• R. Pakter, L.C. Martins, F.B. Rizzato
  IF-UFRGS, Porto Alegre

Funding: Work supported by CNPq, Brazil and the US-AFOSR under Grant No. FA9550-06-1-0345.

In this paper, we investigate the combined envelope-centroid dynamics of relativistic continuous charged beams transported through a uniform focusing field and surrounded by a conducting wall. For such beams, the conducting wall screens the electric field but allows magnetic field penetration, enhancing the induced charges effect on the beam transport. As a consequence, in contrast to the case of nonrelativistic beams where the walls are shown to have little effect*, relativistic beams may have their centroid motion severely affected, leading to limitations in the total current and area occupied by the beam inside the conductor. Self-consisted simulation are used to verify the findings.

*K. Fiuza, F. B. Rizzato, and R. Pakter, Phys. Plasmas, 13, 023101 (2006).