Abstract
An experimental investigation was made of spiral instabilities in injected plasmas in a Corbino disk-shaped semiconductor subject to radial electric and axial magnetic fields. Observation of the spiral instabilities was made in p-type germanium at 77°K and in n-type germanium at room temperature. The oscillation frequencies are between 0.5 and 1.6 Mc/s and between 60 and 120 kc/s in p-type and n-type germanium respectively, and depend on the externally applied electric and magnetic fields. It was also observed that there exist some critical ranges for the values of the electric and magnetic fields for which this kind of instabilities occur. A theoretical explanation for most of the experimental results is given.
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