We present the radial compression of an electron plasma by using a rotating wall in a spindle cusp region of an axisymmetric magnetic quadrupole. The compression rate depended on the rotating frequencies and had a broad peak extending on both sides of a longitudinal (1,0) mode frequency, which was the only observed characteristic frequency. The formation of the high-density plasma is one of the important milestones for the antihydrogen formation and extraction of ultraslow spin-polarized antihydrogen beams in the spindle cusp.
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Saitoh et al. (2008) studied this question.
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