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Title: First observation of plasma healing via helical equilibrium in tokamak disruptions

Abstract

A prompt transition of equilibrium states in a disruptive plasma is observed in the presence of three-dimensional (3D) resonant magnetic fields. A dominantly stochastic field line state heals into a 3D equilibrium with intact flux surfaces, resembling a single helicity magnetic island in the plasma core. As a consequence, the current quench process is bifurcated, i.e., from a completed quench accompanied by a vertically unstable disruption to a rapid termination of current decay followed by a full recovery to its predisruption value. Finally, this observation implies prompt stochastic fields healing through the rapid non-linear growth of magnetic island in plasma core may provide a plausible path for a soft-landing scenario of tokamak disruption in high plasma current regime.

Authors:
 [1];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1];  [5]; ORCiD logo [5]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Texas, Austin, TX (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  5. National Inst. for Fusion Science, Toki (Japan)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1577450
Grant/Contract Number:  
[FC02-04ER54698; AC05-00OR22725; AC02-09CH11466; SC0015878]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
[ Journal Volume: 59; Journal Issue: 9]; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Du, X. D., Shafer, M. W., Evans, T. E., Eidietis, N. W., Paz-Soldan, C., Humphreys, D. A., Strait, E. J., Shiraki, D., Austin, M. E., Hu, Q. M., Logan, N. C., Barr, J. L., Van Zeeland, M. A., Ohdachi, S., and Suzuki, Y. First observation of plasma healing via helical equilibrium in tokamak disruptions. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab30bf.
Du, X. D., Shafer, M. W., Evans, T. E., Eidietis, N. W., Paz-Soldan, C., Humphreys, D. A., Strait, E. J., Shiraki, D., Austin, M. E., Hu, Q. M., Logan, N. C., Barr, J. L., Van Zeeland, M. A., Ohdachi, S., & Suzuki, Y. First observation of plasma healing via helical equilibrium in tokamak disruptions. United States. doi:10.1088/1741-4326/ab30bf.
Du, X. D., Shafer, M. W., Evans, T. E., Eidietis, N. W., Paz-Soldan, C., Humphreys, D. A., Strait, E. J., Shiraki, D., Austin, M. E., Hu, Q. M., Logan, N. C., Barr, J. L., Van Zeeland, M. A., Ohdachi, S., and Suzuki, Y. Fri . "First observation of plasma healing via helical equilibrium in tokamak disruptions". United States. doi:10.1088/1741-4326/ab30bf.
@article{osti_1577450,
title = {First observation of plasma healing via helical equilibrium in tokamak disruptions},
author = {Du, X. D. and Shafer, M. W. and Evans, T. E. and Eidietis, N. W. and Paz-Soldan, C. and Humphreys, D. A. and Strait, E. J. and Shiraki, D. and Austin, M. E. and Hu, Q. M. and Logan, N. C. and Barr, J. L. and Van Zeeland, M. A. and Ohdachi, S. and Suzuki, Y.},
abstractNote = {A prompt transition of equilibrium states in a disruptive plasma is observed in the presence of three-dimensional (3D) resonant magnetic fields. A dominantly stochastic field line state heals into a 3D equilibrium with intact flux surfaces, resembling a single helicity magnetic island in the plasma core. As a consequence, the current quench process is bifurcated, i.e., from a completed quench accompanied by a vertically unstable disruption to a rapid termination of current decay followed by a full recovery to its predisruption value. Finally, this observation implies prompt stochastic fields healing through the rapid non-linear growth of magnetic island in plasma core may provide a plausible path for a soft-landing scenario of tokamak disruption in high plasma current regime.},
doi = {10.1088/1741-4326/ab30bf},
journal = {Nuclear Fusion},
number = [9],
volume = [59],
place = {United States},
year = {2019},
month = {7}
}

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