A 100kW peak 50kW average coupled-cavity TWT with 10% bandwidth centered at 10GHz

This paper describes a very high power pulsed coupled-cavity TWT designed specifically for the SOSI radar being built by the Lincoln Laboratory of M.I.T. The tube delivers over 100kW of peak power at duty cycles of UP to 50%, with pulse lengths of 50 milliseconds. The tube is pulsed by use of a modulating anode and operates at a beam voltage of 42kV with a beam current of 10 amps. The measured efficiency at band center is 26% without collector depression. The tube is designed to operate over a 1000MHz bandwidth centered at 10GHz, with a saturated gain of 50dB. The electrical and mechanical design of the tube will be discussed. Measured data of gain amplitude and phase versus frequency will be shown as well as measured data of DC stability.