回旋振荡管收集极横向磁扫描系统的设计与仿真

李晗; 杨晨; 罗积润; 樊宇; 朱敏; 郭炜

doi:10.11884/HPLPB202133.210053

回旋振荡管收集极横向磁扫描系统的设计与仿真

doi: 10.11884/HPLPB202133.210053

李晗^{1, 2,},
杨晨^{1, 2},
罗积润^{1, 2},
樊宇¹,
朱敏¹,
郭炜¹

1.
中国科学院空天信息创新研究院高功率微波源技术科学与技术重点实验室，北京 100190
2.
中国科学院大学电子电气与通信工程学院，北京 100049

基金项目: 国家高技术发展计划项目（Y8BD140353）

详细信息

作者简介:
李　晗（1995—），女，硕士研究生，从事激光应用及新型光器件研究

中图分类号: TN129
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- 被引次数: 0
出版历程
- 收稿日期: 2021-02-22
- 修回日期: 2021-06-02
- 网络出版日期: 2021-06-28
- 刊出日期: 2021-07-15

Design and simulation of the transverse magnetic scanning system of gyrotron oscillator collector

Li Han^{1, 2
,},
Yang Chen^{1, 2},
Luo Jirun^{1, 2},
Fan Yu¹,
Zhu Min¹,
Guo Wei¹

1.
The Key Laboratory of Science and Technology on High Power Microwave Sources and Technologies, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
2.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 从降低收集极表面峰值功率和平均功率入手，设计了一种由12个横向椭圆交流线圈和2个轴向直流线圈组成的磁场扫描系统。针对140 GHz、TE_28,8模、1 MW功率输出回旋振荡管收集极的设计参数，结合电磁场理论和带电粒子电磁软件仿真，获得收集极表面上电子注的峰值和平均功率密度分别不超过404.91 W/cm²和244.01 W/cm²，以及扫描长度达到443.33 mm的扫描效果，有效地缓解了收集极功率耗散和冷却的压力。
- 回旋振荡管 /
- 收集极 /
- 横向磁场扫描 /
- 椭圆线圈 /
- 功率密度
Abstract: Starting from reducing the peak power and average power on the collector surface of a gyrotron oscillator, we have designed a magnetic field scanning system composed of 12 transverse elliptical AC coils and 2 longitudinal DC coils. According to the design parameters of the collector electrode of 140 GHz, TE_{28, 8} mode, 1 MW gyrotron oscillator, and combining electromagnetic field theory with particle-in-cell (PIC) simulation program, the scanning system can realize that the peak and average power density of the electron beam on the collector surface are not more than 404.91 W/cm² and 244.01 W/cm² respectively with a scanning length of 443.33 mm, which effectively alleviates the pressure of power dissipation and cooling of the collector.
- gyrotron oscillator /
- collector /
- transverse magnetic field scanning /
- elliptical coil /
- power density

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图 1 TFSS结构示意图

Figure 1. Schematic diagram of TFSS structure

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图 2 TFSS对电子注轨迹的影响

Figure 2. Influence of TF_coils on electron beam trajectory

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图 3 TFSS电流幅度对电子注落点的影响

Figure 3. Influence of TFSS current amplitude on electron beam trajectory

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图 4 VF_coil与TF_coils对于电子注空间分布的影响

Figure 4. Influence of VF_coil and TF_coils on the spatial distribution of electron Beams

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图 5 加载VF_coil、TF_coils时收集极上轴向的功率密度分布

Figure 5. The axial power density distribution of the collector when VF_coil and TF_coils are loaded

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图 6 12个椭圆线圈构成的TF_coils相位分布

Figure 6. Phase distribution of TF_coils composed of 12 elliptical coils

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图 7 TFSS中VF_coils的个数增加时的电子注空间分布

Figure 7. The electron beam spatial distribution on the collector surface for different number of VF_coils

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图 8 调整后的TFSS模型与功率密度分布

Figure 8. Adjusted TFSS model and power density distribution

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图 9 优化后的TFSS模型结构示意图

Figure 9. Schematic diagram of optimized TFSS model structure

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表 1 回旋管部分参数

Table 1. Parameters of gyrotron

anode voltage U₀ /kV	modulated anode voltage U_m/kV	current I₀ /A	electron injection efficiency η_e/%
81	54	40	35

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表 2 不同情况下收集极上电子注的分布参数

Table 2. Electron beam parameters on the collector surface under different conditions

coils loaded on the collector	peak power density/ (W/cm²）	mean power density/ (W/cm²）	vertical scan length/ mm
non-coil	3523.40	1820.92	58.74
1VF_coil	2803.23	1363.46	78.45
6TF_coils	679.51	318.23	336.10
6TF_coils &1VF_coil	574.81	271.86	393.43

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表 3 电子注分布参数对比

Table 3. Comparison of electronic beam distribution parameters

coils loaded on the collector	peak power density/（W/cm²）	mean power density/（W/cm²）	vertical scan length/mm
6TF_coils &1VF_coil	574.81	271.86	393.43
12TF_coil &1VF_coil	688.24	353.49	303.33

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表 4 轴向扫描线圈个数不同时收集极上电子注的分布参数

Table 4. The electron beam distribution parameters on the collector surface for different number of VF_coils

coils loaded on the collector	peak power density/（W/cm²）	mean power density/（W/cm²）	vertical scan length/mm
12TF_coil &1VF_coil	688.24	353.49	303.33
12TF_coils &2VF_coils	472.99	272.29	396.67
12TF_coils &3VF_coils	633.75	327.55	326.67
12TF_coils &4VF_coils	547.14	288.69	373.33

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表 5 图8（b）中三种情况对应的收集极上轴向功率密度的分布参数

Table 5. The distribution parameters of the axial power density on the collector corresponding to the three cases in Figure 8(b)

（Z_min_TFSS，Z_max_TFSS）	peak power density/（W/cm²）	mean power density/（W/cm²）	vertical scan length/mm
（710，1545）	426.52	251.17	431.67
（720，1555）	404.91	244.01	443.33
（730，1565）	477.18	238.26	455.00

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表 6 与现有方案的参数对比

Table 6. Comparison of parameters with existing schemes

	frequency/ GHz	dissipated power /MW	peak power density/（W/cm²）	vertical scan length/mm	ampere turns of TF_coils/（kA·T）	ampere turns of VF_coils/（kA·T）	number of coils（TF，VF）
ref.[12]	W-band	0.5-1	130	480 mm	1.554（6A×259T）	0.81（5A×162T）	（6，1）
ref.[13]	140	0.1	450	−	7	0	（6，1）
ref.[14]	140	1	−	330 mm	7.9	1	（6，1）
ref.[15]	140	1	370	380 mm	−	−	（6，1）
ref.[16]	170	1	288.66	−	4	10	（6，1）
this paper	140	1.2	404.91	443.33	2.4	1.56	（12，2）

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表 7 TFSS仿真模型关键参数

Table 7. Key parameters of TFSS simulation model

type of coils	outer radius（mm）	thickness/mm	length/mm	ampere turns of single coil /（kA·turn）	number of coils	distance from coils’ center to origin/mm
TF_coils	160（SMA） 70（SMI）	30	50	2.4（6A×400T）	12	880
VF_coils	220	10	240	1.56（5.2A×300T）	2	1320

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参考文献(16)

[1]	Thumm M. State-of-the-art of high-power gyro-devices and free electron masers[J]. Journal of Infrared, Millimeter and Terahertz Waves, 2020, 41(1): 1-140. doi: 10.1007/s10762-019-00631-y
[2]	Illy S, Dammertz G, Alberti S, et al. Comparison of different collector coil concepts for high power CW gyrotrons[C]//International Conference on Infrared and Millimeter Waves. 2000: 183-184.
[3]	Baxi C B, Callis R W, Gorelov I A, et al. Thermal stress analysis of 1 MW gyrotron collector[J]. Fusion Engineering and Design, 2007, 82(5/14): 731-735.
[4]	Thumm M, Alberti S, Arnold A, et al. EU megawatt-class 140-GHz CW gyrotron[J]. IEEE Transactions on Plasma Science, 2007, 35(2): 143-153. doi: 10.1109/TPS.2007.892144
[5]	陈辉. 回旋管输出系统及收集极热分析技术[D]. 成都: 电子科技大学, 2015: 54-63. Chen Hui. Gyrotron output system and collector extreme thermal analysis technology[D]. Chengdu: University of Electronic Science and Technology of China, 2015: 54-63
[6]	Jiang W, Luo Y, Yan R. Numerical design and optimization of a curved collector for a Q-band gyro-traveling wave tube[J]. IEEE Transactions on Electron Devices, 2013, 61(1): 147-150.
[7]	Ives L, Neilson J, Song L. Improved gyrotron collectors[C]//IEEE International Vacuum Electronics Conference. 2007.
[8]	董坤, 蒋伟. 磁场扫描系统在U波段回旋行波管收集极中的应用[J]. 真空电子技术, 2019(6):85-88, 93. (Dong Kun, Jiang Wei. Application of magnetic field scanning system in U-band cyclotron traveling wave tube collector[J]. Vacuum Electronics, 2019(6): 85-88, 93
[9]	Thumm M. Recent advances in the worldwide fusion gyrotron development[J]. IEEE Transactions on Plasma Science, 2014, 42(3): 590-599. doi: 10.1109/TPS.2013.2284026
[10]	Manuilov V N, Smirnov D A, Malygin S A, et al. Numerical simulation of the gyrotron collector systems with rotating magnetic field[C]//Joint 29th International Conference on Infrared and Millimeter Waves. 2004.
[11]	郑志清, 罗勇, 蒋伟, 等. 回旋行波管收集极的热分析[J]. 强激光与粒子束, 2013, 25(3):721-726. (Zheng Zhiqing, Luo Yong, Jiang Wei, et al. Thermal analysis of cyclotron traveling wave tube collector[J]. High Power Laser and Particle Beam, 2013, 25(3): 721-726 doi: 10.3788/HPLPB20132503.0721
[12]	王亚茹, 耿志辉, 徐寿喜, 等. W波段回旋管收集极横向场扫描散焦系统的设计与仿真[J]. 真空科学与技术学报, 2016, 36(11):1247-1253. (Wang Yaru, Geng Zhihui, Xu Shouxi, et al. Design and simulation of W-band gyrotron collector transverse field scanning defocus system[J]. Journal of Vacuum Science and Technology, 2016, 36(11): 1247-1253
[13]	Illy S, Schmid M, Braune H, et al. Enhanced transversal collector sweeping for high power CW gyrotrons[C]//IEEE International Conference on Infrared. 2008.
[14]	Schmid M, Illy S, Dammertz G, et al. Transverse field collector sweep system for high power CW gyrotrons[J]. Fusion Engineering & Design, 2007, 82(5/14): 744-750.
[15]	Tang N, Guo G, Niu X, et al. Simulation of sweeping system of collector for the 140 GHz gyrotron[C]//2019 12th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies. 2019.
[16]	Illy S, Beringer M H, Kern S, et al. Collector design studies for a 1 MW cylindrical-cavity and a 4 MW coaxial-cavity gyrotron[C]//IEEE 35th International Conference on Infrared Millimeter and Terahertz Waves. 2010.