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A developmental, 100-watt, S-band traveling-wave amplifier utilizing ceramic "periodic" permanent magnets to focus the electron beam is described. The minimum peak power output of the tube is 100 watts at a gain of at least 20 db at frequencies from 2,000 to 3,800 magacycles per second. At lower power levels, a gain of 36 db has been measured in the center of the frequency band. The operating voltages for the amplifier are below 4,000 volts. The use of ''periodic" magnets in place of conventional solenoids or permanent magnets producing uniform magnetic fields effects a considerable reduction in the weight and size of the focusing system. Constructional features of the tube which permit operation with the ''periodic'' magnet are discussed. The rf characteristics of this amplifier are evaluated, and the complete "package" assembly is described.