Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations

S. X. Tang; T. A. Carter; N. A. Crocker; W. W. Heidbrink; J. B. Lestz; R. I. Pinsker; K. E. Thome; M. A. Van Zeeland; E. V. Belova

doi:10.1103/PhysRevLett.126.155001

Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations

S. X. Tang, T. A. Carter, N. A. Crocker, W. W. Heidbrink, J. B. Lestz, R. I. Pinsker, K. E. Thome, M. A. Van Zeeland, E. V. Belova

Fusion Energy Division

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

20 Scopus citations

Abstract

Fast-ion driven Alfvén waves with frequency close to the ion cyclotron frequency (f=0.58fci) excited by energetic ions from a neutral beam are stabilized via a controlled energetic ion density ramp for the first time in a fusion research plasma. The scaling of wave amplitude with injection rate is consistent with theory for single mode collisional saturation near marginal stability. The wave is identified as a shear-polarized global Alfvén eigenmode excited by Doppler-shifted cyclotron resonance with fast ions with sub-Alfvénic energetic ions, a first in fusion research plasmas.

Original language	English
Article number	155001
Journal	Physical Review Letters
Volume	126
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.126.155001
State	Published - Apr 16 2021

Funding

J. B. Lestz acknowledges V. N. Duarte for helpful discussions. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Awards No. DE-FC02-04ER54698, No. DE-SC0020337, No. DE-AC02-09CH11466, No. DE-SC0011810, No. DE-FG02-99ER54527, and No. DE-SC0019352.

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10.1103/PhysRevLett.126.155001

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Tang, S. X., Carter, T. A., Crocker, N. A., Heidbrink, W. W., Lestz, J. B., Pinsker, R. I., Thome, K. E., Van Zeeland, M. A., & Belova, E. V. (2021). Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations. Physical Review Letters, 126(15), Article 155001. https://doi.org/10.1103/PhysRevLett.126.155001

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title = "Stabilization of Alfv{\'e}n Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations",

abstract = "Fast-ion driven Alfv{\'e}n waves with frequency close to the ion cyclotron frequency (f=0.58fci) excited by energetic ions from a neutral beam are stabilized via a controlled energetic ion density ramp for the first time in a fusion research plasma. The scaling of wave amplitude with injection rate is consistent with theory for single mode collisional saturation near marginal stability. The wave is identified as a shear-polarized global Alfv{\'e}n eigenmode excited by Doppler-shifted cyclotron resonance with fast ions with sub-Alfv{\'e}nic energetic ions, a first in fusion research plasmas.",

author = "Tang, {S. X.} and Carter, {T. A.} and Crocker, {N. A.} and Heidbrink, {W. W.} and Lestz, {J. B.} and Pinsker, {R. I.} and Thome, {K. E.} and {Van Zeeland}, {M. A.} and Belova, {E. V.}",

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doi = "10.1103/PhysRevLett.126.155001",

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AU - Crocker, N. A.

AU - Heidbrink, W. W.

AU - Lestz, J. B.

AU - Pinsker, R. I.

AU - Thome, K. E.

AU - Van Zeeland, M. A.

AU - Belova, E. V.

PY - 2021/4/16

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AB - Fast-ion driven Alfvén waves with frequency close to the ion cyclotron frequency (f=0.58fci) excited by energetic ions from a neutral beam are stabilized via a controlled energetic ion density ramp for the first time in a fusion research plasma. The scaling of wave amplitude with injection rate is consistent with theory for single mode collisional saturation near marginal stability. The wave is identified as a shear-polarized global Alfvén eigenmode excited by Doppler-shifted cyclotron resonance with fast ions with sub-Alfvénic energetic ions, a first in fusion research plasmas.

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Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations

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