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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F20%3A00538142" target="_blank" >RIV/61389021:_____/20:00538142 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/20:00347601 RIV/00216208:11320/20:10439903

Result on the web

<a href="https://aip.scitation.org/doi/10.1063/5.0021154" target="_blank" >https://aip.scitation.org/doi/10.1063/5.0021154</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0021154" target="_blank" >10.1063/5.0021154</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physics of Plasmas

ISSN

1070-664X

e-ISSN

—

Volume of the periodical

27

Issue of the periodical within the volume

10

Country of publishing house

US - UNITED STATES

Number of pages

19

Pages from-to

102507

UT code for WoS article

000582511200003

EID of the result in the Scopus database

2-s2.0-85092727738