Well Matched Electromagnetic Boundary in FDTD-PIC for Charged Particle Penetration

The authors address the Matched Phase Velocity method for bounding an electromagnetic (EM) domain in the MAGIC finite difference-time domain (FDTD) particle-in-cell (PIC) EM code. Reflected power is shown to be reduced 18 dB compared to the conventional port treatment. Boundary quality is preserved under penetration by charged particles. fields. This approach is versatile and provides self consistent interaction between particles and fields. The MAGIC software includes a broad variety of boundary and material properties as well as particle and field algorithms. We will make use of only a selected subset to illustrate the behavior of the improved CMPV approach. The centered MPV method for bounding an electromagnetic domain will be shown to be effective in reducing unwanted boundary reflections in the MAGIC EM code and has the pleasing symmetry of application that waves may be injected and removed from the simulation via the same numerical methodology, and does not exhibit the unstable behavior of other ABC methods when penetrated by charged particles.