Radio frequency-driven proton source with a back-streaming electron dump.
This article describes an rf ion source with a back-streaming electron dump. A quartz tube, brazed to a metal plug at one end, is fused in the center of a flat quartz plate. rf power (at 13.6 MHz) is coupled to generate hydrogen plasma using a planar external antenna bonded to the window. Bonding the water-cooled rf antenna to the quartz window significantly lowers its temperature. The water-cooled metal plug serves as the back-streaming electron dump. At 1800 W, the current density of extracted hydrogen ions reaches approximately 125 mA/cm(2).
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Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 5R0121, Berkeley, California 94720, USA. qji@lbl.gov
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