Fast-particle-driven alfvénic modes in a reversed field pinch

J. J. Koliner; C. B. Forest; J. S. Sarff; J. K. Anderson; D. Liu; M. D. Nornberg; J. Waksman; L. Lin; D. L. Brower; W. X. Ding; D. A. Spong

doi:10.1103/PhysRevLett.109.115003

Fast-particle-driven alfvénic modes in a reversed field pinch

J. J. Koliner, C. B. Forest, J. S. Sarff, J. K. Anderson, D. Liu, M. D. Nornberg, J. Waksman, L. Lin, D. L. Brower, W. X. Ding, D. A. Spong

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19 Scopus citations

Abstract

Alfvénic modes are observed due to neutral beam injection for the first time in a reversed field pinch plasma. Modeling of the beam deposition and slowing down shows that the velocity and radial localization are high. This allows instability drive from inverse Landau damping of a bump-on-tail in the parallel distribution function or from free energy in the fast ion density gradient. Mode switching from a lower frequency toroidal mode number n=5 mode that scales with beam injection velocity to a higher frequency n=4 mode with Alfvénic scaling is observed.

Original language	English
Article number	115003
Journal	Physical Review Letters
Volume	109
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.109.115003
State	Published - Sep 13 2012

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title = "Fast-particle-driven alfv{\'e}nic modes in a reversed field pinch",

abstract = "Alfv{\'e}nic modes are observed due to neutral beam injection for the first time in a reversed field pinch plasma. Modeling of the beam deposition and slowing down shows that the velocity and radial localization are high. This allows instability drive from inverse Landau damping of a bump-on-tail in the parallel distribution function or from free energy in the fast ion density gradient. Mode switching from a lower frequency toroidal mode number n=5 mode that scales with beam injection velocity to a higher frequency n=4 mode with Alfv{\'e}nic scaling is observed.",

author = "Koliner, {J. J.} and Forest, {C. B.} and Sarff, {J. S.} and Anderson, {J. K.} and D. Liu and Nornberg, {M. D.} and J. Waksman and L. Lin and Brower, {D. L.} and Ding, {W. X.} and Spong, {D. A.}",

year = "2012",

month = sep,

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doi = "10.1103/PhysRevLett.109.115003",

language = "English",

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AU - Koliner, J. J.

AU - Forest, C. B.

AU - Sarff, J. S.

AU - Anderson, J. K.

AU - Liu, D.

AU - Nornberg, M. D.

AU - Waksman, J.

AU - Lin, L.

AU - Brower, D. L.

AU - Ding, W. X.

AU - Spong, D. A.

PY - 2012/9/13

Y1 - 2012/9/13

N2 - Alfvénic modes are observed due to neutral beam injection for the first time in a reversed field pinch plasma. Modeling of the beam deposition and slowing down shows that the velocity and radial localization are high. This allows instability drive from inverse Landau damping of a bump-on-tail in the parallel distribution function or from free energy in the fast ion density gradient. Mode switching from a lower frequency toroidal mode number n=5 mode that scales with beam injection velocity to a higher frequency n=4 mode with Alfvénic scaling is observed.

AB - Alfvénic modes are observed due to neutral beam injection for the first time in a reversed field pinch plasma. Modeling of the beam deposition and slowing down shows that the velocity and radial localization are high. This allows instability drive from inverse Landau damping of a bump-on-tail in the parallel distribution function or from free energy in the fast ion density gradient. Mode switching from a lower frequency toroidal mode number n=5 mode that scales with beam injection velocity to a higher frequency n=4 mode with Alfvénic scaling is observed.

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U2 - 10.1103/PhysRevLett.109.115003

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VL - 109

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 115003

ER -

Fast-particle-driven alfvénic modes in a reversed field pinch

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