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The beam physics group of Hiroshima University has developed compact plasma trap systems to explore diverse fundamental aspects of space-charge-dominated beam dynamics. At present, two Paul ion traps are in operation, one more under construction, and a Penning-Malmberg type trap is also working. These very compact, accelerator-free experiments are based on the isomorphism between non-neutral plasmas in a trap and charged-particle beams traveling in a periodic focusing channel. Systematic studies of coherent betatron resonances, ultralow-emittance beam stability, and halo formation are in progress employing both types of traps. Latest experimental results and possible future plans are addressed in this paper.
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