Experimental Two Beam Excitation Of Plasma Oscillations

Download or read book Experimental Two-beam Excitation of Plasma Oscillations written by M. J. KOFOID and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma electron oscillations were excited in experiments in which the essential conditions of the Bohm and Gross two-beam theory were reasonably fulfilled. Independent interpenetrating electron beams were passed through a plasma of much higher charge density; in traveling through the plasma the beam electrons ionized neutral atoms and thereby produced sufficient positive ions to compensate their own charge to a reasonably high degree. With boundary electrodes present, standing waves of longitudinal plasma electron oscillations were produced. It was established that, in agreement with theory, no velocity modulation of the beam electrons prior to their entering the plasma was needed in order to cause the buildup of large amplitude oscillations. Tests were made with apparatus designed specifically to avoid such modulation. (Author).