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A new technique has been developed for the production of tightly focused intense relativistic electron beams. A collimated plume of laser blowoff plasma is injected on axis into the anode-cathode gap region of a low-impedance diode prior to the beam pulse. The electron beam is found to pinch in the diode to current densities ≥ 2 MA/cm2.
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Miller et al. (1973) studied this question.
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