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

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    0538142 - ÚFP 2021 RIV US eng J - Článek v odborném periodiku
    Liu, Y. - Paz-Soldan, C. - Macúšová, Eva - Markovič, Tomáš - Ficker, Ondřej - Parks, P. B. - Kim, C. C. - Lao, L. - Li, Li.
    Toroidal modeling of runaway electron loss due to 3-D fields in DIII-D and COMPASS.
    Physics of Plasmas. Roč. 27, č. 10 (2020), č. článku 102507. ISSN 1070-664X. E-ISSN 1089-7674
    Grant CEP: GA ČR(CZ) GA18-02482S; GA MŠk(CZ) LM2015045; GA MŠk(CZ) EF16_019/0000768; GA MŠk(CZ) 8D15001; GA MŠk(CZ) LM2018117
    GRANT EU: European Commission(XE) 633053 - EUROfusion
    Institucionální podpora: RVO:61389021
    Klíčová slova: COMPASS * runaway electrons * toroidal modeling
    Obor OECD: Fluids and plasma physics (including surface physics)
    Impakt faktor: 2.023, rok: 2020
    Způsob publikování: Omezený přístup
    https://aip.scitation.org/doi/10.1063/5.0021154

    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.
    Trvalý link: http://hdl.handle.net/11104/0315963

     
     
Počet záznamů: 1