Abstract
Ion plasma confinement and collective modes are investigated in a quadrupole Penning trap. The trap is operated in a novel steady-state mode, using an electron beam passing through the trap to ionize a low-pressure gas. We have discovered a regime of operation in which a Brillouin-density spheroidal ion plasma is produced. Azimuthally propagating modes are found to be in good agreement with a simple fluid model. This technique provides a new method for studying trapped plasmas near the density limit.
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