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The results of electron cyclotron current drive experiments on the T-10 tokamak are presented.The total RF power was up to 2.5 MW, the electron temperature was up to 7 keV and the maximum driven current was 110 kA. The current drive efficiency qcD was approximately 0.1 A/W. The value of qcD and its dependence on the plasma parameters agree satisfactorily with the linear theory, corrected for the finite confinement time of resonant electrons. In discharges with large beta poloidal, ,9, = 3, complete replacement of the inductive current by non-inductive electron cyclotron current drive and bootstrap current was obtained.

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Principles and preliminary design considerations for microwave pulse compressors using electrically-switched Bragg reflectors were presented by Petelin, Vikharev and Hirshfield at AAC'96 (1). This paper presents results of experiments to study performance of several prototype designs of such compressors. In moderate-power tests using a plasma-switched TE 011 cavity as the active element, a 25 nsec, 1.8 MW output pulse was realized, corresponding to a peak power gain of 20:1, with an energy efficiency of 30%. A high-power prototype of a 60% energy efficient compressor is under construction that is designed to yield a 100 nsec, 100 MW output pulse with a peak power gain of 17:1. Details of this design are described.