An experiment to observe propagation and compression of an intense relativistic electron beam in a tapered linear pinch resulted in beam penetration of the magnetic field constriction at the discharge's narrow end, contradicting the single-particle model verified in earlier experiments using axially uniform pinches. Transverse beam pressure overcame the net pinch pressure, expanding the magnetic constriction and allowing beam passage.
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Benford et al. (1972) studied this question.
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