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Title: Gyrokinetic simulations of toroidal Alfvén eigenmodes excited by energetic ions and external antennas on the Joint European Torus

Abstract

The gyrokinetic toroidal code (GTC) has been used to study toroidal Alfvén eigenmodes (TAEs) in high-performance plasmas. Experiments performed at the Joint European Torus (JET), where TAEs were driven by energetic particles arising from neutral beams, ion cyclotron resonant heating, and resonantly excited by dedicated external antennas, have been simulated. Modes driven by populations of energetic particles are observed, matching the TAE frequency seen with magnetic probes in JET experiments. A synthetic antenna, composed of one toroidal and two neighboring poloidal harmonics has been used to probe the modes' damping rates and quantify mechanisms for this damping in GTC simulations. This method was also applied to frequency and damping rate measurements of stable TAEs made by the Alfvén eigenmode active diagnostic in these discharges.

Authors:
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Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
JET Contributors
OSTI Identifier:
1543950
DOE Contract Number:  
AC02-05CH11231; AC05-00OR22725; FG02-99ER54563
Resource Type:
Journal Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 2; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Aslanyan, V., Taimourzadeh, S., Shi, L., Lin, Z., Dong, G., Puglia, P., Porkolab, M., Dumont, R., Sharapov, S. E., Mailloux, J., Tsalas, M., Maslov, M., Whitehead, A., Scannell, R., Gerasimov, S., Dorling, S., Dowson, S., Sheikh, H. K., Blackman, T., Jones, G., Goodyear, A., Kirov, K. K., Blanchard, P., Fasoli, A., and Testa, D. Gyrokinetic simulations of toroidal Alfvén eigenmodes excited by energetic ions and external antennas on the Joint European Torus. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aaf430.
Aslanyan, V., Taimourzadeh, S., Shi, L., Lin, Z., Dong, G., Puglia, P., Porkolab, M., Dumont, R., Sharapov, S. E., Mailloux, J., Tsalas, M., Maslov, M., Whitehead, A., Scannell, R., Gerasimov, S., Dorling, S., Dowson, S., Sheikh, H. K., Blackman, T., Jones, G., Goodyear, A., Kirov, K. K., Blanchard, P., Fasoli, A., & Testa, D. Gyrokinetic simulations of toroidal Alfvén eigenmodes excited by energetic ions and external antennas on the Joint European Torus. United States. https://doi.org/10.1088/1741-4326/aaf430
Aslanyan, V., Taimourzadeh, S., Shi, L., Lin, Z., Dong, G., Puglia, P., Porkolab, M., Dumont, R., Sharapov, S. E., Mailloux, J., Tsalas, M., Maslov, M., Whitehead, A., Scannell, R., Gerasimov, S., Dorling, S., Dowson, S., Sheikh, H. K., Blackman, T., Jones, G., Goodyear, A., Kirov, K. K., Blanchard, P., Fasoli, A., and Testa, D. 2018. "Gyrokinetic simulations of toroidal Alfvén eigenmodes excited by energetic ions and external antennas on the Joint European Torus". United States. https://doi.org/10.1088/1741-4326/aaf430.
@article{osti_1543950,
title = {Gyrokinetic simulations of toroidal Alfvén eigenmodes excited by energetic ions and external antennas on the Joint European Torus},
author = {Aslanyan, V. and Taimourzadeh, S. and Shi, L. and Lin, Z. and Dong, G. and Puglia, P. and Porkolab, M. and Dumont, R. and Sharapov, S. E. and Mailloux, J. and Tsalas, M. and Maslov, M. and Whitehead, A. and Scannell, R. and Gerasimov, S. and Dorling, S. and Dowson, S. and Sheikh, H. K. and Blackman, T. and Jones, G. and Goodyear, A. and Kirov, K. K. and Blanchard, P. and Fasoli, A. and Testa, D.},
abstractNote = {The gyrokinetic toroidal code (GTC) has been used to study toroidal Alfvén eigenmodes (TAEs) in high-performance plasmas. Experiments performed at the Joint European Torus (JET), where TAEs were driven by energetic particles arising from neutral beams, ion cyclotron resonant heating, and resonantly excited by dedicated external antennas, have been simulated. Modes driven by populations of energetic particles are observed, matching the TAE frequency seen with magnetic probes in JET experiments. A synthetic antenna, composed of one toroidal and two neighboring poloidal harmonics has been used to probe the modes' damping rates and quantify mechanisms for this damping in GTC simulations. This method was also applied to frequency and damping rate measurements of stable TAEs made by the Alfvén eigenmode active diagnostic in these discharges.},
doi = {10.1088/1741-4326/aaf430},
url = {https://www.osti.gov/biblio/1543950}, journal = {Nuclear Fusion},
issn = {0029-5515},
number = 2,
volume = 59,
place = {United States},
year = {Fri Dec 21 00:00:00 EST 2018},
month = {Fri Dec 21 00:00:00 EST 2018}
}

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