Abstract
High-β plasma is stably confined in the Ring Trap 1 (RT-1) device, a magnetospheric configuration with a levitated dipole field magnet. The plasma pressure is mainly resulted from high temperature electrons generated by electron cyclotron resonance heating (ECH), whose bremsstrulung was observed by an X-ray CCD camera. The coil support structure is the main loss route of the hot electrons, and higher-β discharge is realized by coil levitation. Confinement properties of charged particles in the magnetospheric configuration were investigated by using toroidal non-neutral plasma. Fluctuation-induced inward particle diffusion into the strong magnetic field region was realized due to the onset of diocotron (Kelvin–Helmholtz) instability.
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