Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode
Abstract
The aim of the present study is to analyze the saturation regime of the energetic-ion-driven resistive interchange mode (EIC) in the LHD plasma. In this work, a set of nonlinear simulations are performed by the FAR3d code that uses a reduced MHD model for the thermal plasma coupled with a gyrofluid model for the energetic particle (EP) species. The hellically trapped EP component is introduced through a modification of the averaged drift velocity operator to include their precessional drift. The nonlinear simulation results show similar 1/1 EIC saturation phases with respect to the experimental observations, reproducing the enhancement of the n/m = 1/1 resistive interchange modes (RIC) amplitude and width as the EP β increases, the EP β threshold for the 1/1 EIC excitation, the further destabilization of the 1/1 EIC as the population of the helically trapped EP increases and the triggering of burst events. The frequency of the 1/1 EIC calculated during the burst event is 9.4 kHz and the 2/2 and 3/3 overtones are destabilized, consistent with the frequency range and the complex mode structure measured in the experiment. In addition, the simulation shows the inward propagation of the 1/1 EIC due to the nonlinear destabilization ofmore »
- Authors:
-
- Universidad Carlos III de Madrid (Spain); National Institute of Natural Science, Toki (Japan); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Universidad Carlos III de Madrid (Spain)
- National Institute of Natural Science, Toki (Japan)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1847501
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 12; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MHD; AE; stability; EIC; non linear; optimization; LHD
Citation Formats
Varela, Jacobo, Spong, Donald A., Garcia, Luis, Ohdachi, S., Watanabe, K. Y., Seki, Ryosuke, and Ghai, Yashika. Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode. United States: N. p., 2021.
Web. doi:10.1088/1741-4326/ac26a0.
Varela, Jacobo, Spong, Donald A., Garcia, Luis, Ohdachi, S., Watanabe, K. Y., Seki, Ryosuke, & Ghai, Yashika. Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode. United States. https://doi.org/10.1088/1741-4326/ac26a0
Varela, Jacobo, Spong, Donald A., Garcia, Luis, Ohdachi, S., Watanabe, K. Y., Seki, Ryosuke, and Ghai, Yashika. Fri .
"Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode". United States. https://doi.org/10.1088/1741-4326/ac26a0. https://www.osti.gov/servlets/purl/1847501.
@article{osti_1847501,
title = {Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode},
author = {Varela, Jacobo and Spong, Donald A. and Garcia, Luis and Ohdachi, S. and Watanabe, K. Y. and Seki, Ryosuke and Ghai, Yashika},
abstractNote = {The aim of the present study is to analyze the saturation regime of the energetic-ion-driven resistive interchange mode (EIC) in the LHD plasma. In this work, a set of nonlinear simulations are performed by the FAR3d code that uses a reduced MHD model for the thermal plasma coupled with a gyrofluid model for the energetic particle (EP) species. The hellically trapped EP component is introduced through a modification of the averaged drift velocity operator to include their precessional drift. The nonlinear simulation results show similar 1/1 EIC saturation phases with respect to the experimental observations, reproducing the enhancement of the n/m = 1/1 resistive interchange modes (RIC) amplitude and width as the EP β increases, the EP β threshold for the 1/1 EIC excitation, the further destabilization of the 1/1 EIC as the population of the helically trapped EP increases and the triggering of burst events. The frequency of the 1/1 EIC calculated during the burst event is 9.4 kHz and the 2/2 and 3/3 overtones are destabilized, consistent with the frequency range and the complex mode structure measured in the experiment. In addition, the simulation shows the inward propagation of the 1/1 EIC due to the nonlinear destabilization of the 3/4 and 2/3 energetic particle modes, leading to the partial overlapping between resonances during the burst event. Finally, the analysis of the 1/1 EIC stabilization phase shows the excitation of the 1/1 RIC as soon as the flattening induced by the 1/1 EIC in the pressure profile vanishes, leading to the retrieval of the pressure gradient at the plasma periphery and the overcoming of the RIC stability limit.},
doi = {10.1088/1741-4326/ac26a0},
journal = {Nuclear Fusion},
number = 12,
volume = 61,
place = {United States},
year = {Fri Oct 22 00:00:00 EDT 2021},
month = {Fri Oct 22 00:00:00 EDT 2021}
}
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