1. Optimizing the Parameters of a 12-Cavity Rising-Sun Relativistic Magnetron With Single-Stepped Cavities for $\pi $ -Mode Operation.
- Author
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Liu, Meiqin, Liu, Chunliang, Wang, Zhanqi, Jiang, Weihua, and Schamiloglu, Edl
- Subjects
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RELATIVISTIC electrodynamics , *MAGNETRONS , *PARTICLE interactions , *DIFFRACTIVE scattering , *MAGNETIC coupling , *SIMULATION methods & models - Abstract
We investigated the use of single-stepped cavities instead of typical tapered cavities in an A6 magnetron with diffraction output (MDO) and a 12-cavity MDO through particle-in-cell (PIC) simulations using MAGIC
[1] and UNIPIC[2] in our earlier publications[3] –[5] . The interaction space, where the charged particles interact with the induced RF waves, was increased by replacing tapered cavities with single-stepped cavities in a 12-cavity rising-sun relativistic magnetron with diffraction output (RMDO) that the electronic efficiency of \pi -mode generation in a 12-cavity rising-sun RMDO with single-stepped cavities driven by a transparent cathode[6] with gigawatt output power level can be as high as 83% for \alpha = 12.5^{\circ } , 79% for \alpha = 17.5^{\circ } , and 82% for \alpha = 18.2^\circ at \beta = 32^\circ , where \alpha is the angle between the inner wall and the z -axis, and \beta is the angle between the outer wall and the z -axis. When \alpha , the angle between the inner wall and the z -axis, is changed, the depth of single-stepped cavities was changed. This would lead to the coupling between deep cavities and shallow cavities in the 12-cavity rising-sun MDO changing too, and which finally results in different frequencies of magnetron operation in the \pi and \beta = 32^\circ , the peak efficiency of \pi -mode generation in a 12-cavity rising-sun MDO with single-stepped cavities design is around 82% and occurs for voltage $V\sim 400$ kV ± 50 kV. This paper describes optimizing the parameters in a 12-cavity rising-sun RMDO for the desired $\pi $ -mode operation. [ABSTRACT FROM AUTHOR]- Published
- 2016
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