Effects of MHD instabilities on neutral beam current drive
Abstract
One of the primary tools foreseen for heating, current drive (CD) and q-profile control in future fusion reactors such as ITER and a Fusion Nuclear Science Facility is the neutral beam injection (NBI). However, fast ions from NBI may also provide the drive for energetic particle-driven instabilities (e.g. Alfvénic modes (AEs)), which in turn redistribute fast ions in both space and energy, thus hampering the control capabilities and overall efficiency of NB-driven current. Based on experiments on the NSTX tokamak (M. Ono et al 2000 Nucl. Fusion 40 557), the effects of AEs and other low-frequency magneto-hydrodynamic instabilities on NB-CD efficiency are investigated. When looking at the new fast ion transport model, which accounts for particle transport in phase space as required for resonant AE perturbations, is utilized to obtain consistent simulations of NB-CD through the tokamak transport code TRANSP. It is found that instabilities do indeed reduce the NB-driven current density over most of the plasma radius by up to ~50%. Moreover, the details of the current profile evolution are sensitive to the specific model used to mimic the interaction between NB ions and instabilities. Finally, implications for fast ion transport modeling in integrated tokamak simulations are briefly discussed.
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1257708
- Report Number(s):
- PPPL-5094
Journal ID: ISSN 0029-5515
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 55; Journal Issue: 5; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Podestà, M., Gorelenkova, M., Darrow, D. S., Fredrickson, E. D., Gerhardt, S. P., and White, R. B. Effects of MHD instabilities on neutral beam current drive. United States: N. p., 2015.
Web. doi:10.1088/0029-5515/55/5/053018.
Podestà, M., Gorelenkova, M., Darrow, D. S., Fredrickson, E. D., Gerhardt, S. P., & White, R. B. Effects of MHD instabilities on neutral beam current drive. United States. https://doi.org/10.1088/0029-5515/55/5/053018
Podestà, M., Gorelenkova, M., Darrow, D. S., Fredrickson, E. D., Gerhardt, S. P., and White, R. B. Fri .
"Effects of MHD instabilities on neutral beam current drive". United States. https://doi.org/10.1088/0029-5515/55/5/053018. https://www.osti.gov/servlets/purl/1257708.
@article{osti_1257708,
title = {Effects of MHD instabilities on neutral beam current drive},
author = {Podestà, M. and Gorelenkova, M. and Darrow, D. S. and Fredrickson, E. D. and Gerhardt, S. P. and White, R. B.},
abstractNote = {One of the primary tools foreseen for heating, current drive (CD) and q-profile control in future fusion reactors such as ITER and a Fusion Nuclear Science Facility is the neutral beam injection (NBI). However, fast ions from NBI may also provide the drive for energetic particle-driven instabilities (e.g. Alfvénic modes (AEs)), which in turn redistribute fast ions in both space and energy, thus hampering the control capabilities and overall efficiency of NB-driven current. Based on experiments on the NSTX tokamak (M. Ono et al 2000 Nucl. Fusion 40 557), the effects of AEs and other low-frequency magneto-hydrodynamic instabilities on NB-CD efficiency are investigated. When looking at the new fast ion transport model, which accounts for particle transport in phase space as required for resonant AE perturbations, is utilized to obtain consistent simulations of NB-CD through the tokamak transport code TRANSP. It is found that instabilities do indeed reduce the NB-driven current density over most of the plasma radius by up to ~50%. Moreover, the details of the current profile evolution are sensitive to the specific model used to mimic the interaction between NB ions and instabilities. Finally, implications for fast ion transport modeling in integrated tokamak simulations are briefly discussed.},
doi = {10.1088/0029-5515/55/5/053018},
journal = {Nuclear Fusion},
number = 5,
volume = 55,
place = {United States},
year = {Fri Apr 17 00:00:00 EDT 2015},
month = {Fri Apr 17 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
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