Optimization of H- output in a magnetically filtered multicusp source

On optimization of the volume production type H- ion source, the effects of both the magnetic filter position and the plasma grid bias voltage for H- output have been investigated experimentally. It is found that the H- output can be enhanced by optimizing the magnetic filter position, or the bias voltage of plasma grid. It is also confirmed that these phenomena correlate strongly with the variations of plasma parameters in the extraction region. (author)