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The effects of the amplitude nonuniformity of the magnetic field in a betatron on the forced and betatron radial oscillations of electrons during extraction (or discharge toward the target) at the end of the acceleration cycle are examined. The amplitude and phase dynamics of radial betatron oscillations are studied by means of an analog computer.

Some preliminary experimental results on the acceleration of plasma in circular waveguides are reported. The experiments were carried out in the 10-cm region with H01 and H11 waves and with various plasma injectors. Plasma bunches with an initial particle concentration of 1012 cm-3 and higher were injected with an initial velocity of 5 × 106 cm/sec from a spark source or formed directly on the axis of the waveguide with the help of a pressure differential plasma source ensuring a vacuum in the accelerator corresponding to pressures in the range 10-7 to 10-6 mm Hg. Electric probes, super high-frequency methods and an electrostatic particle energy analyser were employed for diagnostic purposes. Plasma confinement was accomplished by the use of auxiliary external magnetic fields having various configurations. Accelerated ions with energies exceeding 10 keV were obtained.

The angular distribution of electrons having an initial energy of 6.74 MeV has been studied after passage through C, Al, Cu, Sn, and Pb samples having thicknesses in the range in which multiple-scattering theory does not apply.