Operation of a Dudnikov type Penning source with LaB6 cathodes

Leung, K. N.; DeVries, G. J.; Ehlers, K. W.; Jackson, L. T.; Stearns, J. W.; Williams, M. D.; McHarg, M. G.; Ball, D. P.; Lewis, W. T.; Allison, P. W.
February 1987
Review of Scientific Instruments;Feb1987, Vol. 58 Issue 2, p235
Academic Journal
The Dudnikov type Penning source has been operated successfully with low work function LaB6 cathodes in a cesium-free discharge. It is found that the extracted H- current density is comparable to that of the cesium-mode operation and H- current density of 350 mA/cm2 have been obtained for an arc current of 55 A. Discharge current as high as 100 A has also been achieved for short pulse durations. The H- yield is closely related to the source geometry and the applied magnetic field. Experimental results demonstrate that the majority of the H- ions extracted are formed by volume processes in this type of source operation.


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