Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity

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

doi:10.1103/PhysRevLett.99.245002

Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity

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

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109 Scopus citations

Abstract

Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion Dα (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.

Original language	English (US)
Article number	245002
Journal	Physical review letters
Volume	99
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.99.245002
State	Published - Dec 12 2007

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.99.245002

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title = "Anomalous flattening of the fast-ion profile during Alfv{\'e}n-Eigenmode activity",

abstract = "Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfv{\'e}n eigenmodes in the DIII-D tokamak. The first application of fast-ion Dα (FIDA) spectroscopy to Alfv{\'e}n-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.",

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

year = "2007",

month = dec,

day = "12",

doi = "10.1103/PhysRevLett.99.245002",

language = "English (US)",

volume = "99",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

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TY - JOUR

T1 - Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity

AU - Heidbrink, W. W.

AU - Gorelenkov, N. N.

AU - Luo, Y.

AU - Van Zeeland, M. A.

AU - White, R. B.

AU - Austin, M. E.

AU - Burrell, K. H.

AU - Kramer, G. J.

AU - Makowski, M. A.

AU - McKee, G. R.

AU - Nazikian, R.

PY - 2007/12/12

Y1 - 2007/12/12

N2 - Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion Dα (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.

AB - Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion Dα (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.

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U2 - 10.1103/PhysRevLett.99.245002

DO - 10.1103/PhysRevLett.99.245002

M3 - Article

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SN - 0031-9007

VL - 99

JO - Physical review letters

JF - Physical review letters

IS - 24

M1 - 245002

ER -

Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity

Abstract

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