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

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.

doi:10.1088/1741-4326/aaf430

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

Journal Article · Fri Dec 21 04:00:00 EST 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aaf430· OSTI ID:1543950

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. more »

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.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Laboratory (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 (Unted States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: JET Contributors

DOE Contract Number:: AC02-05CH11231; AC05-00OR22725; FG02-99ER54563

OSTI ID:: 1543950

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 59; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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