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Toroidal modeling of runaway electron loss due to 3-D fields in DIII-D and COMPASS

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    SYSNO ASEP0538142
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleToroidal modeling of runaway electron loss due to 3-D fields in DIII-D and COMPASS
    Author(s) Liu, Y. (US)
    Paz-Soldan, C. (US)
    Macúšová, Eva (UFP-V) ORCID
    Markovič, Tomáš (UFP-V) RID
    Ficker, Ondřej (UFP-V) ORCID
    Parks, P. B. (US)
    Kim, C. C. (US)
    Lao, L. (US)
    Li, Li. (CN)
    Number of authors9
    Article number102507
    Source TitlePhysics of Plasmas - ISSN 1070-664X
    Roč. 27, č. 10 (2020)
    Number of pages19 s.
    Languageeng - English
    CountryUS - United States
    KeywordsCOMPASS ; runaway electrons ; toroidal modeling
    Subject RIVBL - Plasma and Gas Discharge Physics
    OECD categoryFluids and plasma physics (including surface physics)
    R&D ProjectsGA18-02482S GA ČR - Czech Science Foundation (CSF)
    LM2015045 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    EF16_019/0000768 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    8D15001 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    LM2018117 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Method of publishingLimited access
    Institutional supportUFP-V - RVO:61389021
    UT WOS000582511200003
    EID SCOPUS85092727738
    DOI10.1063/5.0021154
    AnnotationThe 3-D field induced relativistic runaway electron (RE) loss has been simulated for DIII-D and COMPASS plasmas, utilizing the MARS-F code incorporated with the recently developed and updated RE orbit module (REORBIT). Modeling shows effectively 100% loss of a post-disruption, high-current runaway beam in DIII-D due to the 1 kG level of magnetic field perturbation produced by a fast growing n = 1 resistive kink instability. This complete RE loss is shown to be independent of the particle energy or the initial location of particles in the configuration space. Applied resonant magnetic perturbation (RMP) fields from in-vessel coils are not effective for RE beam mitigation in DIII-D but do produce finite (>10%) RE loss in COMPASS post-disruption plasmas, consistent with experimental observations in the above two devices. The major reasons for this difference in RE control by RMP between these two devices are (i) the coil proximity to the RE beam and (ii) the effective coil current scaling vs the machine size and the toroidal magnetic field. In the modeling, the lost REs due to 3-D fields deposit onto the limiting surfaces of the devices. Distributions of the lost REs to the limiting surface show a poloidally peaked profile near the high-field-side in both DIII-D and COMPASS, covering about 100 ° poloidal angle. A higher perturbation field level and/or higher particle energy also result in REs being lost to the low-field-side of the limiting surface of these two devices, increasing the effective wetted area.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Year of Publishing2021
    Electronic addresshttps://aip.scitation.org/doi/10.1063/5.0021154
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