The Development of Stochastic Processes in COSY INFINITY
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. Certain 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: 5th International Particle Accelerator Conference, (2014) 457
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