Interpretation of electromagnetic modes in the sub-TAE frequency range in JET plasmas with elevated monotonic q-profiles

Fil, N.; Sharapov, S. E.; Fitzgerald, M.; Choi, G. J.; Lin, Z.; Tinguely, R. A.; Oliver, H. C.; McClements, K. G.; Puglia, P. G.; Dumont, R. J.; Porkolab, M.; Mailloux, J.; Joffrin, E.

doi:10.1063/5.0057844

Interpretation of electromagnetic modes in the sub-TAE frequency range in JET plasmas with elevated monotonic q-profiles

Journal Article · Wed Oct 27 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0057844· OSTI ID:1978940

^[1]; ^[2]; Fitzgerald, M. ^[2]; Choi, G. J. ^[3]; ^[3]; ^[4]; Oliver, H. C. ^[2]; ^[2]; Puglia, P. G. ^[5]; ^[6]; Porkolab, M. ^[4]; Mailloux, J. ^[2]; Joffrin, E. ^[6]

UK Atomic Energy Authority Research Group, Abingdon (United Kingdom). Culham Laboratory; Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
UK Atomic Energy Authority Research Group, Abingdon (United Kingdom). Culham Laboratory
University of California, Irvine, CA (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Alternative Energies and Atomic Energy Commission (CEA), Saint-Paul-lez-Durance (France)

Recent JET deuterium experiments with an advanced tokamak scenario using an internal transport barrier (ITB) have been performed to clearly observe destabilized toroidicity-induced Alfvén eigenmodes (TAEs) by fast ions; interestingly, these also exhibit unstable electromagnetic (EM) perturbations in the sub-TAE frequency range. We identify such EM perturbations to be beta-induced ion temperature gradient (BTG) eigenmodes and not beta-induced Alfvén eigenmodes nor beta-induced Alfvén acoustic eigenmodes, which are often unstable in such high-beta plasmas with high-power neutral beam injection (NBI). The BTG modes are the most unstable modes due to the high thermal ion temperature gradient related to the ITB, high thermal ion temperature compared to thermal electron temperature (high T_i/T⁠_e), and a high ion beta regime. BTG mode experimental characteristics match the analytical theory, i.e., location in the vicinity of a rational magnetic surface with a low magnetic shear, mode frequency scaling with the ion diamagnetic frequency (⁠ω$$^*_i$$⁠), and a coupling among Alfvén and drift waves. We also perform linear gyrokinetic simulations with validated plasma profiles and equilibrium, and find a mode kinetically driven by thermal ions with similar characteristics as the experimental BTG modes.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); University of California, Oakland, CA (United States)

Sponsoring Organization:: EUROfusion Consortium; National Energy Research Scientific Computing Center (NERSC); Resuscitation Council UK; USDOE; USDOE Office of Science (SC)

Contributing Organization:: JET Contributors

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

OSTI ID:: 1978940

Alternate ID(s):: OSTI ID: 1827773

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Interpretation of electromagnetic modes in the sub-TAE frequency range in JET plasmas with elevated monotonic q-profiles

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