Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatially-dependent modeling and simulation of runaway electron
  mitigation in DIII-D   New simulations with the Kinetic Orbit Runaway electron (RE) Code KORC show
RE deconfinement losses to the wall during plasma scrape off are the primary
current dissipation mechanism in DIII-D experiments with high-Z impurity
injection, and not collisional slowing down. The majority of simulations also
exhibit an increase in the RE beam energy due to acceleration by the induced
toroidal electric field, even while the RE beam current is decreasing. In this
study, KORC integrates RE orbits using the relativistic guiding center
equations of motion, and incorporates time-sequenced, experimental
reconstructions of the magnetic and electric fields and line integrated
electron density to construct spatiotemporal models of electron and
partially-ionized impurity transport in the companion plasma. Comparisons of
experimental current evolution and KORC results demonstrate the importance of
including Coulomb collisions with partially-ionized impurity physics, initial
RE energy, pitch angle, and spatial distributions, and spatiotemporal electron
and partially-ionized impurity transport. This research provides an initial
quantification of the efficacy of RE mitigation via injected impurities, and
identification of the critical role played by loss of confinement due to plasma
scrape off on the inner wall as compared to the relatively slow collisional
damping.

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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th