DEVELOPMENT OF A 100 MEGAWATT X-BAND RELATIVISTIC KLYSTRON

FUTURE HIGH GRADIENT LINEAR PARTICLE COLLIDERS OPERATING AT X-BAND WITH ACCELERATION GRADIENTS EXCEEDING 100 MEV/M REQUIRE RADIO FREQUENCY (RF) SOURCES CAPABLE OF GENERATING HIGH PEAK POWER AT HIGH EFFICIENCY. TO MEET THIS NEED, ANALYSIS, COMPUTER SIMULATION, AND RF TESTING WILL BE USED TO DESIGN A 100 MW RELATIVISTIC KLYSTRON OPERATING AT 11.424 GHZ WITH 120 HZ PULSE REPETITION RATE AND A MINIMUM PULSE WIDTH OF 1.0 MICROSECOND. THE ANALYSIS, DESIGN AND SIMULATION WILL BE BASED ON CONVENTIONAL KLYSTRON THEORY. IN PHASE I, A LOW PERVEANCE ELECTRON GUN CAPABLE OF GENERATING A SOLID ELECTRON BEAM FROM A THERMIONIC CATHODE OPERATING IN ULTRA HIGH VACUUM WILL BE DESIGNED AS WELL AS AN ELECTROMAGNETIC-ELECTRON BEAM INTERACTION CIRCUIT CAPABLE OF PRODUCING 100 MW WITH A MINIMUM SATURATED GAIN OF 50 DB AND A MINIMUM EFFICIENCY OF 50%. A MULTIPLE CAVITY OUTPUT CIRCUIT CAPABLE OF EFFICIENTLY EXTRACTING THE FUNDAMENTAL RF POWER FROM THE ELECTRON BEAM WILL BE DESIGNED AND ANALYZED FOR POSSIBLE RF ELECTRIC FIELD BREAKDOWN. HIGH THERMAL CAPABILITY, LONG LIFE AND ROBUST CONSTRUCTION WILL BE EMPHASIZED. ALL CAVITIES INCLUDING THE MULTI-CAVITY OUTPUT CIRCUIT AND AN OUTPUT WAVEGUIDE ASSEMBLY WITH MULTIPLE CERAMIC WINDOWS WILL BE DESIGNED, FABRICATED AND RF TESTED. IN PHASE II, THE MECHANICAL DESIGN, FABRICATION AND RF TESTING OF THE VARIOUS SUBASSEMBLIES WILL BE COMPLETED AND THIS 100 MW X-BAND RELATIVISTIC KLYSTRON AMPLIFER WILL BE ASSEMBLED AND TESTED.