Title :
Role of aberrations in high-current plasma lenses
Author :
Goncharov, Alexey A. ; Dobrovolsky, Andrew N. ; Litovko, Irina V. ; Protsenko, Ivan M. ; Zadorodzny, Vladimir F.
Author_Institution :
Inst. of Phys., Acad. of Sci., Kiev, Ukraine
fDate :
8/1/1997 12:00:00 AM
Abstract :
The influence of spherical and momentum aberrations on the focusing characteristics of intense ion beams in the electrostatic plasma lens (PL) is analyzed. The dependence of the ion beam focus on the uncompensated beam space charge and the finite azimuthal velocity at the PL exit is examined. Minimum focused beam radii are calculated for different system parameters and are shown to depend on the ion charge-to-mass ratio. The radial profiles of focused, multicharged, inhomogeneous ion beams were measured experimentally and compared with the theoretical predictions. We show that the PL, in principle, can be used for ion charge state analysis
Keywords :
aberrations; beam handling equipment; electrostatic lenses; ion beams; ion optics; particle beam focusing; plasma devices; space charge; aberrations; electrostatic plasma lens; finite azimuthal velocity; focused ion beams; focusing characteristics; high-current plasma lenses; inhomogeneous ion beams; intense ion beams; ion beam focus; ion charge state analysis; ion charge-to-mass ratio; minimum focused beam radii; momentum aberrations; multicharged ion beams; radial profiles; spherical aberrations; uncompensated beam space charge; Apertures; Electrodes; Electrostatic analysis; Ion beams; Lenses; Magnetic fields; Particle beams; Plasma measurements; Plasma properties; Space charge;
Journal_Title :
Plasma Science, IEEE Transactions on
