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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">nguphys</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский физический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>SIBERIAN JOURNAL OF PHYSICS</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2541-9447</issn><publisher><publisher-name>Новосибирский государственный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25205/2541-9447-2025-20-2-19-38</article-id><article-id custom-type="elpub" pub-id-type="custom">nguphys-403</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 ВЫСОКИХ ЭНЕРГИЙ, УСКОРИТЕЛЕЙ И ВЫСОКОТЕМПЕРАТУРНОЙ ПЛАЗМЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>HIGH-ENERGY AND ACCELERATOR PHYSICS, PHYSICS OF HIGH-TEMPERATURE PLASMA</subject></subj-group></article-categories><title-group><article-title>Распределение нейтрального газа в расширителе открытой ловушки</article-title><trans-title-group xml:lang="en"><trans-title>Distribution of Neutral Gas in the Expander of an Open Trap</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>Федоренков</surname><given-names>Э. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedorenkov</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Федоренков Эдуард Александрович, младший научный сотрудник</p><p>Новосибирск</p></bio><bio xml:lang="en"><p>Eduard A. Fedorenkov, Junior Researcher</p><p>Novosibirsk</p></bio><email xlink:type="simple">ed-f-a@mail.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>Беклемишев</surname><given-names>А. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Beklemishev</surname><given-names>A. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Беклемишев Алексей Дмитриевич, кандидат физико-математических наук, ведущий научный сотрудник</p><p>Новосибирск</p></bio><bio xml:lang="en"><p>Aleksey D. Beklemishev, Candidate of Physical and Mathematical Sciences, Leading Researcher</p><p>Novosibirsk</p></bio><email xlink:type="simple">bekl@bk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт ядерной физики им. Г. И. Будкера СО РАН;&#13;
Новосибирский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Budker Institute of Nuclear Physics of SB RAS;&#13;
Novosibirsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>23</day><month>10</month><year>2025</year></pub-date><volume>20</volume><issue>2</issue><fpage>19</fpage><lpage>38</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Федоренков Э.А., Беклемишев А.Д., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Федоренков Э.А., Беклемишев А.Д.</copyright-holder><copyright-holder xml:lang="en">Fedorenkov E.A., Beklemishev A.D.</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://nguphys.elpub.ru/jour/article/view/403">https://nguphys.elpub.ru/jour/article/view/403</self-uri><abstract><p>В открытой магнитной ловушке для удержания высокотемпературной плазмы ключевой проблемой являются продольные потери тепла, с которой борется расширитель плазменного потока. В предыдущих работах было показано, что нейтральный газ может снижать эффективность расширителя. В этой работе предложена модель, описывающая распределение нейтрального газа внутри плазмы и за ее пределами до стенок расширителя. Результаты показали, что концентрация газа вблизи и внутри плазмы на порядок меньше, чем вблизи стенок. Это указывает на менее строгие ограничения на предельную концентрацию нейтралов внутри плазмы.</p></abstract><trans-abstract xml:lang="en"><p>In an open magnetic trap for confining high-temperature plasma, the key problem is longitudinal heat loss, which is addressed by a plasma flow expander. Previous studies have shown that neutral gas can reduce the expander efficiency. In this paper, a model is proposed that describes the distribution of neutral gas inside the plasma and beyond it to the expander walls. The results show that the gas concentration near and inside the plasma is orders of magnitude lower than near the walls. This indicates less stringent restrictions on the maximum concentration of neutrals inside the plasma.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>открытые магнитные ловушки</kwd><kwd>физика расширителя</kwd><kwd>упругие столкновения</kwd><kwd>кинетическое уравнение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>open magnetic traps</kwd><kwd>expander physics</kwd><kwd>elastic collisions</kwd><kwd>kinetic equation</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">Sudnikov A., Soldatkina E. Review of recent advances and new ideas in development of the open magnetic traps // AIP Conference Proceedings. AIP Publishing, 2019. Vol. 2179. № 1.</mixed-citation><mixed-citation xml:lang="en">Sudnikov A., Soldatkina E. Review of recent advances and new ideas in development of the open magnetic traps AIP Conference Proceedings. 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