First observation of plasma healing via helical equilibrium in tokamak disruptions

X. D. Du; M. W. Shafer; T. E. Evans; N. W. Eidietis; C. Paz-Soldan; D. A. Humphreys; E. J. Strait; D. Shiraki; M. E. Austin; Q. M. Hu; N. C. Logan; J. L. Barr; M. A. Van Zeeland; S. Ohdachi; Y. Suzuki

doi:10.1088/1741-4326/ab30bf

First observation of plasma healing via helical equilibrium in tokamak disruptions

X. D. Du, M. W. Shafer, T. E. Evans, N. W. Eidietis, C. Paz-Soldan, D. A. Humphreys, E. J. Strait, D. Shiraki, M. E. Austin, Q. M. Hu, N. C. Logan, J. L. Barr, M. A. Van Zeeland, S. Ohdachi, Y. Suzuki

Advanced Tokamak Physics

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

5 Scopus citations

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. On the other hand, 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. This observation implies prompt stochastic fields healing through the rapid non-linear growth of a magnetic island in the plasma core may provide a plausible path for a soft-landing scenario of tokamak disruption in a high plasma current regime.

Original language	English
Article number	094002
Journal	Nuclear Fusion
Volume	59
Issue number	9
DOIs	https://doi.org/10.1088/1741-4326/ab30bf
State	Published - Jul 26 2019

Keywords

3D fields
MHD instability
plasma disruption

Access to Document

10.1088/1741-4326/ab30bf

Cite this

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. (2019). First observation of plasma healing via helical equilibrium in tokamak disruptions. Nuclear Fusion, 59(9), Article 094002. https://doi.org/10.1088/1741-4326/ab30bf

@article{e1f013711eb14d599d1b173013e8b499,

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. On the other hand, 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. This observation implies prompt stochastic fields healing through the rapid non-linear growth of a magnetic island in the plasma core may provide a plausible path for a soft-landing scenario of tokamak disruption in a high plasma current regime.",

keywords = "3D fields, MHD instability, plasma disruption",

author = "Du, {X. D.} and Shafer, {M. W.} and Evans, {T. E.} and Eidietis, {N. W.} and C. Paz-Soldan and Humphreys, {D. A.} and Strait, {E. J.} and D. Shiraki and Austin, {M. E.} and Hu, {Q. M.} and Logan, {N. C.} and Barr, {J. L.} and {Van Zeeland}, {M. A.} and S. Ohdachi and Y. Suzuki",

note = "Publisher Copyright: {\textcopyright} 2019 IAEA, Vienna.",

year = "2019",

month = jul,

day = "26",

doi = "10.1088/1741-4326/ab30bf",

language = "English",

volume = "59",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "9",

}

TY - JOUR

T1 - First observation of plasma healing via helical equilibrium in tokamak disruptions

AU - Du, X. D.

AU - Shafer, M. W.

AU - Evans, T. E.

AU - Eidietis, N. W.

AU - Paz-Soldan, C.

AU - Humphreys, D. A.

AU - Strait, E. J.

AU - Shiraki, D.

AU - Austin, M. E.

AU - Hu, Q. M.

AU - Logan, N. C.

AU - Barr, J. L.

AU - Van Zeeland, M. A.

AU - Ohdachi, S.

AU - Suzuki, Y.

PY - 2019/7/26

Y1 - 2019/7/26

N2 - 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. On the other hand, 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. This observation implies prompt stochastic fields healing through the rapid non-linear growth of a magnetic island in the plasma core may provide a plausible path for a soft-landing scenario of tokamak disruption in a high plasma current regime.

AB - 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. On the other hand, 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. This observation implies prompt stochastic fields healing through the rapid non-linear growth of a magnetic island in the plasma core may provide a plausible path for a soft-landing scenario of tokamak disruption in a high plasma current regime.

KW - 3D fields

KW - MHD instability

KW - plasma disruption

UR - http://www.scopus.com/inward/record.url?scp=85072071835&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/ab30bf

DO - 10.1088/1741-4326/ab30bf

M3 - Article

AN - SCOPUS:85072071835

SN - 0029-5515

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

M1 - 094002

ER -

First observation of plasma healing via helical equilibrium in tokamak disruptions

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this