Central flattening of the fast-ion profile in reversed-shear DIII-D discharges

W. W. Heidbrink; M. A. Van Zeeland; M. E. Austin; K. H. Burrell; N. N. Gorelenkov; G. J. Kramer; Y. Luo; M. A. Makowski; G. R. McKee; C. Muscatello; R. Nazikian; E. Ruskov; W. M. Solomon; R. B. White; Y. Zhu

doi:10.1088/0029-5515/48/8/084001

Central flattening of the fast-ion profile in reversed-shear DIII-D discharges

W. W. Heidbrink, M. A. Van Zeeland, M. E. Austin, K. H. Burrell, N. N. Gorelenkov, G. J. Kramer, Y. Luo, M. A. Makowski, G. R. McKee, C. Muscatello, R. Nazikian, E. Ruskov, W. M. Solomon, R. B. White, Y. Zhu

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51 Scopus citations

Abstract

Neutral beam injection into a plasma with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The application of fast-ion D _α (FIDA) spectroscopy shows that the central fast-ion profile is flattened in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The temporal evolution of the current profile is also strongly modified. Studies in similar discharges show that flattening of the profile correlates with the mode amplitude and that both types of Alfvén modes correlate with fast-ion transport. Calculations by the ORBIT code do not explain the observed fast-ion transport for the measured mode amplitudes, however. Possible explanations for the discrepancy are considered.

Original language	English (US)
Article number	084001
Journal	Nuclear Fusion
Volume	48
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/48/8/084001
State	Published - Aug 1 2008

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Heidbrink, W. W., Van Zeeland, M. A., Austin, M. E., Burrell, K. H., Gorelenkov, N. N., Kramer, G. J., Luo, Y., Makowski, M. A., McKee, G. R., Muscatello, C., Nazikian, R., Ruskov, E., Solomon, W. M., White, R. B., & Zhu, Y. (2008). Central flattening of the fast-ion profile in reversed-shear DIII-D discharges. Nuclear Fusion, 48(8), Article 084001. https://doi.org/10.1088/0029-5515/48/8/084001

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title = "Central flattening of the fast-ion profile in reversed-shear DIII-D discharges",

abstract = "Neutral beam injection into a plasma with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfv{\'e}n eigenmodes in the DIII-D tokamak. The application of fast-ion D α (FIDA) spectroscopy shows that the central fast-ion profile is flattened in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The temporal evolution of the current profile is also strongly modified. Studies in similar discharges show that flattening of the profile correlates with the mode amplitude and that both types of Alfv{\'e}n modes correlate with fast-ion transport. Calculations by the ORBIT code do not explain the observed fast-ion transport for the measured mode amplitudes, however. Possible explanations for the discrepancy are considered.",

author = "Heidbrink, \{W. W.\} and \{Van Zeeland\}, \{M. A.\} and Austin, \{M. E.\} and Burrell, \{K. H.\} and Gorelenkov, \{N. N.\} and Kramer, \{G. J.\} and Y. Luo and Makowski, \{M. A.\} and McKee, \{G. R.\} and C. Muscatello and R. Nazikian and E. Ruskov and Solomon, \{W. M.\} and White, \{R. B.\} and Y. Zhu",

year = "2008",

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doi = "10.1088/0029-5515/48/8/084001",

language = "English (US)",

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journal = "Nuclear Fusion",

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TY - JOUR

T1 - Central flattening of the fast-ion profile in reversed-shear DIII-D discharges

AU - Heidbrink, W. W.

AU - Van Zeeland, M. A.

AU - Austin, M. E.

AU - Burrell, K. H.

AU - Gorelenkov, N. N.

AU - Kramer, G. J.

AU - Luo, Y.

AU - Makowski, M. A.

AU - McKee, G. R.

AU - Muscatello, C.

AU - Nazikian, R.

AU - Ruskov, E.

AU - Solomon, W. M.

AU - White, R. B.

AU - Zhu, Y.

PY - 2008/8/1

Y1 - 2008/8/1

N2 - Neutral beam injection into a plasma with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The application of fast-ion D α (FIDA) spectroscopy shows that the central fast-ion profile is flattened in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The temporal evolution of the current profile is also strongly modified. Studies in similar discharges show that flattening of the profile correlates with the mode amplitude and that both types of Alfvén modes correlate with fast-ion transport. Calculations by the ORBIT code do not explain the observed fast-ion transport for the measured mode amplitudes, however. Possible explanations for the discrepancy are considered.

AB - Neutral beam injection into a plasma with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The application of fast-ion D α (FIDA) spectroscopy shows that the central fast-ion profile is flattened in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The temporal evolution of the current profile is also strongly modified. Studies in similar discharges show that flattening of the profile correlates with the mode amplitude and that both types of Alfvén modes correlate with fast-ion transport. Calculations by the ORBIT code do not explain the observed fast-ion transport for the measured mode amplitudes, however. Possible explanations for the discrepancy are considered.

UR - https://www.scopus.com/pages/publications/51849099545

UR - https://www.scopus.com/inward/citedby.url?scp=51849099545&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/48/8/084001

DO - 10.1088/0029-5515/48/8/084001

M3 - Article

AN - SCOPUS:51849099545

SN - 0029-5515

VL - 48

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

M1 - 084001

ER -

Central flattening of the fast-ion profile in reversed-shear DIII-D discharges

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