  MuSim is a new user-friendly program designed to interface to many different
particle simulation codes, regardless of their data formats or geometry
descriptions. It presents the user with a compelling graphical user interface
that includes a flexible 3-D view of the simulated world plus powerful editing
and drag-and-drop capabilities. All aspects of the design can be parameterized
so that parameter scans and optimizations are easy. It is simple to create
plots and display events in the 3-D viewer (with a slider to vary the
transparency of solids), allowing for an effortless comparison of different
simulation codes. Simulation codes: G4beamline 3.02 and MCNP 6.1; more are
coming. Many accelerator design tools and beam optics codes were written long
ago, with primitive user interfaces by today's standards. MuSim is specifically
designed to make it easy to interface to such codes, providing a common user
experience for all, and permitting the construction and exploration of models
with very little overhead. For today's technology-driven students, graphical
interfaces meet their expectations far better than text based tools, and
education in accelerator physics is one of our primary goals.
