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

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

doi:10.1063/5.0003299

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

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

Advanced Tokamak Physics

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

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 (D 2 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 the 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.

Original language	English
Article number	042515
Journal	Physics of Plasmas
Volume	27
Issue number	4
DOIs	https://doi.org/10.1063/5.0003299
State	Published - Apr 1 2020

Funding

This work was supported in part by the U.S. Department of Energy under Nos. DE-FG02-07ER54917, DE-FC02-04ER54698, DE-AC05-00OR22725, DE-AC52-07NA27344, DE-FG02-04ER54744, and DE-AC05-06OR23100. Technical support of L. Chousal, J. Kulchar, and D. Ayala is gratefully acknowledged, as is diagnostic support of M. Austin, C. Lasnier, A. Moser, and M. Van Zeeland. The originating developer of ADAS is the JET Joint Undertaking. Permission from H. A. Scott to use CRETIN is gratefully acknowledged.

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U.S. Department of Energy

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Hollmann, E. M., Bykov, I., Eidietis, N. W., Herfindal, J. L., Lvovskiy, A., Moyer, R. A., Parks, P. B., Paz-Soldan, C., Pigarov, A. Y., Rudakov, D. L., Shiraki, D., & Watkins, J. (2020). Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D. Physics of Plasmas, 27(4), Article 042515. https://doi.org/10.1063/5.0003299

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

abstract = "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 (D 2 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 the 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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AU - Hollmann, E. M.

AU - Bykov, I.

AU - Eidietis, N. W.

AU - Herfindal, J. L.

AU - Lvovskiy, A.

AU - Moyer, R. A.

AU - Parks, P. B.

AU - Paz-Soldan, C.

AU - Pigarov, A. Yu

AU - Rudakov, D. L.

AU - Shiraki, D.

AU - Watkins, J.

PY - 2020/4/1

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N2 - 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 (D 2 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 the 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.

AB - 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 (D 2 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 the 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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Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D

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