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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2021-57-1-64-76</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-568</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>Радиационная неустойчивость релятивистского пучка электронов, движущегося в двусвязном резонаторе</article-title><trans-title-group xml:lang="en"><trans-title>Radiation instability of a relativistic electron beam moving in a split resonator</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Анищенко</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Anishchenko</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анищенко Сергей Владимирович – кандидат физико-математических наук, старший научный сотрудник лаборатории сильноточной электроники</p><p>ул. Бобруйская, 11, 220030, г. Минск</p></bio><bio xml:lang="en"><p>Sergei V. Anishchenko – Ph. D. (Physics and Mathematics), Senior Researcher</p><p>Bobrujskaja Str., 11, 220030, Minsk</p></bio><email xlink:type="simple">sanishchenko@inp.bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0283-5795</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Барышевский</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Baryshevsky</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Барышевский Владимир Григорьевич – доктор физико-математических наук, профессор, главный научный сотрудник </p><p>ул. Бобруйская, 11, 220030, г. Минск </p></bio><bio xml:lang="en"><p>Vladimir G. Baryshevsky – Dr. Sc. (Physics and Mathematics), Professor, Chief Researcher</p><p>Bobrujskaja Str., 11, 220030, Minsk</p></bio><email xlink:type="simple">bar@inp.bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2980-7364</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мороз</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Maroz</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мороз Илья Викторович – научный сотрудник лаборатории сильноточной электроники</p><p>ул. Бобруйская, 11, 220030, г. Минск</p></bio><bio xml:lang="en"><p>Illia V. Maroz – Researcher, Institute for Nuclear Problems of Belarusian State University </p><p>Bobrujskaja Str., 11, 220030, Minsk</p></bio><email xlink:type="simple">miwa-holod@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ровба</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rouba</surname><given-names>А. А.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ровба Анатолий Анатольевич – кандидат физико-математических наук, ведущий научный сотрудник лаборатории сильноточной электроники</p><p>ул. Бобруйская, 11, 220030, г. Минск</p></bio><bio xml:lang="en"><p>Anatoli A. Rouba – Ph. D. (Physics and Mathematics), Leading Researcher</p><p>Bobrujskaja Str., 11, 220030, Minsk</p></bio><email xlink:type="simple">rouba@inp.bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт ядерных проблем Белорусского государственного университета</institution></aff><aff xml:lang="en"><institution>Institute for Nuclear Problems of Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>01</day><month>04</month><year>2021</year></pub-date><volume>57</volume><issue>1</issue><fpage>64</fpage><lpage>76</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Анищенко С.В., Барышевский В.Г., Мороз И.В., Ровба А.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Анищенко С.В., Барышевский В.Г., Мороз И.В., Ровба А.А.</copyright-holder><copyright-holder xml:lang="en">Anishchenko S.V., Baryshevsky V.G., Maroz I.V., Rouba А.А.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestifm.belnauka.by/jour/article/view/568">https://vestifm.belnauka.by/jour/article/view/568</self-uri><abstract><p> Рассмотрено развитие радиационной неустойчивости в двусвязном несимметричном резонаторе для  релятивистского случая с учетом объемного заряда пучка. В приближении малого сигнала получены выражения для потери энергии частицей, пролетающей через резонатор, и величины модуляции тока пучка. На основании аналитических и численных расчетов показано, что симметричная конфигурация обеспечивает наибольшую скорость развития неустойчивости. Установлено, что с ростом начальной энергии электронов величина модуляции тока пучка и эффективность передачи энергии от частиц электромагнитному полю убывают. Увеличение плотности пучка вносит положительный эффект в развитие радиационной неустойчивости. Полученные результаты важно учитывать при разработке генераторов электромагнитного излучения либо системы модулирования тока пучка на базе двусвязного резонатора. </p></abstract><trans-abstract xml:lang="en"><p>In this paper, we considered the radiation instability in a split asymmetric resonator for the relativistic case assuming the space charge of the beam. In the small-signal approximation,  expressions for the energy loss by a particle passing through the resonator and for the beam current modulation are obtained. Based on analytical and numerical calculations, it is shown that the symmetric configuration provides the highest growth rate of instability. It is found that with the increase of the initial electron energy, the modulation of the beam current as well as the efficiency of the energy transfer from particles to the electromagnetic field decrease. The increase of the beam density has a positive effect on the radiation instability. The results obtained have to be taken into account when developing generators of electromagnetic radiation or a system for modulating the beam current based on a split resonator.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>модуляция электронного пучка</kwd><kwd>радиационная неустойчивость пучка</kwd><kwd>объемный заряд</kwd><kwd>генерация электромагнитного излучения</kwd><kwd>сверхвысокочастотное излучение</kwd><kwd>двусвязный резонатор</kwd></kwd-group><kwd-group xml:lang="en"><kwd>modulation of an electron beam</kwd><kwd>radiation instability of a beam</kwd><kwd>space charge</kwd><kwd>generation of electromagnetic radiation</kwd><kwd>microwave radiation</kwd><kwd>split resonator</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">The split-cavity oscillator: a high-power E-beam modulator and microwave source / M. B. M. Marder[et al.] // IEEE Trans. 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