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Beam Trapping in High Current Cyclic Accelerators with Strong Focusing Fields.
Memorancum rept. Jan-Dec 84,
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
In cyclic induction accelerators, the energy of the particles increases slowly in synchronism with the vertical betatron magnetic field. As a consequence of the slow acceleration, the charged particles must be confined by the weak focusing magnetic field over long periods of time, and thus field errors, instabilities and radiation losses can impose limitations on the acceleration process. These limitations can be substantially relaxed if the acceleration were to occur rapidly, say over a few microseconds. An appropriate name for such an accelerator is REBA-TRON Rapid Electron Beam Accelerator. This paper considers a possible mechanism which could trap a high current electron beam in the strong focusing magnetic fields of the rebatron. We investigate a possible mechanism for trapping an intense relativistic electron beam confined by strong focusing fields. In our model the electron beam is assumed to be injected into torsatron fields off axis, near the chamber walls. The finite resistivity of the walls results in a drag force on the beam centroid which may cause the beam to spiral inward towards the axis of the chamber. We have analyzed this mechanism and obtained decay rates for the inward spiraling beam motion. Keywords include Accelerators, Intense beams, Beam trapping, Recirculating beams, Strong focusing, and Torsatron fields.
APPROVED FOR PUBLIC RELEASE