Paul trap experiment to simulate intense nonneutral beam propagation through a periodic focusing field configuration

This paper describes the design concept for a compact Paul trap experimenta l configuration that fully simulates the collective processes and nonlinear transverse dynamics of an intense charged particle beam that propagates ov er large distances through a periodic quadrupole magnetic field. To summari ze, a long nonneutral plasma column (L much greater than r(p)) is confined axially by applied DC voltages (V) over cap = const. on end cylinders at z = +/-L, and transverse confinement is provided by segmented cylindrical ele ctrodes (at radius r(w)) with applied oscillatory voltages +/-V-0(t) over 9 0 degrees segments. Because the transverse focusing force is similar in wav eform to that produced by a discrete set of periodic quadrupole magnets in a frame moving with the beam, the: Paul trap configuration offers the possi bility of simulating intense beam propagation in a compact experimental fac ility. The nominal operating parameters in the experimental design are: bar ium ions (A = 137); plasma column length 2L = 2 m; wall radius r(w) = 10 cm ; plasma radius r(p) = 1 cm; maximum wall voltage (V) over cap (0) = 400 V; end electrode voltage up to (V) over cap = 500 V; and voltage oscillation frequency f(0) = 1/T = 60 kHz. (C) 2001 Elsevier Science B.V. All rights re served.