Oscillation Modes of Oscillistors I Uniform Magnetic Field.

In order to investigate the dominant mode in the oscillistor oscillation, the density oscillations of m=0 and helical modes have been studied by observing simultaneously both the transmitted microwave signal through a sample whose diameter was smaller than the skin depth and the potential difference between two probes alloyed axial-symmetrically on the sample. Experiments showed the following results: (1) The m=0 mode oscillation of plasma density is predominant in oscillistor oscillation, and (2) the helical mode oscillation is excited at larger magnetic field or current than that of the m=0 mode oscillation. (3) The terminal voltage oscillation is equivalent to the m=0 mode oscillation. (4) The oscillation is excited only in a limited region 2–4 mm from the injecting junction, and this density oscillation travels along the drift direction of the minority carriers. (5) The drift velocity of the density wave increases with the distance from the exciting position.