This anthology includes articles on experimental studies of the interaction of high-power electromag­ netic waves with collisionless plasmas and with electrons. The nonlinear interaction of waves with plasmas has been investigated both under free space conditions and in waveguides. A study of secondary-emission dis­ charges was made in order to ascertain their possible effect on measurements in waveguides. The results presented here on the interaction of high-power waves with plasmas and electrons are of interest to a wide range of physicists and engineers concerned with various questions on the interaction of electromagnetic radiation with plasmas, including microwave heating of plasmas and laser fusion. v CONTENTS An Experimental Investigation of Nonlinear Dissipation of Electromagnetic Waves in Inhomogeneous Collisionless Plasmas - G. M. Batanov and V. A. SHin........................... 1 Collisionless Absorption of Electromagnetic Waves in Plasmas and "Slow" Nonlinear Phenomena - V. 1. Barinov, 1. R. Gekker, V. A. Ivanov, and D. M. Karfidov. . . . . . . . . . . . . . . . . 25 . . . . Nonlinear Effects in the Propagation of Electron Plasma Waves in an Inhomogeneous Plasma Layer - V. A. SHin .............................. " .... .......... .. ........... ......... 53 A Study of Secondary-Emission Microwave Discharges with Large Electron Transit Angles - L. V. Grishin, A. A. Dorofeyuk, 1. A. Kossyi, G. S. Luk'yanchikov, and M. M. Savchenko . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. . . . . . . . . . . . . . . . . . . . . . 63 . . . .