2019
DOI: 10.1088/1741-4326/ab32b2
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Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

Abstract: The assimilation of argon injected into post-disruption runaway electron (RE) plateaus is studied and compared to the vertical loss rate for vertically unstable RE plateaus. A 1D diffusion model is developed to include neutral diffusion and ionization and is used to help in data interpretation. It is found that the radial mixing time scale of argon ions (~0.05 s) is comparable to the vertical loss timescale. Neutral argon becomes the dominant Ar species in the RE plateau for large Ar numbers (> 3 × 10 21 ); at… Show more

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Cited by 19 publications
(21 citation statements)
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“…This choice of impurity composition is roughly in line with results presented in Ref. [31]. We will further discuss the calculation of impurity charge state densities and the affect of the assumed charge state ratio in Sec.…”
Section: B Plasma Modelsupporting
confidence: 82%
See 1 more Smart Citation
“…This choice of impurity composition is roughly in line with results presented in Ref. [31]. We will further discuss the calculation of impurity charge state densities and the affect of the assumed charge state ratio in Sec.…”
Section: B Plasma Modelsupporting
confidence: 82%
“…Ref. [31] recently developed a 1D diffusion model for impurity profiles and evolution. The present study builds on previous research by incorporating experimentally-reconstructed, time-dependent magnetic and electric fields and employing models for the spatial-dependence of the injected impurity and electron density.…”
Section: Introductionmentioning
confidence: 99%
“…This Letter provides CR modeling taking into account both the thermal bulk and the runaways with enhanced excitation and ionization scattering processes, which allows us to not only elucidate the new qualitative trends enabled by the coupling between the minority runaways and bulk thermal population through high-atomic-number ions, but also quantify the discrepancies between a full CR treatment and a decoupled treatment of thermal bulk and minority runaways, which has been the state of the art in runaway modeling. Supplementary material [22], contrasts the inclusion of both excitation and ionization collision with a recent analysis in the context of impurity transport that models the ionization balance using the Bethe stopping power formula for the runaway ionization rate [23].…”
mentioning
confidence: 99%
“…[6]), the predicted resistivity of the beam is found by the kinetic model to be 60-70 µΩ, which is consistent with observation. The better than usual match to experimental resistivity (well predicted collisional dissipation rate) may be due to the absence of high-energy REs and thus an absence of drift-orbit loss, which was recently invoked to explain discrepancies in the observed dissipation rates on DIII-D [62].…”
Section: Full Conversion Regimementioning
confidence: 87%