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Achieving Long Confinement in a Toroidal Electron Plasma

AIP Conference Proceedings(2009)

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摘要
We observe the m=1 diocotron mode in a partial toroidal trap, and use it as the primary diagnostic for observing the plasma confinement. The frequency of the m=1 mode, which is approximately proportional to the trapped charge, decays on a three second timescale. The confinement time exceeds, by at least an order of magnitude, the confinement observed in all other toroidal traps for non-neutral plasmas and approaches the theoretical limit set by magnetic pumping transport. Numerical simulations that include toroidal effects are employed to accurately extract plasma charge, equilibrium position and m=1 mode amplitude from the experimental data. Future work will include attempts to withdraw the electron source in order to study confinement in a full torus.
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关键词
electron plasmas,non-neutral,toroidal confinement
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