Abstract

In situ three-dimensional electron density profile measurements have been made for the first time to study the end-hat space-charge region in a crossed-field amplifier. It has been found that a separated electron population exists in that region and is detached from the main beam when the end-hats are biased positively with respect to the sole. An investigation into the vacuum electric field profile and the overall device performance versus end-hat bias has suggested that such an electron population may be caused by a redistribution of the beam electrons by the axial and radial end-hat electric field. >

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