The radial distribution of a nonneutral electron cloud confined in a magnetic mirror was measured. The cloud is compressed by the magnetic field to a final radius of 4 mm from an initial radius of 4.5 cm with a final kinetic energy of 0.3 MeV and 2×{}10¹¹ electrons. The radial distribution of the cloud is hollow up to 150 {μ}sec after injection. When the cloud is neutralized by a background plasma, filling in of the center does not occur.
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Eckhouse et al. (1979) studied this question.
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