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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 ASEP 0538142 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Toroidal modeling of runaway electron loss due to 3-D fields in DIII-D and COMPASS Author(s) Liu, Y. (US)
Paz-Soldan, C. (US)
Tomešová, 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 authors 9 Article number 102507 Source Title Physics of Plasmas - ISSN 1070-664X
Roč. 27, č. 10 (2020)Number of pages 19 s. Language eng - English Country US - United States Keywords COMPASS ; runaway electrons ; toroidal modeling Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA18-02482S GA ČR - Czech Science Foundation (CSF) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2018117 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000582511200003 EID SCOPUS 85092727738 DOI 10.1063/5.0021154 Annotation The 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. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2021 Electronic address https://aip.scitation.org/doi/10.1063/5.0021154
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