Effects of negative triangularity shaping on energetic particle driven Alfvén eigenmodes in DIII-D
Abstract
Shape variations from positive to negative triangularity may lead to improved performance regimes in a tokamak with a reduction in microturbulence as well as improved thermal confinement. The motivation of this investigation is to model and compare the neutral beam driven Alfvén eigenmode (AE) activity in two DIII-D discharges with positive and negative triangularity shaping of plasma. The simulations are performed using the linear version of the FAR3d code, which solves the reduced MHD equations for thermal plasma with addition of moment equations for the energetic ion density and parallel velocity with appropriate Landau closure relations. Overall, our numerical results indicate that for similar physical parameters, the unstable AEs observed in the negative triangularity case have lower growth rates as compared to the positive triangularity regime. Our findings may be useful to analyze the influence of the reverse-D like geometry on the AE instabilities in DIII-D and may lead to better configurations for minimizing fast ion losses in a tokamak device.
- Authors:
-
[1];
[1];
[2];
[2];
[3];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. Carlos III de Madrid (Spain)
- General Atomics, San Diego, CA (United States)
- Univ. of Texas, Austin, TX (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)
- OSTI Identifier:
- 1830111
- Grant/Contract Number:
- AC05-00OR22725; FC02-04ER54698
- 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
Citation Formats
Ghai, Y., Spong, D. A., Varela, J., Garcia, L., Van Zeeland, M. A., and Austin, M. E. Effects of negative triangularity shaping on energetic particle driven Alfvén eigenmodes in DIII-D. United States: N. p., 2021.
Web. doi:10.1088/1741-4326/ac2bc0.
Ghai, Y., Spong, D. A., Varela, J., Garcia, L., Van Zeeland, M. A., & Austin, M. E. Effects of negative triangularity shaping on energetic particle driven Alfvén eigenmodes in DIII-D. United States. https://doi.org/10.1088/1741-4326/ac2bc0
Ghai, Y., Spong, D. A., Varela, J., Garcia, L., Van Zeeland, M. A., and Austin, M. E. Tue .
"Effects of negative triangularity shaping on energetic particle driven Alfvén eigenmodes in DIII-D". United States. https://doi.org/10.1088/1741-4326/ac2bc0. https://www.osti.gov/servlets/purl/1830111.
@article{osti_1830111,
title = {Effects of negative triangularity shaping on energetic particle driven Alfvén eigenmodes in DIII-D},
author = {Ghai, Y. and Spong, D. A. and Varela, J. and Garcia, L. and Van Zeeland, M. A. and Austin, M. E.},
abstractNote = {Shape variations from positive to negative triangularity may lead to improved performance regimes in a tokamak with a reduction in microturbulence as well as improved thermal confinement. The motivation of this investigation is to model and compare the neutral beam driven Alfvén eigenmode (AE) activity in two DIII-D discharges with positive and negative triangularity shaping of plasma. The simulations are performed using the linear version of the FAR3d code, which solves the reduced MHD equations for thermal plasma with addition of moment equations for the energetic ion density and parallel velocity with appropriate Landau closure relations. Overall, our numerical results indicate that for similar physical parameters, the unstable AEs observed in the negative triangularity case have lower growth rates as compared to the positive triangularity regime. Our findings may be useful to analyze the influence of the reverse-D like geometry on the AE instabilities in DIII-D and may lead to better configurations for minimizing fast ion losses in a tokamak device.},
doi = {10.1088/1741-4326/ac2bc0},
journal = {Nuclear Fusion},
number = 12,
volume = 61,
place = {United States},
year = {2021},
month = {10}
}
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