Description: Ions have been identified as a potential limitation in high current storage rings, but they are not usually thought to be a problem in electron linear accelerators. In this paper, we consider the effects of ions in the linacs of future linear colliders. Future linear collider designs call for long trains of closely spaced bunches and/or very dense bunches. Thus, significant ion densities can be generated through the collisional ionization process and ``trapping`` in a long train of bunches or through the tunneling ionization with very dense bunches. We consider two principal effects of these ions: first, they provide skew fields which cause transverse betatron coupling and increase the vertical emittance of the flat beams, and, second, the ion fields increase the rate of filamentation, making correction of the emittance dilutions more difficult; this could lead to tighter alignment tolerances. Both of these effects are verified with simulations. We will not consider other potential limitations that the ions impose. We will consider these effects in four illustrative linear collider designs: the NLC, the old NLC design, the DESY S-band design, and the Russian design, VLEPP.
Date: July 1, 1992
Creator: Raubenheimer, T. O. & Chen, P.
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