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Low-frequency collisionless drift waves grow intensively when electron currents parallel to a magnetic field are drawn in a single-ended Q machine. For a smaller electron drift velocity, the measured dispersion relations of the wave are consistent with the linear theory of the current-driven collisionless drift instability. The temperature of the ions is observed to increase anisotropically concomitant with the growth of the drift wave. The heating rate is found to be proportional to the wave energy estimated from the saturated frequency spectrum and its dependence on the electron drift is measured to be of the form (u/ve)4. A further increase in the electron drift results in the excitation of an ion acoustic wave and a flute-like instability.

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Articles you may be interested inSpace-charge compensation measurements in electron cyclotron resonance ion source low energy beam transport lines with a retarding field analyzera) Rev. Sci. Instrum. 85, 02A739 (2014); 10.1063/1.4854315 Retarding field energy analyzer for the JET plasma boundary Rev. Sci. Instrum. 74, 4644 (2003); A small retarding field analyzer for Auger electron spectroscopy Rev. Sci. Instrum. 45, 1212 (1974);

Reflection of ion-acoustic waves and solitary signals at a wall consisting of a grid and a plate is demonstrated in a DP-machine plasma. A velocity comparison is made between the signals supporting the identification of the nonlinear solitary pulses as solitons. The reflection coefficient for both kinds of signals is found to lie near 100~o.

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