Abstract

The SLC final focus system is designed to have an overall demagnification of 30:1, with a /spl beta/ at the interaction point (/spl beta/*) of 5 mm, and an energy band pass of /spl sim/0.4%. Strong sextupole pairs are used to cancel the large chromaticity which accrues primarily from the final triplet. Third-order aberrations limit the performance of the system, the dominating terms being U/sub 1266/ and U/sub 3466/ terms (in the notation of K. Brown). Using Lie algebra techniques, it is possible to analytically calculate the size of these terms, in addition to understanding their origin. Analytical calculations (using Lie algebra packages developed in the Mathematica language) are presented of the bandwidth and minimum spot size as a function of divergence at the interaction point. Comparisons of the analytical results from the Lie algebra maps and the results from particle tracking (TURTLE) are also presented. >

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