AIP Digital Archive
Electrical Engineering, Measurement and Control Technology
Simple analysis of the nearly Maxwellian angular distributions of the ribbon H− ion beams extracted from a long, narrow slit on the 8X source yields the H− temperature, kTH−. The derived kTH− are 0.1–0.3 eV for a 2-A dc discharge and 0.7–1.3 eV for a 400-A pulsed discharge. Because this diagnostic method relies on simple electronic techniques, it allows rapid study of the dependences of kTH− on the source parameters, such as gas flow and discharge current. These variations of kTH− in the 8X source are qualitatively similar to those observed for the H-atom temperature, kTH0, in the 4X source, another Penning surface-plasma source.
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