Paper  Title  Page 

MOPWO085  A Hybrid Technique for Computing CourantSnyder Parameters from Beam Profile Data  1073 


Funding: Work supported by ORNL/SNS, which is managed by UTBattelle, LLC, for the U.S. Department of Energy under contract DEAC0500OR22725. We present a technique for computing the CourantSnyder parameters of a chargedparticle beam from profile measurement data. Such algorithms are not new, but this particular method has very robust convergence properties resulting from a novel approach that combines both deterministic and nondeterministic methods. The general idea is as follows: given a model of the beamline, in the zerocurrent case it is possible to compute the CourantSnyder parameters directly from profile data using a deterministic, linearalgebraic approach. For the finite beam current case we can construct a smooth curve of these deterministic solutions starting from the zerocurrent solution and terminating at the finitecurrent case. We are guaranteed convergence, and convergence to the finitecurrent solution connected to the zerocurrent CourantSnyder parameters. This approach avoids the convergence issues associated with a fully iterative, nondeterministic method. The details of the technique are outlined and examples are presented using profile data taken from the SNS accelerator. 
