Summary
The space charge compensation of round electron as well as ion beams is treated, using the equivalence of the KV envelope equation to the paraxial-ray equation. The compensation of cold beams is simulated first, solving the radial Poisson equation for a beam with uniform charge distribution and a compensating particle distribution according to Boltzmann's law. For maximum compensation a simple relation is obtained between the temperature of the compensating particles and the central degree of compensation. In contrast to simple expectations, the compensating particles concentrate closer to the beam for a higher degree of compensation. The focusing of thermal beams then is treated by extending the Pierce-Walker theory by an emittance term, finding the self-consistent distribution functions for thermal beams. The compensation of these beams gives similar results to those found for cold beams.
Similar content being viewed by others
References
J. R. Pierce andL. R. Walker:J. Appl. Phys.,24, 1328 (1953).
J. D. Lawson:The Physics of Charged Particle Beams, 2nd edition (Clarendon Press, Oxford, 1988), p. 201.
J. Struckmeier, J. Klabunde andM. Reiser:Part. Accel.,15, 47 (1984).
T. P. Wangler, K. R. Crandall, R. S. Mills andM. Reiser:IEEE Trans. Nucl. Sci.,32, 2196 (1985).
R. Becker andN. Zoubek:Proceedings of the LINAC-84, GSI-84-11 (1984), p. 342.
P. Lapostolle: CERN-ISR/DI-70-36 (1970).
J. Lawson:Plasma Phys.,17, 567 (1975).
L. Brillouin:Phys. Rev.,67, 260 (1945).
M. Reiser:Part. Accel.,8, 167 (1978).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Becker, R. Space charge compensation of thermal beams. Nuov Cim A 106, 1613–1619 (1993). https://doi.org/10.1007/BF02821258
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02821258