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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 centerdot 1019 m-3. With the available 4.3 MW ECR Heating core Te ~ 8 keV, Ti ~ 1–2 keV are achieved routinely resulting in energy confinement time τE between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked Te-profiles and positive Er up to about half of the minor radius. Lastly, profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [2];  [3];  [1];  [2] more »;  [3];  [1];  [1];  [4];  [1];  [1];  [1];  [1];  [5];  [1];  [1];  [6];  [3];  [1];  [3];  [7];  [1];  [1];  [8];  [1];  [1];  [1];  [9];  [1];  [1];  [1];  [8];  [1];  [10];  [1];  [1];  [1];  [11];  [5];  [1];  [1];  [1];  [12];  [1];  [13];  [1];  [1];  [1];  [1]; ORCiD logo [14];  [1] « less
  1. Max Planck Inst. for Plasma Physics, Greifswald (Germany)
  2. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  3. Inst. of Plasma Physics and Laser Microfusion (IPPLM), Warsaw (Poland)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Hungarian Academy of Sciences, Budapest (Hungary). Wigner Inst.
  6. Forschungszentrum Julich (Germany)
  7. Opole Univ. (Poland)
  8. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  9. Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
  10. Univ. of Cagliari (Italy)
  11. Univ. of Wisconsin, Madison, WI (United States)
  12. National Inst. for Fusion Science (NIFS), Toki (Japan)
  13. Ecole Royale Militaire, Koninklijke Militaire School (ERM-KMS), Brussels (Belgium). Lab. for Plasma Physics
  14. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24); European Union (EU); USDOE
Contributing Org.:
EUROfusion Consortium; Wendelstein Team (W7-X); the W7-X Team
OSTI Identifier:
1369186
Alternate Identifier(s):
OSTI ID: 1375764
Report Number(s):
LA-UR-16-27307
Journal ID: ISSN 0029-5515
Grant/Contract Number:  
AC52-06NA25396; 633053
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 8; Conference: 26. IAEA Fusion Energy Conference , Kyoto (Japan), 17-22 Oct 2016; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetic Fusion Energy; Wedelstein 7-X, stellarator, fusion, energy balance, particle confinement

Citation Formats

Hirsch, M., Dinklage, A., Alonso, A., Fuchert, G., Bozhenkov, S., Hoefel, U., Andreeva, T., Baldzuhn, J., Beurskens, M., Bosch, H. S., Beidler, C. D., Biedermann, C., Blanco, E., Brakel, R., Burhenn, R., Buttenschoen, B., Cappa, A., Czarnecka, A., Endler, M., Estrada, T., Fornal, T., Geiger, J., Grulke, O., Harris, J. H., Hartmann, D., Jakubowski, M., Klinger, T., Knauer, J., Kocsis, G., Koenig, R., Kornejew, P., Kraemer-Flecken, A., Krawczyk, N., Krychowiak, M., Kubkowska, M., Ksiazek, I., Langenberg, A., Laqua, H. P., Lazerson, S., Maassberg, H., Marushchenko, N., Marsen, S., Moncada, V., Moseev, D., Naujoks, D., Otte, M., Pablant, N., Pasch, E., Pisano, F., Rahbarnia, K., Schroeder, T., Stange, T., Stephey, L., Szepesi, T., Pedersen, T. Sunn, Mora, H. Trimino, Thomsen, H., Tsuchiya, H., Turkin, Yu., Wauters, T., Weir, G., Wenzel, U., Werner, A., Wolf, R., Wurden, G. A., and Zhang, D.. Confinement in Wendelstein 7-X Limiter Plasmas. United States: N. p., 2017. Web. https://doi.org/10.1088/1741-4326/aa7372.
Hirsch, M., Dinklage, A., Alonso, A., Fuchert, G., Bozhenkov, S., Hoefel, U., Andreeva, T., Baldzuhn, J., Beurskens, M., Bosch, H. S., Beidler, C. D., Biedermann, C., Blanco, E., Brakel, R., Burhenn, R., Buttenschoen, B., Cappa, A., Czarnecka, A., Endler, M., Estrada, T., Fornal, T., Geiger, J., Grulke, O., Harris, J. H., Hartmann, D., Jakubowski, M., Klinger, T., Knauer, J., Kocsis, G., Koenig, R., Kornejew, P., Kraemer-Flecken, A., Krawczyk, N., Krychowiak, M., Kubkowska, M., Ksiazek, I., Langenberg, A., Laqua, H. P., Lazerson, S., Maassberg, H., Marushchenko, N., Marsen, S., Moncada, V., Moseev, D., Naujoks, D., Otte, M., Pablant, N., Pasch, E., Pisano, F., Rahbarnia, K., Schroeder, T., Stange, T., Stephey, L., Szepesi, T., Pedersen, T. Sunn, Mora, H. Trimino, Thomsen, H., Tsuchiya, H., Turkin, Yu., Wauters, T., Weir, G., Wenzel, U., Werner, A., Wolf, R., Wurden, G. A., & Zhang, D.. Confinement in Wendelstein 7-X Limiter Plasmas. United States. https://doi.org/10.1088/1741-4326/aa7372
Hirsch, M., Dinklage, A., Alonso, A., Fuchert, G., Bozhenkov, S., Hoefel, U., Andreeva, T., Baldzuhn, J., Beurskens, M., Bosch, H. S., Beidler, C. D., Biedermann, C., Blanco, E., Brakel, R., Burhenn, R., Buttenschoen, B., Cappa, A., Czarnecka, A., Endler, M., Estrada, T., Fornal, T., Geiger, J., Grulke, O., Harris, J. H., Hartmann, D., Jakubowski, M., Klinger, T., Knauer, J., Kocsis, G., Koenig, R., Kornejew, P., Kraemer-Flecken, A., Krawczyk, N., Krychowiak, M., Kubkowska, M., Ksiazek, I., Langenberg, A., Laqua, H. P., Lazerson, S., Maassberg, H., Marushchenko, N., Marsen, S., Moncada, V., Moseev, D., Naujoks, D., Otte, M., Pablant, N., Pasch, E., Pisano, F., Rahbarnia, K., Schroeder, T., Stange, T., Stephey, L., Szepesi, T., Pedersen, T. Sunn, Mora, H. Trimino, Thomsen, H., Tsuchiya, H., Turkin, Yu., Wauters, T., Weir, G., Wenzel, U., Werner, A., Wolf, R., Wurden, G. A., and Zhang, D.. Wed . "Confinement in Wendelstein 7-X Limiter Plasmas". United States. https://doi.org/10.1088/1741-4326/aa7372. https://www.osti.gov/servlets/purl/1369186.
@article{osti_1369186,
title = {Confinement in Wendelstein 7-X Limiter Plasmas},
author = {Hirsch, M. and Dinklage, A. and Alonso, A. and Fuchert, G. and Bozhenkov, S. and Hoefel, U. and Andreeva, T. and Baldzuhn, J. and Beurskens, M. and Bosch, H. S. and Beidler, C. D. and Biedermann, C. and Blanco, E. and Brakel, R. and Burhenn, R. and Buttenschoen, B. and Cappa, A. and Czarnecka, A. and Endler, M. and Estrada, T. and Fornal, T. and Geiger, J. and Grulke, O. and Harris, J. H. and Hartmann, D. and Jakubowski, M. and Klinger, T. and Knauer, J. and Kocsis, G. and Koenig, R. and Kornejew, P. and Kraemer-Flecken, A. and Krawczyk, N. and Krychowiak, M. and Kubkowska, M. and Ksiazek, I. and Langenberg, A. and Laqua, H. P. and Lazerson, S. and Maassberg, H. and Marushchenko, N. and Marsen, S. and Moncada, V. and Moseev, D. and Naujoks, D. and Otte, M. and Pablant, N. and Pasch, E. and Pisano, F. and Rahbarnia, K. and Schroeder, T. and Stange, T. and Stephey, L. and Szepesi, T. and Pedersen, T. Sunn and Mora, H. Trimino and Thomsen, H. and Tsuchiya, H. and Turkin, Yu. and Wauters, T. and Weir, G. and Wenzel, U. and Werner, A. and Wolf, R. and Wurden, G. A. and Zhang, D.},
abstractNote = {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 centerdot 1019 m-3. With the available 4.3 MW ECR Heating core Te ~ 8 keV, Ti ~ 1–2 keV are achieved routinely resulting in energy confinement time τE between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked Te-profiles and positive Er up to about half of the minor radius. Lastly, profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.},
doi = {10.1088/1741-4326/aa7372},
journal = {Nuclear Fusion},
number = 8,
volume = 57,
place = {United States},
year = {2017},
month = {6}
}

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Works referenced in this record:

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    Works referencing / citing this record:

    Magnetic configuration effects on the Wendelstein 7-X stellarator
    journal, May 2018


    Radial energy flux during destabilized Alfvén eigenmodes
    journal, October 2018

    • Kolesnichenko, Ya. I.; Tykhyy, A. V.
    • Physics of Plasmas, Vol. 25, Issue 10
    • DOI: 10.1063/1.5048380

    Poloidal correlation reflectometry at W7-X: radial electric field and coherent fluctuations
    journal, August 2017

    • Windisch, T.; Krämer-Flecken, A.; Velasco, Jl
    • Plasma Physics and Controlled Fusion, Vol. 59, Issue 10
    • DOI: 10.1088/1361-6587/aa759b

    Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies
    journal, November 2018

    • Wolf, R. C.; Bozhenkov, S.; Dinklage, A.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
    • DOI: 10.1088/1361-6587/aaeab2

    Major results from the first plasma campaign of the Wendelstein 7-X stellarator
    journal, July 2017


    Global energy confinement in the initial limiter configuration of Wendelstein 7-X
    journal, August 2018