Simulation studies of the relativistic magnetron

Summary form only given. Two-dimensional particle-in-cell (PIC) simulations of the high-power magnetron using the codes MAGIC and MASK have been performed. The simulations have been specialized to the A6 magnetron geometry, or slight variations thereof. Several scenarios with both MAGIC and MASK have been run to saturation. With MAGIC the following was observed: (1) mode competition between the π and 2π modes, and, alone, the l=5 mode (5.0 GHz), all in agreement with Buneman-Hartree theory; (2) the density profiles, which depart markedly from those of Brillouin flow, are rounded with a negative density gradient with radius; (3) the RF fields at saturation are comparable in magnitude to the applied fields; and (4) saturation of the RF is accompanied by energetic bombardment of the anode. In simulations using MASK, the π mode and the 2π mode have been observed separately. Also either the π mode or the 2π mode is seen to dominate at saturation, depending on the cathode radius