Final focusing and enhanced disruption from an underdense plasma lens in a linear collider.

In this work we examine the viability of employing an underdense plasma lens as a final focusing method for a linear e+ecollider. The underdense plasma lens is -superior to the overdense lens in that it improves focusing linearity and background event rate, but works well only for electrons. We thus consider the interaction of an ebeam which is smaller than the e+ beam at collision, a case we term “bootstrap disruption”. Potential luminosity enhancement is determined by analysis of the lens optics and simulation of the bootstrap disruption. Submitted to Phys. Rev. D , -*Work supported by the Department of Energy, contracts DE-AC03-'76SF005~.!5, DEAC03-88ER403A and W-31-109-ENG-38. SPermanent address: Physics Dept, University of California, Los Angeles, CA 90024.