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Implementation of dressed cross-section model into the BIT1 code
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SYSNO ASEP 0583705 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Implementation of dressed cross-section model into the BIT1 code Tvůrce(i) Tskhakaya, David (UFP-V) ORCID Celkový počet autorů 1 Číslo článku 135 Zdroj.dok. European Physical Journal D. - : Springer - ISSN 1434-6060
Roč. 77, č. 7 (2023)Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova BIT1 ; DCSM ; kinetic simulations Vědní obor RIV BE - Teoretická fyzika Obor OECD Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) CEP EF16_013/0001551 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA20-28161S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora UFP-V - RVO:61389021 UT WOS 001030559600004 EID SCOPUS 85165225951 DOI 10.1140/epjd/s10053-023-00682-w Anotace In the present work, we describe a new method, dressed cross-section model (DCSM), enabling implementation of large number of atomic transitions (~106 and more) in the kinetic simulations. The effective collision cross-sections derived from the DCSM show expected asymptotic behaviour: (i) For low plasma density, they reduce to the conventional cross-sections for single-step transitions from the ground state - (ii) the Maxwell-averaged rate coefficients are equal to the corresponding rate coefficients obtained from the Collisional-Radiative Model. We describe implementation of ionization and recombination DCSM into the PIC MC code BIT1 and present new results for tokamak plasma edge modelling. Graphical abstract: Realistic simulations of the plasma edge require precise treatment of plasma–impurity and plasma–neutral particle interactions. Full fluid, or fluid plasma—kinetic neutral models employ effective collision rates derived from the Collisional-Radiative Models (CRM) precalculated by different atomic data providers (e.g. see Summers and O’Mullane (AIP Conf. Proc. 1344:179, 2011)). These CRM incorporate large number of atomic states (103 and more) and corresponding transitions (~106), but assume Maxwellian energy distribution functions (EDF) for colliding particles. In order to describe processes in a non-Maxwellian plasma, kinetic models are applied. Such models operate with collision cross-sections and due to limited computing power of present-day computing facilities can simulate just a few dozens of interaction channels, see Tskhakaya (Plasma Phys Contr Fusion 59:114001, 2017), Mijin et al. (Comput Phys Commun 258:107600, 2021) and references there.[Figure not available: see fulltext.] The DCSM consists of two steps: calculation of averaged cross-sections for excitation collisions from the ground state and introduction of effective cross-sections based on CRM rate coefficients. The effective cross-sections derived from the DCSM show expected asymptotic behaviour: i. For low plasma density, they reduce to the direct transition cross-sections from the ground state - and ii. the Maxwell-averaged rate coefficients obtained from the DCSM are equal the corresponding CRM rate coefficients. We demonstrate application of the DCSM in simulations of the tokamak scrape-off layer. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2024 Elektronická adresa https://link.springer.com/article/10.1140/epjd/s10053-023-00682-w
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