Nonlinear /spl delta/ F simulation studies of intense charged particle beams with large pressure anisotropy

In this paper, a 3D nonlinear perturbative particle simulation code, (BEST) is used to systematically study the stability properties of intense nonneutral charged particle beams with pressure anisotropy (P/sub /spl perp// > P/sub /spl par//). The most unstable modes are identified and their eigenfrequencies and radial mode structure are determined for axisymmetric perturbations with /spl delta///spl delta//spl theta/ = 0.