Electron Beam Focusing by an Anisotropic Solid-State Plasma

This paper proposes the use of a solid-state plasma lens in the fs linacs, in which the bunch radii of the beams are much larger than the lengths. Although gas plasmas de-grade vacuum, solid-state plasmas do not. Another prob-lem is that a return current flowing in the beam region of plasmas decreases the focusing power of the lens. By ori-entating anisotropic plasmas, we can constrain the return current, while maintaining the focusing power