Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations
Abstract
Time-dependent integrated simulations through codes such as TRANSP are becoming an indispensable tool for the interpretation of existing experiments and predictions of optimized scenarios. For many practical cases, quantitative simulations need to include the effect of plasma instabilities on the evolution of a tokamak discharge. An example is the degradation in energetic particle (EP) confinement induced by instabilities, which in turn affects important source terms for heating, non-inductive current, and momentum in a simulation. The reduced-physics "kick model" provides phase-space resolved transport probability matrices to TRANSP that are used to account for enhanced EP transport by instabilities in addition to neoclassical transport. The model has recovered the measured Alfvén eigenmode (AE) spectrum on NSTX, NSTX-U and DIII-D, and has reproduced details of phase-space resolved fast ion diagnostic data measured on DIII-D for EP-driven modes and tearing modes. In general, the kick model has proven the potential of phase-space resolved EP simulations to unravel details of EP transport for detailed theory/experiment comparison and for scenario planning based on optimization of Neutral Beam (NB) injection parameters. In this work, the extension of the kick model to low-frequency instabilities such as Tearing Modes and fishbones, in addition to AEs, is assessed. The goalmore »
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
- General Atomics, San Diego, CA (United States)
- Univ. of California, Irvine, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1543445
- Grant/Contract Number:
- AC02-09CH11466; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 10; 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, Mario, Bardoczi, Laszlo, Collins, Cami, Gorelenkov, Nikolai N., Heidbrink, William W., Duarte, Vinicius N., Kramer, Gerrit J., Fredrickson, Eric D., Gorelenkova, Marina, Kim, Doohyun, Liu, Deyong, Poli, Francesca M., Van Zeeland, Michael A., and White, Roscoe B. Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab3112.
Podesta, Mario, Bardoczi, Laszlo, Collins, Cami, Gorelenkov, Nikolai N., Heidbrink, William W., Duarte, Vinicius N., Kramer, Gerrit J., Fredrickson, Eric D., Gorelenkova, Marina, Kim, Doohyun, Liu, Deyong, Poli, Francesca M., Van Zeeland, Michael A., & White, Roscoe B. Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations. United States. https://doi.org/10.1088/1741-4326/ab3112
Podesta, Mario, Bardoczi, Laszlo, Collins, Cami, Gorelenkov, Nikolai N., Heidbrink, William W., Duarte, Vinicius N., Kramer, Gerrit J., Fredrickson, Eric D., Gorelenkova, Marina, Kim, Doohyun, Liu, Deyong, Poli, Francesca M., Van Zeeland, Michael A., and White, Roscoe B. Thu .
"Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations". United States. https://doi.org/10.1088/1741-4326/ab3112. https://www.osti.gov/servlets/purl/1543445.
@article{osti_1543445,
title = {Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations},
author = {Podesta, Mario and Bardoczi, Laszlo and Collins, Cami and Gorelenkov, Nikolai N. and Heidbrink, William W. and Duarte, Vinicius N. and Kramer, Gerrit J. and Fredrickson, Eric D. and Gorelenkova, Marina and Kim, Doohyun and Liu, Deyong and Poli, Francesca M. and Van Zeeland, Michael A. and White, Roscoe B.},
abstractNote = {Time-dependent integrated simulations through codes such as TRANSP are becoming an indispensable tool for the interpretation of existing experiments and predictions of optimized scenarios. For many practical cases, quantitative simulations need to include the effect of plasma instabilities on the evolution of a tokamak discharge. An example is the degradation in energetic particle (EP) confinement induced by instabilities, which in turn affects important source terms for heating, non-inductive current, and momentum in a simulation. The reduced-physics "kick model" provides phase-space resolved transport probability matrices to TRANSP that are used to account for enhanced EP transport by instabilities in addition to neoclassical transport. The model has recovered the measured Alfvén eigenmode (AE) spectrum on NSTX, NSTX-U and DIII-D, and has reproduced details of phase-space resolved fast ion diagnostic data measured on DIII-D for EP-driven modes and tearing modes. In general, the kick model has proven the potential of phase-space resolved EP simulations to unravel details of EP transport for detailed theory/experiment comparison and for scenario planning based on optimization of Neutral Beam (NB) injection parameters. In this work, the extension of the kick model to low-frequency instabilities such as Tearing Modes and fishbones, in addition to AEs, is assessed. The goal is to enable TRANSP simulations that retain the main effects of multiple types of instabilities through a common framework. Results from the NSTX/NSTX-U and DIII-D tokamaks show that the extension to "multi-mode" scenarios can expand the range of applicability of the model for more reliable, quantitative integrated simulations.},
doi = {10.1088/1741-4326/ab3112},
journal = {Nuclear Fusion},
number = 10,
volume = 59,
place = {United States},
year = {Thu Jul 11 00:00:00 EDT 2019},
month = {Thu Jul 11 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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