Design of a quasi-optical mode converter for a 170 GHz gyrotron

Shou-Xi XU; Jie YANG; Hu WANG; Zhi-Hui GENG; Rui ZHANG

doi:10.11972/j.issn.1001-9014.2022.03.006

Journal of Infrared and Millimeter Waves, Volume. 41, Issue 3, 557(2022)

Design of a quasi-optical mode converter for a 170 GHz gyrotron

Shou-Xi XU^1、*, Jie YANG^1,2, Hu WANG³, Zhi-Hui GENG¹, and Rui ZHANG¹

¹Key Laboratory of High Power Microwave Sources and Technologies，Aerospace Information Research Institute，Chinese Academy of Sciences，Beijing 101400，China

²University of Chinese Academy of Sciences，Beijing 100049，China

³Hisense Mobile Communication Technology Co.，Ltd.Qingdao 266555，China

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Figures & Tables(15)

Fig. 1. Relative power of each mode along the length of the TE_31，8 launcher

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Fig. 2. The wall deformations of the launcher

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Fig. 3. Azimuth bunching with only $δ_{1} = 0$

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Fig. 4. Longitudinal bunching with only $δ_{2} = 0$

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Fig. 5. Electric field distribution on the unrolled waveguide wall (a) 3D plot (b) intensity contour map

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Fig. 6. The schematic of the mirror system

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Fig. 7. Electric field distribution at the first mirror

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Fig. 8. Electric field distribution at the second mirror

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Fig. 9. Electric field distribution at the third mirror

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Fig. 10. Electric field distribution at the fourth mirror

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Fig. 11. Electric field distribution on the output window

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Fig. 12. Electric field 3D distribution on the output window

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Table 1. Nine TE modes and their relative powers to form a Gaussian-like distribution
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Table 1. Nine TE modes and their relative powers to form a Gaussian-like distribution
Azimuthal bunching
Axial bunching $T E_{29,9}$ （1/36） $T E_{32,8}$ （1/9） $T E_{35,7}$ （1/36）
$T E_{28,9}$ （1/9） $T E_{31,8}$ （4/9） $T E_{34,7}$ （1/9）
$T E_{27,9}$ （1/36） $T E_{30,8}$ （1/9） $T E_{33,7}$ （1/36）

Table 2. Parameters of mirrors

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Table 2. Parameters of mirrors

Mirror number	Mirror center（mm）	Mirror size（mm）	Focus length（mm）
M1	（10，60，0）	150*100	$F_{x}$ =50 $F_{z}$ =1700
M2	（-10，-80，60）	140*100	$F_{x}$ =110 $F_{z}$ =365
M3	（0，60，130）	120*100	$F_{x}$ =60 $F_{z}$ =1200
M4	（0，-90，235）	80*80	$F_{x}$ =379 $F_{z}$ =210
M5	（0，80，235）	60*60

Table 3. Performance of the mirror system
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Table 3. Performance of the mirror system
Collected normalized power Power transmission efficiency（%）
M1 0.9929 97.93
M2 0.9723 99.23
M3 0.9648 99.23
M4 0.9579 99.86
Output window 0.9566

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Shou-Xi XU, Jie YANG, Hu WANG, Zhi-Hui GENG, Rui ZHANG. Design of a quasi-optical mode converter for a 170 GHz gyrotron[J]. Journal of Infrared and Millimeter Waves, 2022, 41(3): 557

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