U.S. Department of EnergyOffice of Scientific and Technical Information
A novel measurement of marginal Alfven Eigenmode stability during high power auxiliary heating in JET
Abstract
The interaction of Alfven Eigenmodes (AEs) and energetic particles is one of many important factors determining the success of future tokamaks. In JET, eight in-vessel antennas were installed to actively probe stable AEs with frequencies ranging 25-250 kHz and toroidal mode numbers |n| < 20. During the 2019-2020 deuterium campaign, almost 7500 resonances and their frequencies f0, net damping rates \gamma < 0, and toroidal mode numbers were measured in almost 800 plasma discharges. From a statistical analysis of this database, continuum and radiative damping are inferred to increase with edge safety factor, edge magnetic shear, and when including non-ideal effects. Both stable AE observations and their associated damping rates are found to decrease with |n|. Active antenna excitation is also found to be ineffective in H-mode as opposed to L-mode; this is likely due to the increased edge density gradient's effect on accessibility and ELM-related noise's impact on mode identification. A novel measurement is reported of a marginally stable, edge-localized Ellipticity-induced AE probed by the antennas during high-power auxiliary heating (ICRH and NBI) up to 25 MW. NOVA-K kinetic-MHD simulations show good agreement with experimental measurements of f0, \gamma, and n, indicating the dominance of continuum and electron Landaumore »
- Authors:
- Publication Date:
- DOE Contract Number:
- SC0014264; AC02-09CH11466
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
- OSTI Identifier:
- 1887436
- DOI:
- https://doi.org/10.7910/DVN/HGBWIL
Citation Formats
Tinguely, R. A., Fil, N., Puglia, P. G., Dowson, S., Porkolab, M., Guillemot, V., Podesta, M., Baruzzo, M., Dumont, R., Fasoli, A., Fitzgerald, M., Kazakov, Ye. O., Nave, M. F. F., Nocente, M., Ongena, J., Sharapov, S. E., Stancar, Z., and JET Contributors. A novel measurement of marginal Alfven Eigenmode stability during high power auxiliary heating in JET. United States: N. p., 2021.
Web. doi:10.7910/DVN/HGBWIL.
Tinguely, R. A., Fil, N., Puglia, P. G., Dowson, S., Porkolab, M., Guillemot, V., Podesta, M., Baruzzo, M., Dumont, R., Fasoli, A., Fitzgerald, M., Kazakov, Ye. O., Nave, M. F. F., Nocente, M., Ongena, J., Sharapov, S. E., Stancar, Z., & JET Contributors. A novel measurement of marginal Alfven Eigenmode stability during high power auxiliary heating in JET. United States. doi:https://doi.org/10.7910/DVN/HGBWIL
Tinguely, R. A., Fil, N., Puglia, P. G., Dowson, S., Porkolab, M., Guillemot, V., Podesta, M., Baruzzo, M., Dumont, R., Fasoli, A., Fitzgerald, M., Kazakov, Ye. O., Nave, M. F. F., Nocente, M., Ongena, J., Sharapov, S. E., Stancar, Z., and JET Contributors. 2021.
"A novel measurement of marginal Alfven Eigenmode stability during high power auxiliary heating in JET". United States. doi:https://doi.org/10.7910/DVN/HGBWIL. https://www.osti.gov/servlets/purl/1887436. Pub date:Tue Dec 07 00:00:00 EST 2021
@article{osti_1887436,
title = {A novel measurement of marginal Alfven Eigenmode stability during high power auxiliary heating in JET},
author = {Tinguely, R. A. and Fil, N. and Puglia, P. G. and Dowson, S. and Porkolab, M. and Guillemot, V. and Podesta, M. and Baruzzo, M. and Dumont, R. and Fasoli, A. and Fitzgerald, M. and Kazakov, Ye. O. and Nave, M. F. F. and Nocente, M. and Ongena, J. and Sharapov, S. E. and Stancar, Z. and JET Contributors},
abstractNote = {The interaction of Alfven Eigenmodes (AEs) and energetic particles is one of many important factors determining the success of future tokamaks. In JET, eight in-vessel antennas were installed to actively probe stable AEs with frequencies ranging 25-250 kHz and toroidal mode numbers |n| < 20. During the 2019-2020 deuterium campaign, almost 7500 resonances and their frequencies f0, net damping rates \gamma < 0, and toroidal mode numbers were measured in almost 800 plasma discharges. From a statistical analysis of this database, continuum and radiative damping are inferred to increase with edge safety factor, edge magnetic shear, and when including non-ideal effects. Both stable AE observations and their associated damping rates are found to decrease with |n|. Active antenna excitation is also found to be ineffective in H-mode as opposed to L-mode; this is likely due to the increased edge density gradient's effect on accessibility and ELM-related noise's impact on mode identification. A novel measurement is reported of a marginally stable, edge-localized Ellipticity-induced AE probed by the antennas during high-power auxiliary heating (ICRH and NBI) up to 25 MW. NOVA-K kinetic-MHD simulations show good agreement with experimental measurements of f0, \gamma, and n, indicating the dominance of continuum and electron Landau damping in this case. Similar experimental and computational studies are planned for the recent hydrogen and ongoing tritium campaigns, in preparation for the upcoming DT campaign.},
doi = {10.7910/DVN/HGBWIL},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {12}
}
Works referencing / citing this record:
A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET
journal, April 2022
- Tinguely, R. A.; Fil, N.; Puglia, P. G.
- Nuclear Fusion, Vol. 62, Issue 7