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• W4387563552 abstract "Backward wave oscillation seriously degrades the stability of gyrotron travelling-wave tubes (gyro-TWTs), especially during high average/continuous wave operation. To solve this problem, a selective mode suppression structure (SMSS) based on the mode coupling principle is proposed and applied in the nonlinear beam-wave interaction region to suppress the parasitic TE11 mode. It is capable of obtaining a high power and improving the tube stability. Simulation results demonstrate that the SMSS can raise the starting current from 10 to 18 A and the starting pitch factor from 1.2 to 1.6. Based on this proposed circuit, a Ka-band TE01 mode gyro-TWT was designed, and the particle-in-cell simulation shows that it can achieve a saturated output power of over 150 kW from 29.7 to 31.7 GHz with a velocity spread of 2.2%. For verification, a SMSS is manufactured and cold tested. The measurement of S-parameters reveals that it can effectively suppress the parasitic TE11 mode." @default.
• W4387563552 created "2023-10-13" @default.
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• W4387563552 date "2023-10-01" @default.
• W4387563552 modified "2023-10-18" @default.
• W4387563552 title "Design and verification of a backward wave oscillation suppression circuit for the Ka-band gyrotron travelling-wave tube" @default.
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• W4387563552 doi "https://doi.org/10.1063/5.0164265" @default.
• W4387563552 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37823769" @default.
• W4387563552 hasPublicationYear "2023" @default.
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