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Langenberg A, Pablant NA, Wegner T, Traverso P, Marchuk O, Bräuer T, Geiger B, Fuchert G, Bozhenkov S, Pasch E, Grulke O, Kunkel F, Killer C, Nicolai D, Satheeswaran G, Hollfeld KP, Schweer B, Krings T, Drews P, Offermanns G, Pavone A, Svensson J, Alonso JA, Burhenn R, Wolf RC. Prospects of X-ray imaging spectrometers for impurity transport: Recent results from the stellarator Wendelstein 7-X (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10G101. [PMID: 30399890 DOI: 10.1063/1.5036536] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Abstract
This paper reports on the design and the performance of the recently upgraded X-ray imaging spectrometer systems, X-ray imaging crystal spectrometer and high resolution X-ray imaging spectrometer, installed at the optimized stellarator Wendelstein 7-X. High resolution spectra of highly ionized, He-like Si, Ar, Ti, and Fe as well as H-like Ar have been observed. A cross comparison of ion and electron temperature profiles derived from a spectral fit and tomographic inversion of Ar and Fe spectra shows a reasonable match with both the spectrometers. The also measured impurity density profiles of Ar and Fe have peaked densities at radial positions that are in qualitative agreement with the expectations from the He-like impurity fractional abundances, given the measured temperature profiles. Repeated measurements of impurity decay times have been demonstrated with an accuracy of 1 ms via injection of non-recycling Ti, Fe, and Mo impurities using a laser blow-off system.
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Affiliation(s)
- A Langenberg
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - N A Pablant
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - Th Wegner
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - P Traverso
- Auburn University, Auburn, Alabama 36849, USA
| | - O Marchuk
- Department of Physics, PPFE, Technical University of Denmark DTU, DK-2800 Lyngby, Denmark
| | - T Bräuer
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - B Geiger
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - G Fuchert
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - S Bozhenkov
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - E Pasch
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - O Grulke
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - F Kunkel
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - C Killer
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - D Nicolai
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - G Satheeswaran
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - K P Hollfeld
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - B Schweer
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - T Krings
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - P Drews
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - G Offermanns
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, 52425 Jülich, Germany
| | - A Pavone
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - J Svensson
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - J A Alonso
- Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, Madrid, Spain
| | - R Burhenn
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
| | - R C Wolf
- Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
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Yoshinuma M, Ida K, Yokoyama M, Osakabe M, Nagaoka K, Morita S, Goto M, Tamura N, Suzuki C, Yoshimura S, Funaba H, Takeiri Y, Ikeda K, Tsumori K, Kaneko O. Spontaneous Toroidal Flow and Impurity Hole in the High Ion Temperature Plasma on LHD. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst10-a10797] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Yoshinuma
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - N. Tamura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - C. Suzuki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Yoshimura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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Nishimura S, Sugama H. Neoclassical Transport Including Impurities and the Bootstrap Current in Advanced Helical Systems. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst04-a542] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shin Nishimura
- National Institute for Fusion Science, Oroshi 322-6, Toki 509-5292, Japan
| | - Hideo Sugama
- National Institute for Fusion Science, Oroshi 322-6, Toki 509-5292, Japan
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Ida K, Yoshinuma M, Tanaka K, Sakamoto R, Inagaki S. Interplay between Particle Momentum and Heat Transport. FUSION SCIENCE AND TECHNOLOGY 2010. [DOI: 10.13182/fst10-a10802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- K. Ida
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Tanaka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Inagaki
- National Institute for Fusion Science, Toki 509-5292, Japan
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Gonçalves B, Hidalgo C, Pedrosa MA, Orozco RO, Sánchez E, Silva C. Role of turbulence on edge momentum redistribution in the TJ-II stellarator. PHYSICAL REVIEW LETTERS 2006; 96:145001. [PMID: 16712083 DOI: 10.1103/physrevlett.96.145001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2005] [Indexed: 05/09/2023]
Abstract
Radial profiles of the parallel-radial Reynolds stress component, proportional to the cross correlation between parallel and radial fluctuating velocities, have been measured in the plasma boundary region of the TJ-II stellarator. Experimental results show the existence of significant parallel turbulent forces at plasma densities above the threshold value to trigger perpendicular sheared flows. This finding provides the first experimental evidence of the role of parallel turbulence forces on edge momentum redistribution in fusion devices.
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Affiliation(s)
- B Gonçalves
- Associação Euratom-IST, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
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