Confinement in Wendelstein 7-X limiter plasmas

W. X. Team; M. Hirsch; A. Dinklage; A. Alonso; G. Fuchert; S. Bozhenkov; U. Höfel; T. Andreeva; J. Baldzuhn; M. Beurskens; H. S. Bosch; C. D. Beidler; C. Biedermann; E. Blanco; R. Brakel; R. Burhenn; B. Buttenschön; A. Cappa; A. Czarnecka; M. Endler; T. Estrada; T. Fornal; J. Geiger; O. Grulke; J. H. Harris; D. Hartmann; M. Jakubowski; T. Klinger; J. Knauer; G. Kocsis; R. König; P. Kornejew; A. Krämer-Flecken; N. Krawczyk; M. Krychowiak; M. Kubkowska; I. Ksiazek; A. Langenberg; H. P. Laqua; S. Lazerson; H. Maaßberg; N. Marushchenko; S. Marsen; V. Moncada; D. Moseev; D. Naujoks; M. Otte; N. Pablant; E. Pasch; F. Pisano; K. Rahbarnia; T. Schröder; T. Stange; L. Stephey; T. Szepesi; T. Sunn Pedersen; H. Trimino Mora; H. Thomsen; H. Tsuchiya; Yu Turkin; T. Wauters; G. Weir; U. Wenzel; A. Werner; R. Wolf; G. A. Wurden; D. Zhang

doi:10.1088/1741-4326/aa7372

Confinement in Wendelstein 7-X limiter plasmas

W. X. Team, M. Hirsch, A. Dinklage, A. Alonso, G. Fuchert, S. Bozhenkov, U. Höfel, T. Andreeva, J. Baldzuhn, M. Beurskens, H. S. Bosch, C. D. Beidler, C. Biedermann, E. Blanco, R. Brakel, R. Burhenn, B. Buttenschön, A. Cappa, A. Czarnecka, M. EndlerT. Estrada, T. Fornal, J. Geiger, O. Grulke, J. H. Harris, D. Hartmann, M. Jakubowski, T. Klinger, J. Knauer, G. Kocsis, R. König, P. Kornejew, A. Krämer-Flecken, N. Krawczyk, M. Krychowiak, M. Kubkowska, I. Ksiazek, A. Langenberg, H. P. Laqua, S. Lazerson, H. Maaßberg, N. Marushchenko, S. Marsen, V. Moncada, D. Moseev, D. Naujoks, M. Otte, N. Pablant, E. Pasch, F. Pisano, K. Rahbarnia, T. Schröder, T. Stange, L. Stephey, T. Szepesi, T. Sunn Pedersen, H. Trimino Mora, H. Thomsen, H. Tsuchiya, Yu Turkin, T. Wauters, G. Weir, U. Wenzel, A. Werner, R. Wolf, G. A. Wurden, D. Zhang

Laboratory for Plasma Physics

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Abstract

Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities <2-3 • 10¹⁹ m^-3. With the available 4.3 MW ECR Heating core T _e ∼ 8 keV, T _i ∼ 1-2 keV are achieved routinely resulting in energy confinement time τ _E between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked T _e-profiles and positive E _r up to about half of the minor radius. Profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.

Original language	English
Article number	086010
Journal	Nuclear Fusion
Volume	57
Issue number	8
DOIs	https://doi.org/10.1088/1741-4326/aa7372
Publication status	Published - 14 Jun 2017

Keywords

confinement
energy confinement
stellarator

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10.1088/1741-4326/aa7372

Cite this

Team, W. X., Hirsch, M., Dinklage, A., Alonso, A., Fuchert, G., Bozhenkov, S., Höfel, U., Andreeva, T., Baldzuhn, J., Beurskens, M., Bosch, H. S., Beidler, C. D., Biedermann, C., Blanco, E., Brakel, R., Burhenn, R., Buttenschön, B., Cappa, A., Czarnecka, A., ... Zhang, D. (2017). Confinement in Wendelstein 7-X limiter plasmas. Nuclear Fusion, 57(8), Article 086010. https://doi.org/10.1088/1741-4326/aa7372

@article{c57831fbc27c4d6d825475aa99219b43,

title = "Confinement in Wendelstein 7-X limiter plasmas",

abstract = "Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities <2-3 • 1019 m-3. With the available 4.3 MW ECR Heating core T e ∼ 8 keV, T i ∼ 1-2 keV are achieved routinely resulting in energy confinement time τ E between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked T e-profiles and positive E r up to about half of the minor radius. Profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.",

keywords = "confinement, energy confinement, stellarator",

author = "Team, {W. X.} and M. Hirsch and A. Dinklage and A. Alonso and G. Fuchert and S. Bozhenkov and U. H{\"o}fel and T. Andreeva and J. Baldzuhn and M. Beurskens and Bosch, {H. S.} and Beidler, {C. D.} and C. Biedermann and E. Blanco and R. Brakel and R. Burhenn and B. Buttensch{\"o}n and A. Cappa and A. Czarnecka and M. Endler and T. Estrada and T. Fornal and J. Geiger and O. Grulke and Harris, {J. H.} and D. Hartmann and M. Jakubowski and T. Klinger and J. Knauer and G. Kocsis and R. K{\"o}nig and P. Kornejew and A. Kr{\"a}mer-Flecken and N. Krawczyk and M. Krychowiak and M. Kubkowska and I. Ksiazek and A. Langenberg and Laqua, {H. P.} and S. Lazerson and H. Maa{\ss}berg and N. Marushchenko and S. Marsen and V. Moncada and D. Moseev and D. Naujoks and M. Otte and N. Pablant and E. Pasch and F. Pisano and K. Rahbarnia and T. Schr{\"o}der and T. Stange and L. Stephey and T. Szepesi and {Sunn Pedersen}, T. and {Trimino Mora}, H. and H. Thomsen and H. Tsuchiya and Yu Turkin and T. Wauters and G. Weir and U. Wenzel and A. Werner and R. Wolf and Wurden, {G. A.} and D. Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 Max-Planck-Institut fuer Plasmaphysik.",

year = "2017",

month = jun,

day = "14",

doi = "10.1088/1741-4326/aa7372",

language = "English",

volume = "57",

journal = "Nuclear Fusion",

issn = "0029-5515",

number = "8",

}

Team, WX, Hirsch, M, Dinklage, A, Alonso, A, Fuchert, G, Bozhenkov, S, Höfel, U, Andreeva, T, Baldzuhn, J, Beurskens, M, Bosch, HS, Beidler, CD, Biedermann, C, Blanco, E, Brakel, R, Burhenn, R, Buttenschön, B, Cappa, A, Czarnecka, A, Endler, M, Estrada, T, Fornal, T, Geiger, J, Grulke, O, Harris, JH, Hartmann, D, Jakubowski, M, Klinger, T, Knauer, J, Kocsis, G, König, R, Kornejew, P, Krämer-Flecken, A, Krawczyk, N, Krychowiak, M, Kubkowska, M, Ksiazek, I, Langenberg, A, Laqua, HP, Lazerson, S, Maaßberg, H, Marushchenko, N, Marsen, S, Moncada, V, Moseev, D, Naujoks, D, Otte, M, Pablant, N, Pasch, E, Pisano, F, Rahbarnia, K, Schröder, T, Stange, T, Stephey, L, Szepesi, T, Sunn Pedersen, T, Trimino Mora, H, Thomsen, H, Tsuchiya, H, Turkin, Y, Wauters, T, Weir, G, Wenzel, U, Werner, A, Wolf, R, Wurden, GA & Zhang, D 2017, 'Confinement in Wendelstein 7-X limiter plasmas', Nuclear Fusion, vol. 57, no. 8, 086010. https://doi.org/10.1088/1741-4326/aa7372

TY - JOUR

T1 - Confinement in Wendelstein 7-X limiter plasmas

AU - Team, W. X.

AU - Hirsch, M.

AU - Dinklage, A.

AU - Alonso, A.

AU - Fuchert, G.

AU - Bozhenkov, S.

AU - Höfel, U.

AU - Andreeva, T.

AU - Baldzuhn, J.

AU - Beurskens, M.

AU - Bosch, H. S.

AU - Beidler, C. D.

AU - Biedermann, C.

AU - Blanco, E.

AU - Brakel, R.

AU - Burhenn, R.

AU - Buttenschön, B.

AU - Cappa, A.

AU - Czarnecka, A.

AU - Endler, M.

AU - Estrada, T.

AU - Fornal, T.

AU - Geiger, J.

AU - Grulke, O.

AU - Harris, J. H.

AU - Hartmann, D.

AU - Jakubowski, M.

AU - Klinger, T.

AU - Knauer, J.

AU - Kocsis, G.

AU - König, R.

AU - Kornejew, P.

AU - Krämer-Flecken, A.

AU - Krawczyk, N.

AU - Krychowiak, M.

AU - Kubkowska, M.

AU - Ksiazek, I.

AU - Langenberg, A.

AU - Laqua, H. P.

AU - Lazerson, S.

AU - Maaßberg, H.

AU - Marushchenko, N.

AU - Marsen, S.

AU - Moncada, V.

AU - Moseev, D.

AU - Naujoks, D.

AU - Otte, M.

AU - Pablant, N.

AU - Pasch, E.

AU - Pisano, F.

AU - Rahbarnia, K.

AU - Schröder, T.

AU - Stange, T.

AU - Stephey, L.

AU - Szepesi, T.

AU - Sunn Pedersen, T.

AU - Trimino Mora, H.

AU - Thomsen, H.

AU - Tsuchiya, H.

AU - Turkin, Yu

AU - Wauters, T.

AU - Weir, G.

AU - Wenzel, U.

AU - Werner, A.

AU - Wolf, R.

AU - Wurden, G. A.

AU - Zhang, D.

PY - 2017/6/14

Y1 - 2017/6/14

N2 - Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities <2-3 • 1019 m-3. With the available 4.3 MW ECR Heating core T e ∼ 8 keV, T i ∼ 1-2 keV are achieved routinely resulting in energy confinement time τ E between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked T e-profiles and positive E r up to about half of the minor radius. Profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.

AB - Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities <2-3 • 1019 m-3. With the available 4.3 MW ECR Heating core T e ∼ 8 keV, T i ∼ 1-2 keV are achieved routinely resulting in energy confinement time τ E between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked T e-profiles and positive E r up to about half of the minor radius. Profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.

KW - confinement

KW - energy confinement

KW - stellarator

UR - http://www.scopus.com/inward/record.url?scp=85026516651&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/aa7372

DO - 10.1088/1741-4326/aa7372

M3 - Article

AN - SCOPUS:85026516651

SN - 0029-5515

VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

M1 - 086010

ER -

Confinement in Wendelstein 7-X limiter plasmas

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Keywords

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