Pulse intense metal-ion diode with a vacuum arc plasma anode

Abstract

An intense pulsed ion beam of metal was extracted from a magnetically insulated ion diode operated in a mode of plasma prefill generated from a vacuum arc discharge, anode plasma source. With this ion diode, an intense metal-ion beam of a high melting-point metal (Ta) was obtained. A variety of operational modes appeared, depending on the amount of plasma in the diode gap at the initiation of the high-voltage pulse. The energy, current, and duration time of the ion beam were 20 approximately 100 keV, approximately 1 kA, and 1 mu s, respectively. Measurements of ions were performed with an ion energy analyzer or a biased ion collector located at the end of a long drift tube and a Thomson parabola ion spectrometer. The Ta ions in the first to fifth states of ionization were detected accompanied by C/sup +/, O/sup +/, F/sup +/, and H/sup +/. A Ta ion beam current of about half the total ion flux was obtained in this experiment. >