Hybrid Methods for Muon Accelerator Simulations with Ionization Cooling
AbstractMuon ionization cooling involves passing particles through solid or liquid absorbers.
Careful simulations are required to design muon cooling channels. New features have been developed
for inclusion in the transfer map code COSY Infinity to follow the distribution of charged
particles through matter. To study the passage of muons 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 deterministic
behavior of the particles, and Monte-Carlo methods are used to provide corrections accounting for
the stochastic nature of scattering and straggling of particles. The advantage of the new approach is
that the vast majority of the dynamics are represented by fast application of the high-order transfer
map of an entire element and accumulated stochastic effects. The gains in speed are expected to simplify
the optimization of cooling channels which is usually computationally demanding. Progress
on the development of the required algorithms and their application to modeling muon ionization
cooling channels is reported.
J. Kunz, P. Snopok, M. Berz, K. Makino,
Journal of Instrumentation (JINST), 13 (2018) P07026.
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