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The sensitivity of the albedo electron method in density determinations on some P/M materials is equal to 0.1%. The method offers an accurate and rapid nondestructive means of examining the distribution of porosity in specimens. Use of an accelerator in determinations by this method ensures an appreciable depth of control, enables the size of the control zone to be varied, and increases control rate tens of times compared with the hydrostatic weighing technique.

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.