IMPROVED RELATIVISTIC KLYSTRON DESIGNS FOR COMPACT HIGH GRADIENT PURE MMODE ACCELERATOR APPLICATIONS

THR RECENTLY DEVELOPED PURE MODE OF CHARGED PARTICLE BEAM WEAPON (CPBW) PROPAGATION WILL REQUIRE DEVELOPMENTS IN HIGH CURRENT, HIGH GRADIENT RF ACCELERATORS IF DEPLOYMENT ON MOBILE PLATFORMS IS TO BE FEASIBLE. IT APPEARS THAT RELATIVISTIC KLYSTRONS ARE LIKELY TO BE THE MOST FAVORABLE CANDIDATE FOR EFFICIENTLY GENERATING THE RF POWER TO DRIVE THESE ACCELERATORS. CURRENT DESIGNS FOR HIGH GRADIENT RF ACCELERATORS AIMED AT PURE MODE PROPAGATION EXPERIMENTS ARE DOMINATED BY THE SIZE AND WEIGHT OF THE HIGH POWER RF DRIVE SOURCES. RECENT STUDIES AT SRL INDICATE THAT MOBILE PURE-MODE ACCELERATORS WILL BE FEASIBLE ONLY IF THE SIZE AND WEIGHT OF THESE ACCELERATORS CAN BE REDUCED. GRADIENTS IN EXCESS OF 200 MEV/METER APPEAR FEASIBLE WITH ACCELERATOR STRUCTURE WEIGHTS OF LESS THAN 100 KG/GEV. HOWEVER, THE WEIGHT CORRESPONDING TO THE INDUCTION LINAC-BASED RELATIVISTIC KLYSTRON DRIVERS WOULD CURRENTLY EXCEED 10,000 KG/GEV. OUR GOAL WOULD BE TO DESIGN AN OPTIMIZED INDUCTION LINAC-DRIVEN RELATIVISTIC KLYSTRON WHICH WOULD DEMONSTRATE AN ORDER OF MAGNITUDE REDUCTION IN SIZE AND WEIGHT OVER THE CURRENT STATE-OF-THE-ART WHILE PROVIDING IMPROVED PERFORMANCE.