Abstract
The results of research of physical processes in intense negative ion beams without magnetic fields are presented. As a result of this research: (1) mechanisms of space charge compensation in negative ion beams are determined, (2) stability of compensated states with respect to excitation of plasma oscillations is analyzed, (3) mechanisms of nonlinear limitation of oscillation amplitudes are determined, and (4) values of steady and alternating fields in the beam are found and their influence on transport characteristics of the beams is estimated. It is demonstrated that ion-ion instability at low gas pressure may lead to catastrophic consequences: practically total decompensation of the beam and unacceptable angular scattering. A method of stabilization of this instability, and a technique of focusing negative ion beams by space charge fields are proposed.
Published Version
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