Theoretical Studies on the Formation of a Compressed 25-MeV Electron Ring in a Static Magnetic Field

The possibility of forming an electron ring by axial injection of a 25-MeV beam into a solenoidal, static magnetic field was investigated. Single-particle dynamics calculations were carried out with a computer program called HELIX. The effects of finite emittance and energy spread, which result in axial expansion of the ring in the compression phase, were studied for several coil configurations. Methods of stabilizing the electron ring are discussed and estimates of self-focusing conditions by ion loading (Bennett pinch) are presented.