Abstract
The thermophysical characteristics of the ionizer in cesium sputter-type negative ion sources is studied by means of the heat transfer theory in this paper. A heat transfer model is given and theoretical calculations are performed. The theoretical calculations are in good agreement with experimental results. Based on the theoretical analysis the configuration of the source is improved and the calorific efficiency is increased, so that the temperature of the ionizer can reach up to 1300 K and the lifetime of the heater core of the ionizer is prolonged. The theoretical model can serve as the basis for the ionizer design of the cesium sputter-type negative ion sources. In addition, the study is also helpful for the design of the heater in the similar ion sources.
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