Global energy confinement in the initial limiter configuration of Wendelstein 7-X
Abstract
Global confinement properties of the limiter plasmas of the first operational campaign of W7-X are investigated with special focus on the energy confinement and possible operational limits. The energy confinement time was found to be close to expectations from the empirical ISS04 scaling for stellarators. Absolute values up to 160 ms were achieved. This can be considered as a great success for the initial operation of the device. However, a clear degradation of the performance was observed when radiative losses became significant, which was typically the case at low heating power. While a significant improvement of the plasma purity is expected during divertor operation, the presented results underline the importance of the impurity dynamics for the development of high-performance steady-state scenarios in W7-X. Furthermore, comparisons of the global performance properties with neoclassical transport modeling are presented. Furthermore, these studies are not yet fully conclusive, which could indicate that anomalous transport may have played an essential role in the low-density OP1.1 plasmas.
- Authors:
-
[1];
[1];
more »
- Max-Planck-Institut fur Plasmaphysik, Greifswald (Germany)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- CIEMAT, Madrid (Spain)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- W7-X Team
- OSTI Identifier:
- 1470942
- Grant/Contract Number:
- 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 10; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Wendelstein 7-X; energy confinement; stellarator
Citation Formats
Fuchert, G., Bozhenkov, S. A., Pablant, N., Rahbarnia, K., Turkin, Y., Alonso, A., Andreeva, T., Beidler, C. D., Beurskens, M., Dinklage, A., Geiger, J., Hirsch, M., Höfel, U., Knauer, J., Langenberg, A., Laqua, H. P., Niemann, H., Pasch, E., Pedersen, T. Sunn, Stange, T., Svensson, J., Trimino Mora, H., Wurden, G. A., Zhang, D., and Wolf, R. C. Global energy confinement in the initial limiter configuration of Wendelstein 7-X. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aad78b.
Fuchert, G., Bozhenkov, S. A., Pablant, N., Rahbarnia, K., Turkin, Y., Alonso, A., Andreeva, T., Beidler, C. D., Beurskens, M., Dinklage, A., Geiger, J., Hirsch, M., Höfel, U., Knauer, J., Langenberg, A., Laqua, H. P., Niemann, H., Pasch, E., Pedersen, T. Sunn, Stange, T., Svensson, J., Trimino Mora, H., Wurden, G. A., Zhang, D., & Wolf, R. C. Global energy confinement in the initial limiter configuration of Wendelstein 7-X. United States. https://doi.org/10.1088/1741-4326/aad78b
Fuchert, G., Bozhenkov, S. A., Pablant, N., Rahbarnia, K., Turkin, Y., Alonso, A., Andreeva, T., Beidler, C. D., Beurskens, M., Dinklage, A., Geiger, J., Hirsch, M., Höfel, U., Knauer, J., Langenberg, A., Laqua, H. P., Niemann, H., Pasch, E., Pedersen, T. Sunn, Stange, T., Svensson, J., Trimino Mora, H., Wurden, G. A., Zhang, D., and Wolf, R. C. Wed .
"Global energy confinement in the initial limiter configuration of Wendelstein 7-X". United States. https://doi.org/10.1088/1741-4326/aad78b. https://www.osti.gov/servlets/purl/1470942.
@article{osti_1470942,
title = {Global energy confinement in the initial limiter configuration of Wendelstein 7-X},
author = {Fuchert, G. and Bozhenkov, S. A. and Pablant, N. and Rahbarnia, K. and Turkin, Y. and Alonso, A. and Andreeva, T. and Beidler, C. D. and Beurskens, M. and Dinklage, A. and Geiger, J. and Hirsch, M. and Höfel, U. and Knauer, J. and Langenberg, A. and Laqua, H. P. and Niemann, H. and Pasch, E. and Pedersen, T. Sunn and Stange, T. and Svensson, J. and Trimino Mora, H. and Wurden, G. A. and Zhang, D. and Wolf, R. C.},
abstractNote = {Global confinement properties of the limiter plasmas of the first operational campaign of W7-X are investigated with special focus on the energy confinement and possible operational limits. The energy confinement time was found to be close to expectations from the empirical ISS04 scaling for stellarators. Absolute values up to 160 ms were achieved. This can be considered as a great success for the initial operation of the device. However, a clear degradation of the performance was observed when radiative losses became significant, which was typically the case at low heating power. While a significant improvement of the plasma purity is expected during divertor operation, the presented results underline the importance of the impurity dynamics for the development of high-performance steady-state scenarios in W7-X. Furthermore, comparisons of the global performance properties with neoclassical transport modeling are presented. Furthermore, these studies are not yet fully conclusive, which could indicate that anomalous transport may have played an essential role in the low-density OP1.1 plasmas.},
doi = {10.1088/1741-4326/aad78b},
journal = {Nuclear Fusion},
number = 10,
volume = 58,
place = {United States},
year = {Wed Aug 29 00:00:00 EDT 2018},
month = {Wed Aug 29 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies
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First results from divertor operation in Wendelstein 7-X
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Observation of anomalous impurity transport during low-density experiments in W7-X with laser blow-off injections of iron
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Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies
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