, hi fifties year, research reports studied on RF ion source are numerous however most of them are concerned about application, and research reports relevant to discharge theory or experiment model are unfrequent.This paper is mostly divided into following four parts:(1) Chapter n. Distribution of electromagnet field in the space of H-type RF ion source is worked out derivation from Maxwell equations, and three-dimensional vector graphs of E and B in the space of RF ion source are calculated and plotted by Mafia software. The conclusion that EZ is more important during the breakdown of RF ion source is made out by comparing EZ and E 6 before breakdown, and then, the breakdown criterion of RF ion source is deduced, and the relation between breakdown voltage and pressure is analyzed too.(2) Chapter ffl and chapter IV. Plasma characteristics of a RF ion source are investigated by emission spectroscopy. The spatiotemporal spectral line intensities of the first three atomic lines in Hydrogen Bahner series ( λ =656.28,486.13,434.05nm) of RF ion source plasma, are measured with calibrated Optical Multichannel Analyzer (OMA). Some plasma parameters, including electron temperature, hydrogen atom density and hydrogen ion density, are calculated and analyzed Using Partial Local Thermodynamic Equilibrium (PLTE) theory and Abel transform.(3) Chapter V. Plasma characteristics of RF ion source is investigated. A zero-dimensional numerical dynamic Colisional Radiative Atomic and Molecular (CRAM) Model is suggested to simulate the microphysical process. All species' population number densities in plasma are calculated in non-thermodynamics equilibrium condition, and proton content in extracted ion current are measured with 60?magnetic analyzer.(4) Chapter VI. The theory of ion curren extraction of RF ion source is investigated, the reason of emission surface formation and its effect on ion curren extraction are reasearched emphatically. Distributions of electrostatic field in the space of ion curren extraction are simulationed with ANSYS in different structures. Finally, the characteristics of ion curren extraction in different conditions are simulationed with MAGIC software, and the parameter of best emission surface is obtained.Some theoretical results and experimental technique in this paper is innovative to the development of RF ion source, moreover, it may be use for reference to the research of other plasma ion sources.