Initial Experience in Ion Production Using an Ultra-High Power Density Method

摘要

A mechanism to adjust the cross-section of the arc column of a cold cathode P.I.G. ion source was developed. The cross-section of the plasma column, and therefore the electron flux density, can be adjusted over a wide range with a fixed ion source power. Arc columns of up to about 370 kW/cm exp 2 and about 140 kW/cm exp 3 were achieved. With this ultra-high power density, a great improvement on ion production was obtained. The peak beam currents of the doubly charged He-3 and He-4 were increased from 150 mu A to 750 mu A and from 50 mu A to 400 mu A respectively in a compact cyclotron. (ERA citation 01:024301)