Speaker
Description
Tracking through RF cavities is complicated due to the presence of
time-varying electric and magnetic fields, which are not amenable to
algorithms developed for static fields.
Many simulation programs use simplified models that neglect transverse focusing
even though it can play an important role at low energies.
Other programs track using field maps which can be slow and potentially non-Maxwellian
(and therefore not symplectic) if interpolation is needed to calculate the fields.
To avoid some of these problems, presented here is an RF cavity model which
is symplectic and computationally efficient.
Spin tracking is included and transfer maps of arbitrary order can be computed.
Additionally, DC solenoid and multipole components can easily be included.
This model is an extension of the work of Rosenzweig and Serafini extended to avoid
the ultra-relativistic approximation. The model has been incorporated as part of the Bmad and SciBmad ecosystems of libraries and programs.
Funding Agency
US Department of Energy from grant: DE-SC0025351
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