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Numerical Research on Mode Competition of a Coaxial Corrugated Gyrotron With Two Electron Beams
IEEE Transactions on Plasma Science ( IF 1.5 ) Pub Date : 2020-04-01 , DOI: 10.1109/tps.2020.2978827
Shenyong Hou

A coaxial corrugated gyrotron with two electron beams is investigated on the mode competition. Its time-dependent multimode competition equations and dependence of the starting current on the static magnetic field and the current ratio are given under the two electron beams having unequal currents. On this basis, the influence of the two electron beams having different guiding center radii and currents on the multimode competition is studied by numerical calculation. Research studies show that under the total current remaining constant, the gyrotron has different startup scenarios when two electron beams with unequal currents locate at the different guiding centers. Compared with the gyrotron with one electron beam, the beam–wave interaction efficiencies of the two electron beams show a different increase. Results show that for a 170-GHz coaxial corrugated gyrotron with two electron beams, under a total current, $I$ , of 125 A, beam voltage, $U$ , of 88 kV, static magnetic field, B, of 6.81 T, pitch factor, $\alpha $ , of 1.35: 1) when one electron beam locates at $R_{\mathrm{ e}}^{(1)}=11.15$ mm and the other at $R_{\mathrm{ e}}^{(2)}=14.32, 15.56$ mm, and $K=I_{1}/I=0.38, 0.47$ , the $\mathrm {TE}_{38,20-}$ mode can depress the startup of its competing modes; when $R_{\mathrm{ e}}^{(1)}=11.15$ mm, $R_{\mathrm{ e}}^{(2)}=12.95$ mm, $K=I_{1}/I=0.56$ , the $\mathrm {TE}_{35,21+}$ mode can also depress the startup of its competing modes and 2) when the gyrotron operates steadily in the $\mathrm {TE}_{38,20-}$ mode, it has the output power and efficiency, respectively, of 4.12 MW and 38.13% at 170.07 GHz under $K=0.38$ .

中文翻译:

两电子束同轴波纹回旋管模态竞争的数值研究

研究了具有两束电子束的同轴波纹回旋管的模式竞争。在电流不等的两束电子束下,给出了其时间相关的多模竞争方程和启动电流对静磁场的依赖性和电流比。在此基础上,通过数值计算研究了导引中心半径和电流不同的两束电子束对多模竞争的影响。研究表明,在总电流保持不变的情况下,当两束电流不等的电子束位于不同的导引中心时,回旋管具有不同的启动场景。与具有一束电子束的回旋管相比,两束电子束的束波相互作用效率呈现不同的增加。 $1$ , 125 A, 电子束电压, $U$ , 88 kV, 静磁场, B, 6.81 T, 节距因子, $\alpha $ , of 1.35: 1) 当一束电子束位于 $R_{\mathrm{ e}}^{(1)}=11.15$ mm 和另一个在 $R_{\mathrm{ e}}^{(2)}=14.32, 15.56$ 毫米,和 $K=I_{1}/I=0.38, 0.47$ , 这 $\mathrm {TE}_{38,20-}$ 模式可以抑制其竞争模式的启动;什么时候 $R_{\mathrm{ e}}^{(1)}=11.15$ 毫米, $R_{\mathrm{ e}}^{(2)}=12.95$ 毫米, $K=I_{1}/I=0.56$ , 这 $\mathrm {TE}_{35,21+}$ 模式也可以抑制其竞争模式的启动和2)当陀螺仪稳定运行在 $\mathrm {TE}_{38,20-}$ 模式下,它在 170.07 GHz 下的输出功率和效率分别为 4.12 MW 和 38.13% $K=0.38$ .
更新日期:2020-04-01
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