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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Plasma Physics Reports</journal-id><journal-title-group><journal-title xml:lang="en">Plasma Physics Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Физика плазмы</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0367-2921</issn><issn publication-format="electronic">3034-6371</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">686396</article-id><article-id pub-id-type="doi">10.31857/S0367292125020023</article-id><article-id pub-id-type="edn">FZMALU</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>INTERACTION OF WAVES WITH PLASMA</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ВЗАИМОДЕЙСТВИЕ ВОЛН С ПЛАЗМОЙ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">ON THE POSSIBILITY OF PARAMETRIC EXCITATION OF TWO-DIMENSIONAL EIGENMODES OF ION BERNSTEIN WAVE IN ECRH EXPERIMENTS AT THE TCV TOKAMAK</article-title><trans-title-group xml:lang="ru"><trans-title>О ВОЗМОЖНОСТИ ПАРАМЕТРИЧЕСКОГО ВОЗБУЖДЕНИЯ ДВУМЕРНЫХ СОБСТВЕННЫХ МОД ИОННОЙ БЕРНШТЕЙНОВСКОЙ ВОЛНЫ ПРИ ЭЦРН-ЭКСПЕРИМЕНТАХ НА ТОКАМАКЕ TCV</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popov</surname><given-names>A. Yu.</given-names></name><name xml:lang="ru"><surname>Попов</surname><given-names>А. Ю.</given-names></name></name-alternatives><email>a.popov@mail.ioffe.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gusakov</surname><given-names>E. Z.</given-names></name><name xml:lang="ru"><surname>Гусаков</surname><given-names>Е. З.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ioffe Institute, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Физико-технический институт им. А. Ф. Иоффе РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2025</year></pub-date><volume>51</volume><issue>2</issue><issue-title xml:lang="en">VOL 51, NO2 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 51, №2 (2025)</issue-title><fpage>133</fpage><lpage>147</lpage><history><date date-type="received" iso-8601-date="2025-06-30"><day>30</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0367-2921/article/view/686396">https://journals.eco-vector.com/0367-2921/article/view/686396</self-uri><abstract xml:lang="en"><p>For typical conditions of the ECRH experiments at the TCV tokamak, a new scenario of low-threshold decay of the extraordinary wave, the frequency of which corresponds to the second harmonic of electron cyclotron frequency at the axis of the plasma column, is considered. Within the scenario, the parametric decay of the pump wave is accompanied by the excitation of a two-dimensional eigenmode of the ion Bernstein (IB) wave and a traveling (non-localized) electron Bernstein wave. It is shown that the saturation of this parametric decay instability occurs at a relatively low level, as a result of stochastic amplitudedependent damping of the IB-wave. It was discovered that there is a “second threshold” in the pump wave power, above which the stochastic damping only reduces the growth rate of primary instability, and the saturation occurs at considerably higher level, as a result of a cascade of secondary decays of the primary IB-wave, accompanied by the excitation of eigenmodes of the plasma waveguide of the IB-wave.</p></abstract><trans-abstract xml:lang="ru"><p>Для типичных условий ЭЦРН-экспериментов на токамаке TCV рассмотрен новый сценарий низкопорогового распада необыкновенной волны, частота которой соответствует второй электронной циклотронной гармоникевцентреплазменногошнура. Врамкахсценарияпараметрическийраспадволнынакачкисопровождается возбуждением двумерной собственной моды ионной бернштейновской (ИБ) волны и бегущей (нелокализованной) электронной бернштейновской волны. Показано, что насыщение этой параметрической распадной неустойчивости происходит в результате стохастического амплитудно-зависимого затухания ИБ-волны на сравнительно низком уровне. Обнаружено существование “второго порога” по мощности волны накачки, при превышении которого стохастическое затухание только уменьшает инкремент первичной неустойчивости, а насыщение происходит на значительно более высоком уровне из-за каскада вторичных распадов первичной ИБ-волны, сопровождающихся возбуждением собственных мод плазменного волновода ИБ-волны.</p></trans-abstract><kwd-group xml:lang="en"><kwd>microwave</kwd><kwd>electron Bernstein wave</kwd><kwd>ion Bernstein wave</kwd><kwd>electron cyclotron resonance heating</kwd><kwd>parametric decay instability</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>СВЧ-волна</kwd><kwd>электронная бернштейновская волна</kwd><kwd>ионная бернштейновская волна</kwd><kwd>электронный циклотронный резонансный нагрев</kwd><kwd>параметрическая распадная неустойчивость</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Westerhof E., Nielsen S.K., Oosterbeek J.W., Salewski M., de Baar M.R., Bongers W.A., Burger A., Hennen B.A., Korsholm S.B., Leipold F., Moseev D., Stejner M., Thoen D.J. // Phys. 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