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发布者: 刘美琴 | 2016-05-26 | 933

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FEATURED STORIES - NOVEMBER 2016

"Optimizing the Parameters of a 12-Cavity Rising-Sun Relativistic Magnetron With Single-Stepped Cavities for π-Mode Operation"

by Meiqin Liu, Chunliang Liu, Zhanqi Wang, Weihua Jiang, and Edl Schamiloglu

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 particlein-cell (PIC) simulations using MAGIC and UNIPIC in our earlier publications. 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 π--mode generation in a 12-cavity rising-sun RMDO with singlestepped cavities driven by a transparent cathode with gigawatt output power level can be as high as 83% for α = 12.5°, 79% for α = 17.5°, and 82% for α = 18.2° at β = 32°, where α is the angle between the inner wall and the z-axis, and β is the angle between the outer wall and the z-axis. When α, 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 π-mode. As we know, gigawatt nanosecond output power pulse is useful for the nanoradar system, and our PIC simulations found that when a 400-kV voltage pulse of 10-ns duration is applied to a 12-cavity rising-sun MDO driven by a transparent cathode or a solid cathode, the output power of the π-mode can be as high as 1.5 GW. Without loss of generality, for α = 12.5° and β = 32°, the peak efficiency of π-mode generation in a 12-cavity risingsun MDO with single-stepped cavities design is around 82% and occurs for voltage V ~ 400 kV ± 50 kV. This paper describes optimizing the parameters in a 12-cavity rising-sun RMDO for the desired π-mode operation. more...
 

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