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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8292</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Fast Global Tracking for the CBM Experiment at FAIR</article-title><trans-title-group xml:lang="ru"><trans-title>Быстрый алгоритм глобальной реконструкции треков для эксперимента CBM на ускорителе FAIR</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lebedev</surname><given-names>A Aleksandrovich</given-names></name><name xml:lang="ru"><surname>Лебедев</surname><given-names>Андрей Александрович</given-names></name></name-alternatives><bio xml:lang="en"> ; Joint Institute for Nuclear Research</bio><bio xml:lang="ru">Лаборатория информационных технологий; Объединённый институт ядерных исследований</bio><email>andrey.lebedev@gsi.de</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Hohne</surname><given-names>C</given-names></name><name xml:lang="ru"><surname>Хене</surname><given-names>Клавдия</given-names></name></name-alternatives><bio xml:lang="en">GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH</bio><bio xml:lang="ru">Центр имени Гельмгольца по исследованию тяжелых ионов</bio><email>c.hoehne@gsi.de</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kisel</surname><given-names>I Vasil'evich</given-names></name><name xml:lang="ru"><surname>Кисель</surname><given-names>Иван Васильевич</given-names></name></name-alternatives><bio xml:lang="en">GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH</bio><bio xml:lang="ru">Центр имени Гельмгольца по исследованию тяжелых ионов</bio><email>i.kisel@gsi.de</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ososkov</surname><given-names>G Alekseevich</given-names></name><name xml:lang="ru"><surname>Ососков</surname><given-names>Геннадий Алексеевич</given-names></name></name-alternatives><bio xml:lang="en"> ; Joint Institute for Nuclear Research</bio><bio xml:lang="ru">Лаборатория информационных технологий; Объединённый институт ядерных исследований</bio><email>ososkov@jinr.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Joint Institute for Nuclear Research</institution></aff><aff><institution xml:lang="ru">Объединённый институт ядерных исследований</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH</institution></aff><aff><institution xml:lang="ru">Центр имени Гельмгольца по исследованию тяжелых ионов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2010-02-02" publication-format="electronic"><day>02</day><month>02</month><year>2010</year></pub-date><issue>2.2</issue><issue-title xml:lang="en">NO2.2 (2010)</issue-title><issue-title xml:lang="ru">№2.2 (2010)</issue-title><fpage>59</fpage><lpage>63</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2010, Лебедев А.А., Хене К., Кисель И.В., Ососков Г.А.</copyright-statement><copyright-year>2010</copyright-year><copyright-holder xml:lang="ru">Лебедев А.А., Хене К., Кисель И.В., Ососков Г.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8292">https://journals.rudn.ru/miph/article/view/8292</self-uri><abstract xml:lang="en">Particle trajectory recognition is an important and challenging task in the Compressed Baryonic Matter (CBM) experiment at the future FAIR accelerator at Darmstadt. In this contribution, the status of the global track reconstruction software for the CBM experiment is presented. The global track reconstruction procedure is based on track following and Kalman Filter methods. The track reconstruction eﬃciency for central Au+Au collisions at 25 AGeV beam energy using events from the UrQMD model is at the level of 93-95%. Since CBM has to process terabytes of input data produced at high collision rates, it is extemly important to develop fast track reconstruction algorithms. Possibilities to speed up the algorithms have been studied. A signiﬁcant optimization of memory consumption and necessary combinatorics has been done. The usage of multithreading results in further acceleration. Overall, a factor 20 in speed could be achieved by these improvements.</abstract><trans-abstract xml:lang="ru">Реконструкция траекторий заряженных частиц - это важная и сложная задача в эксперименте CBM (Compressed Baryonic Matter) на будущем ускорителе FAIR в Дармштадте. В работе представлен текущий статус программного обеспечения по глобальной реконструкции треков в эксперименте CBM. Глобальная реконструкция треков основана на методах слежения по треку и фильтре Кальмана. Эффективность реконструкции треков для центральных столкновений золото-золото при энергии 25 ГэВ на нуклон, смоделированных с помощью UrQMD составляет 93-95%. В эксперименте CBM должны быть обработаны терабайты входных данных при высокой интенсивности соударений, следовательно, чрезвычайно важно разработать быстрые алгоритмы реконструкции треков. Исследованы возможности по ускорению алгоритмов. Значительно оптимизирована работа с памятью и комбинаторные вычисления. Использование многопоточности позволило ещё больше ускорить алгоритм. В целом достигнуто 20 кратное уменьшение времени просчёта.</trans-abstract><kwd-group xml:lang="en"><kwd>high energy physics</kwd><kwd>CBM experiment</kwd><kwd>track reconstruction</kwd><kwd>Kalman Filter</kwd><kwd>track fit</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>физика высоких энергий</kwd><kwd>эксперимент СВМ</kwd><kwd>восстановление треков</kwd><kwd>фильтр Кальмана</kwd><kwd>фитирование треков</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Collaboration C. Compressed Baryonic Matter Experiment. Technical Status Report: Techrep / GSI Darmstadt. - 2005.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>H¨ohne C., Rami F., Staszel P. The Compressed Baryonic Matter Experiment at FAIR // Nucl. Phys. News. - 2006. - Vol. 16, No 1. - Pp. 19-23.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Kisel I. Event Reconstruction in the CBM Experiment // Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - 2006. - Vol. 566. - Pp. 85-88.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Fruhwirth R. Application of Kalman Filtering to Track and Vertex Fitting // Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - 1987. - Vol. 262, No 2-3. - Pp. 444-450.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>The ROOT team. The ROOT Users Guide. - 2009. - ftp://root.cern.ch/ root/doc/Users_Guide_5_24.pdf.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Lebedev A., Ososkov G. LIT Track Propagation for CBM // CBM note. - 2008. - http://www.gsi.de/documents/DOC-2008-Dec-182-1.pdf.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Bass S. A. et al. Microscopic Models for Ultrarelativistic Heavy ion Collisions // Progress in Particle and Nuclear Physics. - 1998. - Vol. 41. - Pp. 225-369.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>GEANT - Detector Description and Simulation Tool CERN Program Library Long Writeup. - W5013.</mixed-citation></ref></ref-list></back></article>
