Investigation of rising-sun magnetrons operated at relativistic voltages using three-dimensional particle-in-cell simulation
- Sandia National Laboratories, Albuquerque, New Mexico 87185-1186 (United States)
- Mission Research Corporation, Albuquerque, New Mexico 87110 (United States)
- Air Force Research Laboratory, Kirtland AFB, New Mexico 87117 (United States)
This work is an attempt to elucidate effects that may limit efficiency in magnetrons operated at relativistic voltages (V{approx}500 kV). Three-dimensional particle-in-cell simulation is used to investigate the behavior of 14 and 22 cavity, cylindrical, rising-sun magnetrons. Power is extracted radially through a single iris located at the end of every other cavity. Numerical results show that in general output power and efficiency increase approximately linearly with increasing iris width (decreasing vacuum Q) until the total Q becomes too low for stable oscillation in the {pi}-mode to be maintained. Beyond this point mode competition and/or switching occur and efficiency decreases. Results reveal that the minimum value of Q (maximum efficiency) that can be achieved prior to the onset of mode competition is significantly affected by the magnitude of the 0-space-harmonic of the {pi}-mode, a unique characteristic of rising suns, and by the magnitude of the electron current density (space-charge effects). By minimizing these effects, up to 3.7 GW output power has been produced at an efficiency of 40%. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20215198
- Journal Information:
- Physics of Plasmas, Vol. 7, Issue 2; Other Information: PBD: Feb 2000; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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