MAGIC3D FDTD EM-PIC code non-conformal geometry (cut cell) implementation

The MAGIC3D [1] finite difference electromagnetic particle-in-cell (FDTD EM-PIC) code has been upgraded to include non-conformal or “cut” cells. The code solves Maxwell´s equations in Cartesian coordinates using full and partial cells cut arbitrarily along flat surfaces (Fig. 1, left). A field remapping treatment combines small volumes into neighbor cells to prevent undue Courant time step limitations. Checkouts (Fig. 1, right) have included a coax with ports and incoming 2GHz TEM wave, which rises smoothly in 5 ns at the entrance. Exiting microwave power is nearly identical for partial and full cells for this well-zoned model. Both cases compare well with the analytical impedance.