Abstract
An experimental study has been made of the high-amplitude electrical fluctuations associated with a gas discharge in a strong magnetic field.Hydrogen, helium, argon, and nitrogen gas were used at pressures from 0.3 to 100 micronsThe power spectrum on plasma probes was investigated for various values of magnetic field, gas pressure, and power input to the discharge.For the range of frequencies studied (0.5 to 4000 megacycles per second), the spectrum shows a continuous high level that increases in amplitude with decreasing pressures at all frequencies and increases with increasing magnetic field at low frequencies.A sharp dip in the spectrum was observed near the ion cyclotron frequency for discharges in hydrogen and helium. The velocity and direction of propagation for the low frequency fluctuations were determined by cross-correlating the potential variations on two neighboring probes. These fluctuations appear to propagate in the direction of the electron drift and at a velocity somewhat less than the Lorentz drift velocity.
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