Optimum extracted H(sup (minus)) and D(sup (minus)) current densities from gas-pressure-limited high-power hydrogen/deuterium tandem ion sources.

摘要

The tandem hydrogen/deuterium ion source is modelled for the purpose of identifying the maximum current densities that can be extracted subject to the gas-pressure constraints proposed for contemporary beam-line systems. Optimum useful extracted current densities are found to be in the range of approximately 7 to 10 mA cm(sup (minus)2). The sensitivity of these current densities is examined subject to uncertainties in the underlying atomic/molecular rate processes; A principal uncertainty remains the quantification of the molecular vibrational distribution following H(sub 3(sup +)) wall collisions.