Beam trapping in high-current cyclic accelerators with strong-focusing fields. Memorandum report, January-December 1984

Technical Report · Wed Mar 06 04:00:00 EST 1985

OSTI ID:5781966

Sprangle, P; Kapetanakos, C A

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.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 5781966
• Report Number(s): AD-A-151392/8/XAB; NRL-MR-5458
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATORS
BEAM OPTICS
BEAMS
CHARGED PARTICLES
CYCLIC ACCELERATORS
ELECTRON BEAMS
ENERGY RANGE
FOCUSING
LEPTON BEAMS
MAGNETIC FIELDS
PARTICLE BEAMS
RELATIVISTIC RANGE
TRAPPING