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

Research output: Contribution to journal › Article › peer-review

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,

day = "13",

doi = "10.1103/PhysRevLett.109.115003",

language = "English",

volume = "109",

journal = "Physical Review Letters",

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T1 - Fast-particle-driven alfvénic modes in a reversed field pinch

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.

UR - https://www.scopus.com/pages/publications/84866316298

U2 - 10.1103/PhysRevLett.109.115003

DO - 10.1103/PhysRevLett.109.115003

M3 - Article

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SN - 0031-9007

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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