H Exp - Ion Production from Different Converter Materials

摘要

For heating plasmas and for current drive in some fusion reactors, high energy neutral beams may be required. The high neutralization efficiency of H exp - or D exp - ions makes them favorable to form neutral atoms with energies in excess of 160 keV. It has been shown that a steady-state H exp - ion beam with current greater than 1 A can be generated by a surface conversion type source with Mo being used as the converter material. In order to achieve the proper cesium coverage and thereby increasing the H exp - ion yield, the application of porous cesium-dispensing converters is being investigated. It is also possible to optimize the H exp - production by choosing the proper converter material. In this paper, we compare the negative ion yield generated by different materials (such as Mo, Ti, V, Nb, Pt, Pd, Rh, Cu, Ta, Al, Au, LaB sub 6 and stainless-steel) in the pure hydrogen and cesium-hydrogen modes of operation. (ERA citation 10:008052)