Effect of Reflection on Mode Competition and Multi-Frequency Oscillation in a High-Power Sub-THz Gyrotron: Experimental Observation and Theoretical Analysis
Equi-distantly distributed multi-peak frequency spectrum was observed in a high-power 300-GHz band gyrotron for the case of strong reflection off the vacuum window. An oscillation mode different from the design mode can oscillate by adjusting the magnetic field in the cavity. However, a large fracti...
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| Veröffentlicht in: | Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2020-06, Vol.41 (6), p.697-710 |
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| container_title | Journal of infrared, millimeter and terahertz waves |
| container_volume | 41 |
| creator | Saito, Teruo Melnikova, Maria M. Ryskin, Nikita M. Tanaka, Shunsuke Shinbayashi, Ryuji Yamaguchi, Yuusuke Fukunari, Masafumi Tatematsu, Yoshinori |
| description | Equi-distantly distributed multi-peak frequency spectrum was observed in a high-power 300-GHz band gyrotron for the case of strong reflection off the vacuum window. An oscillation mode different from the design mode can oscillate by adjusting the magnetic field in the cavity. However, a large fraction of the output wave is reflected by the vacuum window. The reflected wave returns to the cavity through an internal mode converter. The azimuthal rotating direction of the reflected wave is opposite to that of the oscillating mode. A theoretical calculation of mode competition between the oscillating co-rotating mode and the counter-rotating mode originating from the reflected wave very well reproduces the observed frequency spectrum. The multi-peak frequency spectrum stems from periodic amplitude oscillation caused by the mode competition between the co-rotating mode and the counter-rotating mode. The frequency interval between the peaks is not simply decided by the round-trip time between the cavity and the vacuum window but determined by the period of the amplitude oscillation. |
| doi_str_mv | 10.1007/s10762-020-00695-1 |
| format | Article |
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An oscillation mode different from the design mode can oscillate by adjusting the magnetic field in the cavity. However, a large fraction of the output wave is reflected by the vacuum window. The reflected wave returns to the cavity through an internal mode converter. The azimuthal rotating direction of the reflected wave is opposite to that of the oscillating mode. A theoretical calculation of mode competition between the oscillating co-rotating mode and the counter-rotating mode originating from the reflected wave very well reproduces the observed frequency spectrum. The multi-peak frequency spectrum stems from periodic amplitude oscillation caused by the mode competition between the co-rotating mode and the counter-rotating mode. The frequency interval between the peaks is not simply decided by the round-trip time between the cavity and the vacuum window but determined by the period of the amplitude oscillation.</description><identifier>ISSN: 1866-6892</identifier><identifier>EISSN: 1866-6906</identifier><identifier>DOI: 10.1007/s10762-020-00695-1</identifier><language>eng</language><publisher>New York: Springer US</publisher><subject>Amplitudes ; Classical Electrodynamics ; Competition ; Converters ; Electrical Engineering ; Electronics and Microelectronics ; Electrons ; Engineering ; Frequency spectrum ; Instrumentation ; Peak frequency ; Reflected waves ; Reflection ; Rotation</subject><ispartof>Journal of infrared, millimeter and terahertz waves, 2020-06, Vol.41 (6), p.697-710</ispartof><rights>Springer Science+Business Media, LLC, part of Springer Nature 2020</rights><rights>Springer Science+Business Media, LLC, part of Springer Nature 2020.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c385t-ebc34c04be0676c074c7f8636fa315948b91472329c9907b7e504c5008ac093a3</citedby><cites>FETCH-LOGICAL-c385t-ebc34c04be0676c074c7f8636fa315948b91472329c9907b7e504c5008ac093a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10762-020-00695-1$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10762-020-00695-1$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Saito, Teruo</creatorcontrib><creatorcontrib>Melnikova, Maria M.</creatorcontrib><creatorcontrib>Ryskin, Nikita M.</creatorcontrib><creatorcontrib>Tanaka, Shunsuke</creatorcontrib><creatorcontrib>Shinbayashi, Ryuji</creatorcontrib><creatorcontrib>Yamaguchi, Yuusuke</creatorcontrib><creatorcontrib>Fukunari, Masafumi</creatorcontrib><creatorcontrib>Tatematsu, Yoshinori</creatorcontrib><title>Effect of Reflection on Mode Competition and Multi-Frequency Oscillation in a High-Power Sub-THz Gyrotron: Experimental Observation and Theoretical Analysis</title><title>Journal of infrared, millimeter and terahertz waves</title><addtitle>J Infrared Milli Terahz Waves</addtitle><description>Equi-distantly distributed multi-peak frequency spectrum was observed in a high-power 300-GHz band gyrotron for the case of strong reflection off the vacuum window. An oscillation mode different from the design mode can oscillate by adjusting the magnetic field in the cavity. However, a large fraction of the output wave is reflected by the vacuum window. The reflected wave returns to the cavity through an internal mode converter. The azimuthal rotating direction of the reflected wave is opposite to that of the oscillating mode. A theoretical calculation of mode competition between the oscillating co-rotating mode and the counter-rotating mode originating from the reflected wave very well reproduces the observed frequency spectrum. The multi-peak frequency spectrum stems from periodic amplitude oscillation caused by the mode competition between the co-rotating mode and the counter-rotating mode. The frequency interval between the peaks is not simply decided by the round-trip time between the cavity and the vacuum window but determined by the period of the amplitude oscillation.</description><subject>Amplitudes</subject><subject>Classical Electrodynamics</subject><subject>Competition</subject><subject>Converters</subject><subject>Electrical Engineering</subject><subject>Electronics and Microelectronics</subject><subject>Electrons</subject><subject>Engineering</subject><subject>Frequency spectrum</subject><subject>Instrumentation</subject><subject>Peak frequency</subject><subject>Reflected waves</subject><subject>Reflection</subject><subject>Rotation</subject><issn>1866-6892</issn><issn>1866-6906</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp9kd1KAzEQhRdR8PcFvAp4HZ1ks8nGOynVCkpF63XIprN1Zd3UZKvWZ_Fhja0_d0IgQ-Y7ZzKcLDtkcMwA1ElkoCSnwIECSF1QtpHtsFJKKjXIzZ-61Hw7243xMUFCaLmTfQzrGl1PfE1usW5T2fiOpHPtp0gG_mmOfbN6s92UXC_avqHnAZ8X2LklGUfXtK1d9ZuEkFEze6A3_hUDuVtUdDJ6JxfL4Pvgu1MyfJtjaJ6w621LxlXE8GJ_rScP6EOa5VLvrLPtMjZxP9uqbRvx4Pvey-7Ph5PBiF6NLy4HZ1fU5WXRU6xcLhyICkEq6UAJp-pS5rK2OSu0KCvNhOI5105rUJXCAoQrAErrQOc238uO1r7z4NNmsTePfhHSJ6LhgouSKcGLRPE15YKPMWBt5mkbG5aGgflKwaxTMCkFs0rBsCTK16KY4G6G4c_6H9UnBSyLuA</recordid><startdate>20200601</startdate><enddate>20200601</enddate><creator>Saito, Teruo</creator><creator>Melnikova, Maria M.</creator><creator>Ryskin, Nikita M.</creator><creator>Tanaka, Shunsuke</creator><creator>Shinbayashi, Ryuji</creator><creator>Yamaguchi, Yuusuke</creator><creator>Fukunari, Masafumi</creator><creator>Tatematsu, Yoshinori</creator><general>Springer US</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FE</scope><scope>8FG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>P5Z</scope><scope>P62</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20200601</creationdate><title>Effect of Reflection on Mode Competition and Multi-Frequency Oscillation in a High-Power Sub-THz Gyrotron: Experimental Observation and Theoretical Analysis</title><author>Saito, Teruo ; 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An oscillation mode different from the design mode can oscillate by adjusting the magnetic field in the cavity. However, a large fraction of the output wave is reflected by the vacuum window. The reflected wave returns to the cavity through an internal mode converter. The azimuthal rotating direction of the reflected wave is opposite to that of the oscillating mode. A theoretical calculation of mode competition between the oscillating co-rotating mode and the counter-rotating mode originating from the reflected wave very well reproduces the observed frequency spectrum. The multi-peak frequency spectrum stems from periodic amplitude oscillation caused by the mode competition between the co-rotating mode and the counter-rotating mode. 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| subjects | Amplitudes Classical Electrodynamics Competition Converters Electrical Engineering Electronics and Microelectronics Electrons Engineering Frequency spectrum Instrumentation Peak frequency Reflected waves Reflection Rotation |
| title | Effect of Reflection on Mode Competition and Multi-Frequency Oscillation in a High-Power Sub-THz Gyrotron: Experimental Observation and Theoretical Analysis |
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