Effects of energetic particle phase space modifications by instabilities on integrated modeling
Abstract
Tokamak plasmas can feature a large population of energetic particles (EP) from neutral beam injection or fusion reactions. In turn, energetic particles can drive instabilities, which affect the driving EP population leading to a distortion of the original EP distribution function and of quantities that depend on it. The latter include, for example, neutral beam (NB) current drive and plasma heating through EP thermalization. Those effects must be taken into account to enable reliable and quantitative simulations of discharges for present devices as well as predictions for future burning plasmas. Reduced models for EP transport are emerging as an effective tool for long time-scale integrated simulations of tokamak plasmas, possibly including the effects of instabilities on EP dynamics. Available models differ in how EP distribution properties are modified by instabilities, e.g. in terms of gradients in real or phase space. It is therefore crucial to assess to what extent different assumptions in the transport models affect predicted quantities such as EP profile, energy distribution, NB driven current and energy/momentum transfer to the thermal populations. A newly developed kick model, which includes modifications of the EP distribution by instabilities in both real and velocity space, is used in this work tomore »
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Contributing Org.:
- Princeton Plasma Physics Laboratory, Princeton NJ 08543 - USA
- OSTI Identifier:
- 1346925
- Alternate Identifier(s):
- OSTI ID: 1267536; OSTI ID: 1347147; OSTI ID: 1371851
- Grant/Contract Number:
- AC02-09CH11466; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 11; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Podesta, M., Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., and White, R. B. Effects of energetic particle phase space modifications by instabilities on integrated modeling. United States: N. p., 2016.
Web. doi:10.1088/0029-5515/56/11/112005.
Podesta, M., Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., & White, R. B. Effects of energetic particle phase space modifications by instabilities on integrated modeling. United States. https://doi.org/10.1088/0029-5515/56/11/112005
Podesta, M., Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., and White, R. B. Fri .
"Effects of energetic particle phase space modifications by instabilities on integrated modeling". United States. https://doi.org/10.1088/0029-5515/56/11/112005. https://www.osti.gov/servlets/purl/1346925.
@article{osti_1346925,
title = {Effects of energetic particle phase space modifications by instabilities on integrated modeling},
author = {Podesta, M. and Gorelenkova, M. and Fredrickson, E. D. and Gorelenkov, N. N. and White, R. B.},
abstractNote = {Tokamak plasmas can feature a large population of energetic particles (EP) from neutral beam injection or fusion reactions. In turn, energetic particles can drive instabilities, which affect the driving EP population leading to a distortion of the original EP distribution function and of quantities that depend on it. The latter include, for example, neutral beam (NB) current drive and plasma heating through EP thermalization. Those effects must be taken into account to enable reliable and quantitative simulations of discharges for present devices as well as predictions for future burning plasmas. Reduced models for EP transport are emerging as an effective tool for long time-scale integrated simulations of tokamak plasmas, possibly including the effects of instabilities on EP dynamics. Available models differ in how EP distribution properties are modified by instabilities, e.g. in terms of gradients in real or phase space. It is therefore crucial to assess to what extent different assumptions in the transport models affect predicted quantities such as EP profile, energy distribution, NB driven current and energy/momentum transfer to the thermal populations. A newly developed kick model, which includes modifications of the EP distribution by instabilities in both real and velocity space, is used in this work to investigate these issues. Coupled to TRANSP simulations, the kick model is used to analyze NB-heated NSTX and DIII-D discharges featuring unstable Alfven eigenmodes (AEs). Results show that instabilities can strongly affect the EP distribution function, and modifications propagate to macroscopic quantities such as NB-driven current profile and NB power transferred to the thermal plasma species. Those important aspects are only qualitatively captured by simpler fast ion transport models that are based on radial diffusion of energetic ions only.},
doi = {10.1088/0029-5515/56/11/112005},
journal = {Nuclear Fusion},
number = 11,
volume = 56,
place = {United States},
year = {Fri Jul 22 00:00:00 EDT 2016},
month = {Fri Jul 22 00:00:00 EDT 2016}
}
Web of Science
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Works referencing / citing this record:
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