Helical instability in injected semiconductor plasmas

An experimental and theoretical investigation is made into the helical instability in injected semiconductor plasmas. Dispersion relations and spatial growths of the instability are studied theoretically as a function of magnetic field, injection level, and electric field. Experiments are made by launching the waves (2–30 MHz) on injected plasmas of p‐InSb with sample currents and magnetic fields in the ranges 30–150 mA and 200–1000 G, respectively. The phase shift and amplitude of the waves along the potential probes of a sample make it possible to determine the wave number, the wavelength, the phase velocity, and the spatial growth rate, and are compared in reasonable agreement with the theory. Feedback control of the launched waves as well as the spontaneous oscillations are studied, while the waves and the oscillations are compared with respect to the threshold conditions and the oscillation frequency.

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