Hybrid Methods for Simulation of Muon Ionization Cooling Channels
AbstractCOSY Infinity is an arbitrary-order beam dynamics simulation and analysis
code. It can determine high-order transfer maps of combinations of particle
optical elements of arbitrary field configurations. For precision modeling,
design, and optimization of next-generation muon beam facilities, its features
make it a very attractive code. New features are being developed for inclusion
in COSY to follow the distribution of charged particles through matter. To
study in detail some of the properties of muons passing through material, the
transfer map approach alone is not sufficient. The interplay of beam optics
and atomic processes must be studied by a hybrid transfer map–Monte Carlo
approach in which transfer map methods describe the average behavior of the
particles in the accelerator channel including energy loss, and Monte Carlo
methods are used to provide small corrections to the predictions of the
transfer map accounting for the stochastic nature of scattering and straggling
of particles. The advantage of the new approach is that it is very efficient
in that the vast majority of the dynamics is represented by fast application
of the high-order transfer map of an entire element and accumulated stochastic
effects as well as possible particle decay. The gains in speed are expected
to simplify the optimization of muon cooling channels which are usually very
computationally demanding due to the need to repeatedly run large numbers of
particles through large numbers of configurations. Progress on the development
of the required algorithms is reported.
J. Kunz, P. Snopok, M. Berz, K. Makino,
in: 7th International Particle Accelerator Conference, (2016) 1568
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