Design of an Axially-Modulated, Cusp Injected, Large Orbit Gyrotron for Linear Collider Applications

41308 November 20, 1996 Physical Sciences, Inc. This project will study the suitability of the Axially-Modulated, Cusp-Injected, Large Orbit Gyrotron (AMCILOG) configuration for linear collider applications. The AMCILOG has the potential for producing microwaves with efficiencies exceeding 45%. Phase I will numerically simulate the AMCILOG, finding optimum beam voltages and currents, magnetic fields, and cyclotron harmonics. For the simulations, the existing base of codes that can be used to model AMCILOG performance will be expanded by adding provisions for realizable magnetic field profiles, realistic cavity field profiles, realistic electron beam distributions, and buncher cavities. With these codes, a complete system will be designed, with particular attention paid to the details of the electron gun, input cavity, magnetic field system and output cavity. The magnetic field design will consider all regions (electron gun, magnetic compression, field reversal, and circuit region) and the output cavity will be designed for maximum efficiency. The performance of the design with respect to parameter variations will be completely characterized. Finally, an initial mechanical design will be performed. Commercial Applications and Other Benefits as described by the awardee: The AMCILOG configuration is capable in principle of efficiently generating high power microwaves in gyrotron-like output configurations at high harmonics of the cyclotron frequency. This feature would make the AMCILOG device particularly attractive for applications requiring either compact/light weight sources or high frequency (millimeter wave) signals. Such applications include, mobile and space-based radars, medical accelerators, and ECRH drivers.