Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT
The rectangular gyrotron traveling wave tube (gyro-TWT) with a large aspect ratio (<i>α</i>) has the potential to achieve megawatt-class output power. As an essential component of gyro-TWT, a novel overmoded Ka-band mode converter with an <i>α</i> of 6.19 is designed, analyze...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/7/1111 |
| _version_ | 1797416926011457536 |
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| author | Chaoxuan Lu Wei Jiang Zewei Wu Guo Liu Jianxun Wang Youlei Pu Yong Luo |
| author_facet | Chaoxuan Lu Wei Jiang Zewei Wu Guo Liu Jianxun Wang Youlei Pu Yong Luo |
| author_sort | Chaoxuan Lu |
| collection | DOAJ |
| description | The rectangular gyrotron traveling wave tube (gyro-TWT) with a large aspect ratio (<i>α</i>) has the potential to achieve megawatt-class output power. As an essential component of gyro-TWT, a novel overmoded Ka-band mode converter with an <i>α</i> of 6.19 is designed, analyzed, and cold tested in this paper. Based on the magnetic dipole moment theory, the rectangular overmoded TE<sub>01</sub> mode is excited via the rectangular fundamental TE<sub>10</sub> mode. The cutoff waveguide is applied to prevent electromagnetic wave transport to the magnetron injection gun (MIG) region and also guarantee higher power electron beam transportation. Simulations predict an operation bandwidth higher than 4 GHz and greater than 99.8% mode purity between 33–37 GHz. To verify this design, the mode converter is manufactured and cold tested. The back-to-back measurement results exhibit a good agreement with the simulation. With similar topologies, the rectangular overmoded TE<sub>01</sub> mode can be excited in a different <i>α</i>. |
| first_indexed | 2024-03-09T06:11:25Z |
| format | Article |
| id | doaj.art-43412f42ca5444c7967945f5bdeb1a23 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T06:11:25Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-43412f42ca5444c7967945f5bdeb1a232023-12-03T11:58:05ZengMDPI AGMicromachines2072-666X2022-07-01137111110.3390/mi13071111Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWTChaoxuan Lu0Wei Jiang1Zewei Wu2Guo Liu3Jianxun Wang4Youlei Pu5Yong Luo6School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, ChinaThe rectangular gyrotron traveling wave tube (gyro-TWT) with a large aspect ratio (<i>α</i>) has the potential to achieve megawatt-class output power. As an essential component of gyro-TWT, a novel overmoded Ka-band mode converter with an <i>α</i> of 6.19 is designed, analyzed, and cold tested in this paper. Based on the magnetic dipole moment theory, the rectangular overmoded TE<sub>01</sub> mode is excited via the rectangular fundamental TE<sub>10</sub> mode. The cutoff waveguide is applied to prevent electromagnetic wave transport to the magnetron injection gun (MIG) region and also guarantee higher power electron beam transportation. Simulations predict an operation bandwidth higher than 4 GHz and greater than 99.8% mode purity between 33–37 GHz. To verify this design, the mode converter is manufactured and cold tested. The back-to-back measurement results exhibit a good agreement with the simulation. With similar topologies, the rectangular overmoded TE<sub>01</sub> mode can be excited in a different <i>α</i>.https://www.mdpi.com/2072-666X/13/7/1111gyro-TWTrectangular overmoded TE<sub>01</sub> modemode converter |
| spellingShingle | Chaoxuan Lu Wei Jiang Zewei Wu Guo Liu Jianxun Wang Youlei Pu Yong Luo Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT Micromachines gyro-TWT rectangular overmoded TE<sub>01</sub> mode mode converter |
| title | Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT |
| title_full | Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT |
| title_fullStr | Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT |
| title_full_unstemmed | Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT |
| title_short | Design and Measurement of a Novel Overmoded TE<sub>01</sub> Mode Converter for a Rectangular Gyro-TWT |
| title_sort | design and measurement of a novel overmoded te sub 01 sub mode converter for a rectangular gyro twt |
| topic | gyro-TWT rectangular overmoded TE<sub>01</sub> mode mode converter |
| url | https://www.mdpi.com/2072-666X/13/7/1111 |
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