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Title: 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 x 10 21); at the same time the neutral Ar diffusivity decreases due to plasma cooling, causing a saturation in the assimilation of injected Ar on the vertical loss time scale. Injection of Ar into vertically unstable RE plateaus in DIII-D does increase the vertical loss rate, as predicted by previous modeling of ITER. Furthermore, there is a decreasing trend in RE current at the wall strike as the Ar quantity is turned up or as the Ar is injected earlier, indicating a decrease in RE energy deposited to the wall.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [1]; ORCiD logo [3];  [4];  [2]; ORCiD logo [3]; ORCiD logo [1];  [2];  [2];  [5]; ORCiD logo [2];  [2];  [1]; ORCiD logo [2]; ORCiD logo [1];  [5]; ORCiD logo [3] more »; ORCiD logo [2];  [2]; ORCiD logo [3] « less
  1. Univ. of California-San Diego, La Jolla, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Texas at Austin, Austin, TX (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Dept. of Energy (DOE), Washington DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1558491
Alternate Identifier(s):
OSTI ID: 1569026
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 10; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Hollmann, E. M., Eidietis, N. W., Herfindal, Jeffrey L., Parks, P. B., Pigarov, A. Y., Shiraki, Daisuke, Austin, M. E., Bardoczi, L., Baylor, Larry, Bykov, Igor, Carlstrom, T. N., Kaplan, David, Lasnier, C. J., Lvovskiy, Andreas, Moser, Auna, Moyer, Richard A., Paz-Soldan, Carlos, Rudakov, D. L., Samuell, Cameron, Shafer, Morgan W., Van Zeeland, M., Welander, A., and Wilcox, Robert. Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab32b2.
Hollmann, E. M., Eidietis, N. W., Herfindal, Jeffrey L., Parks, P. B., Pigarov, A. Y., Shiraki, Daisuke, Austin, M. E., Bardoczi, L., Baylor, Larry, Bykov, Igor, Carlstrom, T. N., Kaplan, David, Lasnier, C. J., Lvovskiy, Andreas, Moser, Auna, Moyer, Richard A., Paz-Soldan, Carlos, Rudakov, D. L., Samuell, Cameron, Shafer, Morgan W., Van Zeeland, M., Welander, A., & Wilcox, Robert. Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model. United States. doi:10.1088/1741-4326/ab32b2.
Hollmann, E. M., Eidietis, N. W., Herfindal, Jeffrey L., Parks, P. B., Pigarov, A. Y., Shiraki, Daisuke, Austin, M. E., Bardoczi, L., Baylor, Larry, Bykov, Igor, Carlstrom, T. N., Kaplan, David, Lasnier, C. J., Lvovskiy, Andreas, Moser, Auna, Moyer, Richard A., Paz-Soldan, Carlos, Rudakov, D. L., Samuell, Cameron, Shafer, Morgan W., Van Zeeland, M., Welander, A., and Wilcox, Robert. Wed . "Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model". United States. doi:10.1088/1741-4326/ab32b2.
@article{osti_1558491,
title = {Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model},
author = {Hollmann, E. M. and Eidietis, N. W. and Herfindal, Jeffrey L. and Parks, P. B. and Pigarov, A. Y. and Shiraki, Daisuke and Austin, M. E. and Bardoczi, L. and Baylor, Larry and Bykov, Igor and Carlstrom, T. N. and Kaplan, David and Lasnier, C. J. and Lvovskiy, Andreas and Moser, Auna and Moyer, Richard A. and Paz-Soldan, Carlos and Rudakov, D. L. and Samuell, Cameron and Shafer, Morgan W. and Van Zeeland, M. and Welander, A. and Wilcox, Robert},
abstractNote = {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 x 1021); at the same time the neutral Ar diffusivity decreases due to plasma cooling, causing a saturation in the assimilation of injected Ar on the vertical loss time scale. Injection of Ar into vertically unstable RE plateaus in DIII-D does increase the vertical loss rate, as predicted by previous modeling of ITER. Furthermore, there is a decreasing trend in RE current at the wall strike as the Ar quantity is turned up or as the Ar is injected earlier, indicating a decrease in RE energy deposited to the wall.},
doi = {10.1088/1741-4326/ab32b2},
journal = {Nuclear Fusion},
number = 10,
volume = 59,
place = {United States},
year = {2019},
month = {8}
}

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