Overview of Large Helical Device experiments of basic plasma physics for solving crucial issues in reaching burning plasma conditions

LHD Experiment Group; the W7-X Team

doi:10.1088/1741-4326/ad3a7a

Overview of Large Helical Device experiments of basic plasma physics for solving crucial issues in reaching burning plasma conditions

LHD Experiment Group, the W7-X Team

Plasma Theory and Modeling

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7 Scopus citations

Abstract

Recently, experiments on basic plasma physics issues for solving future problems in fusion energy have been performed on a Large Helical Device. There are several problems to be solved in future devices for fusion energy. Emerging issues in burning plasma are: alpha-channeling (ion heating by alpha particles), turbulence and transport in electron dominant heating helium ash exhaust, reduction of the divertor heat load. To solve these problems, understanding the basic plasma physics of (1) wave-particle interaction through (inverse) Landau damping, (2) characteristics of electron-scale (high-k) turbulence, (3) ion mixing and the isotope effect, and (4) turbulence spreading and detachment, is necessary. This overview discusses the experimental studies on these issues and turbulent transport in multi-ion plasma and other issues in the appendix.

Original language	English
Article number	112009
Journal	Nuclear Fusion
Volume	64
Issue number	11
DOIs	https://doi.org/10.1088/1741-4326/ad3a7a
State	Published - Nov 1 2024

Funding

The author wishes to give thanks for the strong support from the Large Helical Device (LHD) operation team for their continuous efforts to maintain a safe and steady operation of the LHD. This work is supported by Grants-in-Aid for Scientific Research (JP19H01878, JP20K03896, JP21K13901, JP21H04973, JP21J14260, JP21K13901) of the Japan Society for the Promotion of Science. The datasets generated during and/or analyzed during the current study are available in the LHD data repository server of the National Institute for Fusion Science at https://doi.org/10.57451/lhd.analyzed-data. Part of this work is supported by the US Department of Energy under Contract No. DE-AC02-09CH11466 with Princeton University. Part of this work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200\u2014EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.

Keywords

Large Helical Device
basic plasma physics
burning plasma
ion mixing
turbulence spreading
wave-particle interaction

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10.1088/1741-4326/ad3a7a

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title = "Overview of Large Helical Device experiments of basic plasma physics for solving crucial issues in reaching burning plasma conditions",

abstract = "Recently, experiments on basic plasma physics issues for solving future problems in fusion energy have been performed on a Large Helical Device. There are several problems to be solved in future devices for fusion energy. Emerging issues in burning plasma are: alpha-channeling (ion heating by alpha particles), turbulence and transport in electron dominant heating helium ash exhaust, reduction of the divertor heat load. To solve these problems, understanding the basic plasma physics of (1) wave-particle interaction through (inverse) Landau damping, (2) characteristics of electron-scale (high-k) turbulence, (3) ion mixing and the isotope effect, and (4) turbulence spreading and detachment, is necessary. This overview discusses the experimental studies on these issues and turbulent transport in multi-ion plasma and other issues in the appendix.",

keywords = "Large Helical Device, basic plasma physics, burning plasma, ion mixing, turbulence spreading, wave-particle interaction",

author = "\{LHD Experiment Group\} and \{the W7-X Team\} and K. Ida and M. Yoshinuma and M. Kobayashi and T. Kobayashi and N. Kenmochi and F. Nespoli and Magee, \{R. M.\} and F. Warmer and A. Dinklage and A. Matsuyama and R. Sakamoto and T. Nasu and T. Tokuzawa and T. Kinoshita and K. Tanaka and N. Tamura and K. Nagaoka and M. Nishiura and Y. Takemura and K. Ogawa and G. Motojima and T. Oishi and Y. Morishita and J. Varela and Hayashi, \{W. H.J.\} and M. Markl and H. Bouvain and Y. Liang and M. Leconte and D. Moseev and Moiseenko, \{V. E.\} and Albert, \{C. G.\} and I. Allfrey and A. Alonso and Arellano, \{F. J.\} and N. Ashikawa and A. Azegami and L. Bardoczi and \{van Berkel\}, M. and M. Beurskens and Binderbaue, \{M. W.\} and A. Bortolon and S. Brezinsek and R. Bussiahn and A. Cappa and D. Carralero and Chan, \{I. C.\} and J. Cheng and Y. Ghai and Spong, \{D. A.\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s). Published by IOP Publishing Ltd on behalf of the IAEA.",

year = "2024",

month = nov,

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doi = "10.1088/1741-4326/ad3a7a",

language = "English",

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journal = "Nuclear Fusion",

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AU - Kobayashi, M.

AU - Kobayashi, T.

AU - Kenmochi, N.

AU - Nespoli, F.

AU - Magee, R. M.

AU - Warmer, F.

AU - Dinklage, A.

AU - Matsuyama, A.

AU - Sakamoto, R.

AU - Nasu, T.

AU - Tokuzawa, T.

AU - Kinoshita, T.

AU - Tanaka, K.

AU - Tamura, N.

AU - Nagaoka, K.

AU - Nishiura, M.

AU - Takemura, Y.

AU - Ogawa, K.

AU - Motojima, G.

AU - Oishi, T.

AU - Morishita, Y.

AU - Varela, J.

AU - Hayashi, W. H.J.

AU - Markl, M.

AU - Bouvain, H.

AU - Liang, Y.

AU - Leconte, M.

AU - Moseev, D.

AU - Moiseenko, V. E.

AU - Albert, C. G.

AU - Allfrey, I.

AU - Alonso, A.

AU - Arellano, F. J.

AU - Ashikawa, N.

AU - Azegami, A.

AU - Bardoczi, L.

AU - van Berkel, M.

AU - Beurskens, M.

AU - Binderbaue, M. W.

AU - Bortolon, A.

AU - Brezinsek, S.

AU - Bussiahn, R.

AU - Cappa, A.

AU - Carralero, D.

AU - Chan, I. C.

AU - Cheng, J.

AU - Ghai, Y.

AU - Spong, D. A.

PY - 2024/11/1

Y1 - 2024/11/1

N2 - Recently, experiments on basic plasma physics issues for solving future problems in fusion energy have been performed on a Large Helical Device. There are several problems to be solved in future devices for fusion energy. Emerging issues in burning plasma are: alpha-channeling (ion heating by alpha particles), turbulence and transport in electron dominant heating helium ash exhaust, reduction of the divertor heat load. To solve these problems, understanding the basic plasma physics of (1) wave-particle interaction through (inverse) Landau damping, (2) characteristics of electron-scale (high-k) turbulence, (3) ion mixing and the isotope effect, and (4) turbulence spreading and detachment, is necessary. This overview discusses the experimental studies on these issues and turbulent transport in multi-ion plasma and other issues in the appendix.

AB - Recently, experiments on basic plasma physics issues for solving future problems in fusion energy have been performed on a Large Helical Device. There are several problems to be solved in future devices for fusion energy. Emerging issues in burning plasma are: alpha-channeling (ion heating by alpha particles), turbulence and transport in electron dominant heating helium ash exhaust, reduction of the divertor heat load. To solve these problems, understanding the basic plasma physics of (1) wave-particle interaction through (inverse) Landau damping, (2) characteristics of electron-scale (high-k) turbulence, (3) ion mixing and the isotope effect, and (4) turbulence spreading and detachment, is necessary. This overview discusses the experimental studies on these issues and turbulent transport in multi-ion plasma and other issues in the appendix.

KW - Large Helical Device

KW - basic plasma physics

KW - burning plasma

KW - ion mixing

KW - turbulence spreading

KW - wave-particle interaction

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DO - 10.1088/1741-4326/ad3a7a

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AN - SCOPUS:85203132046

SN - 0029-5515

VL - 64

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 11

M1 - 112009

ER -

Overview of Large Helical Device experiments of basic plasma physics for solving crucial issues in reaching burning plasma conditions

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