DEVELOPMENT OF A 300 MEGAWATT S-BAND RELATIVISTIC KLYSTRON AMPLIFIER

IN PHASE I, ANALYSIS AND COMPUTER SIMULATION IS USED TO DESIGN A 300 MW RELATIVISTIC KLYSTRON OPERATING AT 3.0 GHZ WITH A PULSE REPETITION RATE OF 1 KHZ AND A PULSE WIDTH OF 3.0 MICROSECONDS, GIVING 900 JOULES OF ENERGY PER PULSE. THE ANALYSIS AND DESIGN ARE BASED ON CONVENTIONAL KLYSTRON THEORY. AN ELECTRON GUN IS BEING DESIGNED TO OPERATE AT 695 KILOVOLTS ACCELERATING VOLTAGE, PRODUCING AN 870-AMPERE SOLID ELECTRON BEAM FROM A THERMIONIC CATHODE OPERATING IN ULTRAHIGH VACUUM. BY USING PROPRIETARY RELATIVISTIC COMPUTER CODES, AN ELECTROMAGNETIC WAVE-ELECTRON BEAM INTERACTION CIRCUIT IS BEING DESIGNED, CAPABLE OF PRODUCING 300 MW WITH A MINIMUM SATURATED GAIN OF 58 DB AND A MINIMUM EFFICIENCY OF 59.5%. A MULTIPLE CAVITY EXTENDED INTERACTION RADIO FREQUENCY (RF) OUTPUT CIRCUIT THAT WILL EFFICIENTLY EXTRACT THE RF POWER FROM THE ELECTRON BEAM IS BEING DESIGNED AND ANALYZED FOR POSSIBLE ELECTRIC FIELD BREAKDOWN. THE RF OUTPUT WAVEGUIDE SYSTEM CONSISTS OF TWO DIAMETRICALLY OPPOSED WAVEGUIDES, EACH WITH TWO CERAMIC VACUUM WINDOWS. HIGH THERMAL CAPABILITY, LONG LIFE, AND RUGGEDNESS WILL BE EMPHASIZED THROUGHOUT PHASE I. PHASE II WILL CONSIST OF COMPLETE MECHANICAL DESIGN, FABRICATION, AND RF TESTING OF THE VARIOUS COMPONENTS; THIS 300 MW S-BAND RELATIVISTIC KLYSTRON WILL ALSO BE ASSEMBLED AND PREPARED FOR TEST.