Code Development for Calculating Electron Beams in the Cavities of the Future High-Power Gyrotrons
This study develops a computational code for evaluating the operations of high-power gyrotrons with high-current electron beams. The analytical model describes the electromagnetic fields and electrons by the Maxwell equations and cold-fluid equations, respectively. Specifically, it estimates the out...
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| Veröffentlicht in: | Plasma and Fusion Research 2019/03/19, Vol.14, pp.2405052-2405052 |
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| container_title | Plasma and Fusion Research |
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| creator | NUMAKURA, Tomoharu KARIYA, Tsuyoshi MINAMI, Ryutaro OKADA, Maki HOJO, Toshitaka MOTOYOSHI, Fumiya IMAI, Tsuyoshi |
| description | This study develops a computational code for evaluating the operations of high-power gyrotrons with high-current electron beams. The analytical model describes the electromagnetic fields and electrons by the Maxwell equations and cold-fluid equations, respectively. Specifically, it estimates the output power of the gyrotron with electron-beam fluctuations, which occur under high beam currents. The effects of fluctuations of the intense electron flows in nonuniform magnetic fields are studied in a 1 MW gyrotron for electron cyclotron resonance plasma heating and current drive in large devices, such as the tandem mirror plasma device GAMMA10/PDX and the Large Helical Device (LHD). The rate of fluctuation growth of the electron beam and the output power of the high-power gyrotron with a fluctuated beam are calculated. In gyrotrons with a higher operating frequency (e.g., 154 GHz), significant deterioration of the electron beam and gyrotron operation is expected at beam currents exceeding 120 A. |
| doi_str_mv | 10.1585/pfr.14.2405052 |
| format | Article |
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The analytical model describes the electromagnetic fields and electrons by the Maxwell equations and cold-fluid equations, respectively. Specifically, it estimates the output power of the gyrotron with electron-beam fluctuations, which occur under high beam currents. The effects of fluctuations of the intense electron flows in nonuniform magnetic fields are studied in a 1 MW gyrotron for electron cyclotron resonance plasma heating and current drive in large devices, such as the tandem mirror plasma device GAMMA10/PDX and the Large Helical Device (LHD). The rate of fluctuation growth of the electron beam and the output power of the high-power gyrotron with a fluctuated beam are calculated. In gyrotrons with a higher operating frequency (e.g., 154 GHz), significant deterioration of the electron beam and gyrotron operation is expected at beam currents exceeding 120 A.</description><identifier>ISSN: 1880-6821</identifier><identifier>EISSN: 1880-6821</identifier><identifier>DOI: 10.1585/pfr.14.2405052</identifier><language>eng</language><publisher>Nagoya: The Japan Society of Plasma Science and Nuclear Fusion Research</publisher><subject>Beam currents ; beam fluctuation ; computational code ; Cyclotron resonance ; Cyclotron resonance devices ; Electromagnetic fields ; Electron beams ; Electron cyclotron resonance ; Electrons ; gyrotron ; high current ; Maxwell's equations ; Nonuniform magnetic fields ; output power ; Plasma ; Plasma heating ; Variations</subject><ispartof>Plasma and Fusion Research, 2019/03/19, Vol.14, pp.2405052-2405052</ispartof><rights>2019 by The Japan Society of Plasma Science and Nuclear Fusion Research</rights><rights>Copyright Japan Science and Technology Agency 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c531t-103dc758b97beee18cfd50646fdbd2eaaab6796720d21b182c2f934d4ec73a6b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1877,27901,27902</link.rule.ids></links><search><creatorcontrib>NUMAKURA, Tomoharu</creatorcontrib><creatorcontrib>KARIYA, Tsuyoshi</creatorcontrib><creatorcontrib>MINAMI, Ryutaro</creatorcontrib><creatorcontrib>OKADA, Maki</creatorcontrib><creatorcontrib>HOJO, Toshitaka</creatorcontrib><creatorcontrib>MOTOYOSHI, Fumiya</creatorcontrib><creatorcontrib>IMAI, Tsuyoshi</creatorcontrib><title>Code Development for Calculating Electron Beams in the Cavities of the Future High-Power Gyrotrons</title><title>Plasma and Fusion Research</title><addtitle>Plasma and Fusion Research</addtitle><description>This study develops a computational code for evaluating the operations of high-power gyrotrons with high-current electron beams. The analytical model describes the electromagnetic fields and electrons by the Maxwell equations and cold-fluid equations, respectively. Specifically, it estimates the output power of the gyrotron with electron-beam fluctuations, which occur under high beam currents. The effects of fluctuations of the intense electron flows in nonuniform magnetic fields are studied in a 1 MW gyrotron for electron cyclotron resonance plasma heating and current drive in large devices, such as the tandem mirror plasma device GAMMA10/PDX and the Large Helical Device (LHD). The rate of fluctuation growth of the electron beam and the output power of the high-power gyrotron with a fluctuated beam are calculated. In gyrotrons with a higher operating frequency (e.g., 154 GHz), significant deterioration of the electron beam and gyrotron operation is expected at beam currents exceeding 120 A.</description><subject>Beam currents</subject><subject>beam fluctuation</subject><subject>computational code</subject><subject>Cyclotron resonance</subject><subject>Cyclotron resonance devices</subject><subject>Electromagnetic fields</subject><subject>Electron beams</subject><subject>Electron cyclotron resonance</subject><subject>Electrons</subject><subject>gyrotron</subject><subject>high current</subject><subject>Maxwell's equations</subject><subject>Nonuniform magnetic fields</subject><subject>output power</subject><subject>Plasma</subject><subject>Plasma heating</subject><subject>Variations</subject><issn>1880-6821</issn><issn>1880-6821</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpNkE1PwzAMhiMEEmNw5RyJc0uSfqXHUfaBNAkOcI7S1Nk6dU1J0qH9ezo2pp1sy89jSy9Cj5SENOHJc6dtSOOQxSQhCbtCI8o5CVLO6PVFf4vunNsQkuYJTUeoLEwF-BV20JhuC63H2lhcyEb1jfR1u8LTBpS3psUvILcO1y32axiIXe1rcNjov3nW-94CXtSrdfBhfsDi-d6ag-fu0Y2WjYOHUx2jr9n0s1gEy_f5WzFZBiqJqA8oiSqVJbzMsxIAKFe6Skgap7oqKwZSyjLN8jRjpGK0pJwppvMormJQWSTTMhqjp-PdzprvHpwXG9PbdngpGGM8Yzxn0UCFR0pZ45wFLTpbb6XdC0rEIUcx5ChoLE45DsLkKGyclys449L6WjXwj5ML57xTa2kFtNEvJHJ-FQ</recordid><startdate>20190319</startdate><enddate>20190319</enddate><creator>NUMAKURA, Tomoharu</creator><creator>KARIYA, Tsuyoshi</creator><creator>MINAMI, Ryutaro</creator><creator>OKADA, Maki</creator><creator>HOJO, Toshitaka</creator><creator>MOTOYOSHI, Fumiya</creator><creator>IMAI, Tsuyoshi</creator><general>The Japan Society of Plasma Science and Nuclear Fusion Research</general><general>Japan Science and Technology Agency</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TB</scope><scope>7U5</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20190319</creationdate><title>Code Development for Calculating Electron Beams in the Cavities of the Future High-Power Gyrotrons</title><author>NUMAKURA, Tomoharu ; KARIYA, Tsuyoshi ; MINAMI, Ryutaro ; OKADA, Maki ; HOJO, Toshitaka ; MOTOYOSHI, Fumiya ; IMAI, Tsuyoshi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c531t-103dc758b97beee18cfd50646fdbd2eaaab6796720d21b182c2f934d4ec73a6b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Beam currents</topic><topic>beam fluctuation</topic><topic>computational code</topic><topic>Cyclotron resonance</topic><topic>Cyclotron resonance devices</topic><topic>Electromagnetic fields</topic><topic>Electron beams</topic><topic>Electron cyclotron resonance</topic><topic>Electrons</topic><topic>gyrotron</topic><topic>high current</topic><topic>Maxwell's equations</topic><topic>Nonuniform magnetic fields</topic><topic>output power</topic><topic>Plasma</topic><topic>Plasma heating</topic><topic>Variations</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>NUMAKURA, Tomoharu</creatorcontrib><creatorcontrib>KARIYA, Tsuyoshi</creatorcontrib><creatorcontrib>MINAMI, Ryutaro</creatorcontrib><creatorcontrib>OKADA, Maki</creatorcontrib><creatorcontrib>HOJO, Toshitaka</creatorcontrib><creatorcontrib>MOTOYOSHI, Fumiya</creatorcontrib><creatorcontrib>IMAI, Tsuyoshi</creatorcontrib><collection>CrossRef</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Plasma and Fusion Research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>NUMAKURA, Tomoharu</au><au>KARIYA, Tsuyoshi</au><au>MINAMI, Ryutaro</au><au>OKADA, Maki</au><au>HOJO, Toshitaka</au><au>MOTOYOSHI, Fumiya</au><au>IMAI, Tsuyoshi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Code Development for Calculating Electron Beams in the Cavities of the Future High-Power Gyrotrons</atitle><jtitle>Plasma and Fusion Research</jtitle><addtitle>Plasma and Fusion Research</addtitle><date>2019-03-19</date><risdate>2019</risdate><volume>14</volume><spage>2405052</spage><epage>2405052</epage><pages>2405052-2405052</pages><issn>1880-6821</issn><eissn>1880-6821</eissn><abstract>This study develops a computational code for evaluating the operations of high-power gyrotrons with high-current electron beams. The analytical model describes the electromagnetic fields and electrons by the Maxwell equations and cold-fluid equations, respectively. Specifically, it estimates the output power of the gyrotron with electron-beam fluctuations, which occur under high beam currents. The effects of fluctuations of the intense electron flows in nonuniform magnetic fields are studied in a 1 MW gyrotron for electron cyclotron resonance plasma heating and current drive in large devices, such as the tandem mirror plasma device GAMMA10/PDX and the Large Helical Device (LHD). The rate of fluctuation growth of the electron beam and the output power of the high-power gyrotron with a fluctuated beam are calculated. In gyrotrons with a higher operating frequency (e.g., 154 GHz), significant deterioration of the electron beam and gyrotron operation is expected at beam currents exceeding 120 A.</abstract><cop>Nagoya</cop><pub>The Japan Society of Plasma Science and Nuclear Fusion Research</pub><doi>10.1585/pfr.14.2405052</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese; EZB-FREE-00999 freely available EZB journals |
| subjects | Beam currents beam fluctuation computational code Cyclotron resonance Cyclotron resonance devices Electromagnetic fields Electron beams Electron cyclotron resonance Electrons gyrotron high current Maxwell's equations Nonuniform magnetic fields output power Plasma Plasma heating Variations |
| title | Code Development for Calculating Electron Beams in the Cavities of the Future High-Power Gyrotrons |
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