Ion Heating by the Current-Driven Turbulence in an Inhomogeneous Plasma

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  • Ion Heating by the Current Driven Turbu

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Basic experiments of turbulent heating are carried out on a non-isothermal, inhomogeneous and collisionless plasma in a uniform magnetic field. A high frequency drift wave (HFDW) with k⁄⁄\simeqk≠0 and ωpi>ω>>Ωi is excited by the parallel electron current to the direction of the magnetic field. From detailed measurements of the ion energy distribution, it is found that ions are heated isotropically and nonlocally. The ion heating is always accompanied with the large amplitude HFDW turbulence. The ion heating rate can be well explained by the semi-phenomenological quasi-linear stochastic heating theory.

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