Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D

Hollmann, Eric M.; Bykov, Igor; Eidietis, N. W.; Herfindal, J. L.; Lvovskiy, A.; Moyer, R. A.; Parks, P. B.; Paz-Soldan, C.; Pigarov, A. Yu.; Rudakov, D. L.; Shiraki, D.; Watkins, J.

doi:10.1063/5.0003299

Title: Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D

Journal Article · 20 April 2020 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0003299 · OSTI ID:1631980

^[1]; Bykov, Igor ^[1]; Eidietis, N. W. ^[2];

^[3];

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^[2]; Pigarov, A. Yu. ^[4]; Rudakov, D. L. ^[1];

^[3]; Watkins, J. ^[5]

Univ. of California, San Diego, CA (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
CompX Corp., Del Mar, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Herein, a 1D radial diffusion model is developed to study the observed rapid expulsion of argon from the runaway electron plateau in the DIII-D tokamak following secondary massive low-Z (D₂ or He) gas injection. The expulsion of argon is found to be caused by further cooling of the background plasma due to the added neutrals, accompanied by recombination of argon ions and greatly increased outward radial transport rate of argon (now dominantly in neutral form) out of the runaway electron beam. After argon expulsion, power loss out of the runaway electron plateau is found to be dominated by neutral transport to the wall (rather than by radiation); this result resolves the power balance discrepancy highlighted in previous work on argon expulsion out of the runaway electron plateau.

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Research Organization:: General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; FG02-07ER54917; AC05-00OR22725; AC52-07NA27344; FG02-04ER54744; AC05-06OR23100

OSTI ID:: 1631980

Alternate ID(s):: OSTI ID: 1615413; OSTI ID: 1657911

Journal Information:: Physics of Plasmas, Vol. 27, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (21)

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