Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator

U. Neuner; K. Rahbarnia; C. D. Beidler; A. Dinklage; Y. Turkin; T. Stange; T. Andreeva; J. Schilling; H. Thomsen; M. Beurskens; S. Bozhenkov; K. J. Brunner; H. Damm; G. Fuchert; J. Geiger; U. Hergenhahn; U. Höfel; J. Knauer; M. Krychowiak; S. Kwak; A. Langenberg; N. Pablant; E. Pasch; A. Pavone; E. R. Scott; J. Svensson; H. Trimino Mora

doi:10.1088/1741-4326/abd61a

Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator

U. Neuner
, K. Rahbarnia
, C. D. Beidler
, A. Dinklage
, Y. Turkin
, T. Stange
, T. Andreeva
, J. Schilling
, H. Thomsen
, M. Beurskens
, S. Bozhenkov
, K. J. Brunner
, H. Damm
, G. Fuchert
, J. Geiger
, U. Hergenhahn
, U. Höfel
, J. Knauer
, M. Krychowiak
, S. Kwak

A. Langenberg, N. Pablant, E. Pasch, A. Pavone, E. R. Scott, J. Svensson, H. Trimino Mora

PPPL Advanced Projects

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

18 Scopus citations

Abstract

Intrinsic, diffusion-driven toroidal (bootstrap) currents between -7 and 17 kA were measured in the optimised stellarator Wendelstein 7-X (W7-X) for several magnetic configurations at line-integrated plasma densities between 2 1019 and 1.6 1020 m-2 and heating powers between 0.5 and 6 MW. The sign of the bootstrap current changes with field reversal, and its magnitude decreases with the mirror term and the rotational transform of the magnetic configuration as well as the line-integrated plasma density, and increases with the heating power. Both the absolute values and the dependencies agree with neoclassical calculations within their respective uncertainties, confirming the neoclassical optimisation of W7-X for small bootstrap currents.

Original language	English (US)
Article number	036024
Journal	Nuclear Fusion
Volume	61
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/abd61a
State	Published - Mar 2021

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

Keywords

bootstrap current
neoclassical effect
stellarator

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10.1088/1741-4326/abd61a

Cite this

Neuner, U., Rahbarnia, K., Beidler, C. D., Dinklage, A., Turkin, Y., Stange, T., Andreeva, T., Schilling, J., Thomsen, H., Beurskens, M., Bozhenkov, S., Brunner, K. J., Damm, H., Fuchert, G., Geiger, J., Hergenhahn, U., Höfel, U., Knauer, J., Krychowiak, M., ... Mora, H. T. (2021). Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator. Nuclear Fusion, 61(3), Article 036024. https://doi.org/10.1088/1741-4326/abd61a

@article{0c97d0361d2745e28583481cdce63773,

title = "Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator",

abstract = "Intrinsic, diffusion-driven toroidal (bootstrap) currents between -7 and 17 kA were measured in the optimised stellarator Wendelstein 7-X (W7-X) for several magnetic configurations at line-integrated plasma densities between 2 1019 and 1.6 1020 m-2 and heating powers between 0.5 and 6 MW. The sign of the bootstrap current changes with field reversal, and its magnitude decreases with the mirror term and the rotational transform of the magnetic configuration as well as the line-integrated plasma density, and increases with the heating power. Both the absolute values and the dependencies agree with neoclassical calculations within their respective uncertainties, confirming the neoclassical optimisation of W7-X for small bootstrap currents.",

keywords = "bootstrap current, neoclassical effect, stellarator",

author = "U. Neuner and K. Rahbarnia and Beidler, \{C. D.\} and A. Dinklage and Y. Turkin and T. Stange and T. Andreeva and J. Schilling and H. Thomsen and M. Beurskens and S. Bozhenkov and Brunner, \{K. J.\} and H. Damm and G. Fuchert and J. Geiger and U. Hergenhahn and U. H{\"o}fel and J. Knauer and M. Krychowiak and S. Kwak and A. Langenberg and N. Pablant and E. Pasch and A. Pavone and Scott, \{E. R.\} and J. Svensson and Mora, \{H. Trimino\}",

note = "Publisher Copyright: {\textcopyright} EURATOM 2021.",

year = "2021",

month = mar,

doi = "10.1088/1741-4326/abd61a",

language = "English (US)",

volume = "61",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "3",

}

Neuner, U, Rahbarnia, K, Beidler, CD, Dinklage, A, Turkin, Y, Stange, T, Andreeva, T, Schilling, J, Thomsen, H, Beurskens, M, Bozhenkov, S, Brunner, KJ, Damm, H, Fuchert, G, Geiger, J, Hergenhahn, U, Höfel, U, Knauer, J, Krychowiak, M, Kwak, S, Langenberg, A, Pablant, N, Pasch, E, Pavone, A, Scott, ER, Svensson, J & Mora, HT 2021, 'Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator', Nuclear Fusion, vol. 61, no. 3, 036024. https://doi.org/10.1088/1741-4326/abd61a

TY - JOUR

T1 - Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator

AU - Neuner, U.

AU - Rahbarnia, K.

AU - Beidler, C. D.

AU - Dinklage, A.

AU - Turkin, Y.

AU - Stange, T.

AU - Andreeva, T.

AU - Schilling, J.

AU - Thomsen, H.

AU - Beurskens, M.

AU - Bozhenkov, S.

AU - Brunner, K. J.

AU - Damm, H.

AU - Fuchert, G.

AU - Geiger, J.

AU - Hergenhahn, U.

AU - Höfel, U.

AU - Knauer, J.

AU - Krychowiak, M.

AU - Kwak, S.

AU - Langenberg, A.

AU - Pablant, N.

AU - Pasch, E.

AU - Pavone, A.

AU - Scott, E. R.

AU - Svensson, J.

AU - Mora, H. Trimino

PY - 2021/3

Y1 - 2021/3

N2 - Intrinsic, diffusion-driven toroidal (bootstrap) currents between -7 and 17 kA were measured in the optimised stellarator Wendelstein 7-X (W7-X) for several magnetic configurations at line-integrated plasma densities between 2 1019 and 1.6 1020 m-2 and heating powers between 0.5 and 6 MW. The sign of the bootstrap current changes with field reversal, and its magnitude decreases with the mirror term and the rotational transform of the magnetic configuration as well as the line-integrated plasma density, and increases with the heating power. Both the absolute values and the dependencies agree with neoclassical calculations within their respective uncertainties, confirming the neoclassical optimisation of W7-X for small bootstrap currents.

AB - Intrinsic, diffusion-driven toroidal (bootstrap) currents between -7 and 17 kA were measured in the optimised stellarator Wendelstein 7-X (W7-X) for several magnetic configurations at line-integrated plasma densities between 2 1019 and 1.6 1020 m-2 and heating powers between 0.5 and 6 MW. The sign of the bootstrap current changes with field reversal, and its magnitude decreases with the mirror term and the rotational transform of the magnetic configuration as well as the line-integrated plasma density, and increases with the heating power. Both the absolute values and the dependencies agree with neoclassical calculations within their respective uncertainties, confirming the neoclassical optimisation of W7-X for small bootstrap currents.

KW - bootstrap current

KW - neoclassical effect

KW - stellarator

UR - https://www.scopus.com/pages/publications/85101877098

UR - https://www.scopus.com/pages/publications/85101877098#tab=citedBy

U2 - 10.1088/1741-4326/abd61a

DO - 10.1088/1741-4326/abd61a

M3 - Article

AN - SCOPUS:85101877098

SN - 0029-5515

VL - 61

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

M1 - 036024

ER -

Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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