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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">npe</journal-id><journal-title-group><journal-title xml:lang="ru">Ядерная физика и инжиниринг</journal-title><trans-title-group xml:lang="en"><trans-title>Nuclear Physics and Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2079-5629</issn><issn pub-type="epub">2079-5637</issn><publisher><publisher-name>МИФИ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.56304/S2079562922010195</article-id><article-id custom-type="elpub" pub-id-type="custom">npe-14</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 газового разряда и плазмы</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Gas Discharge and Plasma Physics</subject></subj-group></article-categories><title-group><article-title>ФОТОЭМИССИЯ ПИКОСЕКУНДНЫХ ЭЛЕКТРОННЫХ СГУСТКОВ С БОЛЬШИМ ЗАРЯДОМ В ВЧ ПУШКАХ</article-title><trans-title-group xml:lang="en"><trans-title>Photoemission of Picosecond Electron Bunches with Large Charge in RF Guns</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>Красильников</surname><given-names>М.</given-names></name><name name-style="western" xml:lang="en"><surname>Krasilnikov</surname><given-names>М.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Полозов</surname><given-names>С. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Polozov</surname><given-names>S. М.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ращиков</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Rashchikov</surname><given-names>V. I.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>DESY, Hamburg, D-22607 Germany</institution><country>Германия</country></aff><aff xml:lang="en"><institution>DESY, Hamburg, D-22607 Germany</institution><country>Germany</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Национальный исследовательский ядерный университет “МИФИ”, Москва, 115409 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409 Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>14</day><month>10</month><year>2023</year></pub-date><volume>13</volume><issue>1</issue><fpage>73</fpage><lpage>78</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Красильников М., Полозов С.М., Ращиков В.И., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Красильников М., Полозов С.М., Ращиков В.И.</copyright-holder><copyright-holder xml:lang="en">Krasilnikov М., Polozov S.М., Rashchikov V.I.</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://npe.elpub.ru/jour/article/view/14">https://npe.elpub.ru/jour/article/view/14</self-uri><abstract><p>Рассматривается эмиссия коротких электронных сгустков с большим зарядом в высокочастотных пушках. При пикосекундных длительностях лазерного импульса и наличии сильного электрического поля на катоде, картина сильно отличается от традиционного механизма эмиссии, ограниченной пространственным зарядом вылетающих частиц. В этом случае необходимо учитывать влияние положительного заряда, динамически возникающего на поверхности катоде, связанного с разностью скоростей фотоэлектронов, покидающих полупроводниковую плeнку фотокатода, и скоростью электронов, поступающих в область эмиссии. Сравнение результатов расчетов с экспериментальными данными, полученными на установке для тестирования фотоинжекторов в PITZ (DESY, Zeuthen, Германия), показало хорошее согласие.</p></abstract><trans-abstract xml:lang="en"><p>Emission of short electron bunches with high charge in RF guns is considered. The emission mechanism in the case of picosecond laser pulses and the presence of a strong electric field at the cathode is quite different from the traditional one limited by the space charge of emitted particles. In this case, it is necessary to take into account the influence of positive charge dynamically formed on the cathode surface related to the difference of velocities of photoelectrons leaving the semiconductor film of the photocathode and velocities of electrons entering the emission region. The comparison of the numerical results and experimental data obtained at the facility for testing photoinjectors at PITZ (DESY, Zeuthen, Germany) demonstrated good agreement.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фотоэмиссии</kwd><kwd>ВЧ пушка</kwd><kwd>моделирование</kwd><kwd>ускорители заряженных частиц</kwd><kwd>интен- сивные пучки</kwd><kwd>пространственный заряд</kwd></kwd-group><kwd-group xml:lang="en"><kwd>photoemission</kwd><kwd>RF gun</kwd><kwd>simulation</kwd><kwd>charged particle accelerators</kwd><kwd>high intensity beams</kwd><kwd>space charge</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">&lt;em&gt;Chen Y. et al.&lt;/em&gt; // Nucl. Instrum. Methods Phys. Res., Sect. A. 2018. V. 889. P. 129.</mixed-citation><mixed-citation xml:lang="en">&lt;em&gt;Chen Y. et al.&lt;/em&gt; // Nucl. Instrum. Methods Phys. Res., Sect. A. 2018. V. 889. 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