M.D. Woodley, P.J. Emma (SLAC)
Correction of betatron coupling can be important in many applications to prevent dilution of the beam emittance. In future linear colliders the luminosity will depend on maintaining the small emittance aspect ratio delivered by the damping rings. In order to minimize the projected vertical emittance, especially for a flat beam, it is necessary to remove all cross-plane correlations. Experience at the Stanford Linear Collider has shown that the coupling correction can be a very difficult problem when provisions are not made at the design stage for reliably measuring and correcting all four phases of betatron coupling. This paper describes the proposed NLC coupling correction and emittance diagnostics sections, and suggests a tuning procedure for minimizing transverse coupling. The results of simulations of the measurement and correction process will also be presented.
* Work supported by the U.S. Department of Energy under Contract DE-AC02-76SF00515
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