Preliminary Design of the NRL Modified Betatron

The principal subsystems of the NRL Modified Betatron Accelerator (MBA) have been designed. These subsystems include the air-core magnets, the mechanical structure, the vacuum system, the injector accelerator, and the pulse power capacitor banks. The MBA concept uses an applied toroidal magnetic field, B¿ (2-5 kG) to improve the stability and confinement of a multikiloamp e-beam. Trapping of an injected beam will result from varying the Bz by a few Gauss during the first poloidal bounce period. Externally driven coils will compensate the diffusion of the self magnetic field to maintain equilibrium.