Abstract
(i) The focusing of an ion beam by a Morozov lens formed by a current ring in a plasma is calculated using an exact expression for the magnetic field and taking into account the nonparaxial character of the focused beam. The possible ways of optimizing such a lens are considered. (ii) Different versions of extended plasmaoptic devices in which spherical aberrations are minimized are analyzed. It is proposed to optimize extended plasma-optic devices by changing the magnetic field from the entrance end to the exit end of the solenoid in such a way that the boundary magnetic surface always coincides with the boundary surface of the focused beam. It is shown that, under the same conditions, the focusing power of the optimized devices is one to two orders of magnitude higher than that of traditional thin plasma lenses. (iii) The problem of creating a magnetic field whose strength is optimized as a function of the longitudinal coordinate is solved by the Tikhonov regularization method. (iv) An extended plasma-optic device with an optimized solenoid for focusing 1-MeV ion beams is calculated, and the ion trajectories in the device are traced. (v) It is proved expedient to develop special-purpose computer codes aimed at modeling and optimizing the existing and planned experimental plasma-optic focusing devices.
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Translated from Fizika Plazmy, Vol. 27, No. 6, 2001, pp. 540–549.
Original Russian Text Copyright © 2001 by Butenko, Ivanov.
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Butenko, V.I., Ivanov, B.I. Calculation and optimization of plasma-optic focusing devices. Plasma Phys. Rep. 27, 511–519 (2001). https://doi.org/10.1134/1.1378129
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DOI: https://doi.org/10.1134/1.1378129