Abstract
A 350 watt c-w, periodic permanent magnet focused X-band traveling-wave amplifier has recently been developed by the Hughes Aircraft Company. The tube provides 40 db gain over a 10% bandwidth, and therefore can be driven by commercially available backward wave oscillators. The operating voltage is 10 kv. at 0.35 amps. The major problem posed by this high average power operation is heat dissipation of the r-f circuit and of the loss. To obtain adequate circuit dissipation with periodic focusing, a coupled cavity slow wave circuit is used. The cavity walls and drift tubes are made partly of iron to serve as pole pieces for the periodic focusing structure. Copper is used foe the remainder of the walls to provide the required heat dissipation. Backward loss is provided by completely severing the circuit in three places and absorbing the r-f power in ceramic terminations. The terminations are made of ceramic loaded with the proper amount of silicon carbide to match them to the slow-wave circuit, and are capable of dissipating up to 75 watts. The lightweight periodic focusing makes the tube ideally suited for airborne application; the complete weight is only 17 lbs. The tube is rugged, being made entirely of metal and ceramic. The focusing magnets are temperature compensated for operation in ambients up to 150°C.
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