Abstract
A microwave radiometric technique has been used to study the positive column instability in pulsed nitrogen discharges. The technique involves monitoring the effective temperature of microwave radiation as a function of the longitudinal magnetic field. The critical magnetic field Bc for the onset of the instability is found to be dependent on both the discharge current and the duration of the excitation pulse. The experimental results are consistent with an explanation based on significant cumulative ionization.The plasma became turbulent at progressively lower values of magnetic field above Bc as the discharge current was increased. Further increase in current led to the unstable regime beyond Bc reverting back to stability on progressively increasing the magnetic field.
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