Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model
Abstract
A reduced 1D, local, critical-gradient model of energetic particle (EP) transport by Alfvén eigenmodes (AEs)—the TGLF-EP+Alpha model—is applied to a much-studied ITER base case and variations with lower plasma current and lower current penetration. The TGLF-EP+Alpha model is a greatly reduced and computationally inexpensive model of EP transport. Such a reduced critical gradient model, while inapplicable to transport driven by strongly nonlinear or non-local abrupt events, is a valuable tool for scoping studies needed in scenario optimization for ITER and beyond. Furthermore, it relies on the assumption of critical-gradient AE transport with the critical EP density gradient determined by linear AE stability calculations in the TGLF gyro-Landau fluid code automated with the parallel-processed TGLF-EP wrapper. EP transport is treated with simultaneous drive of AEs by fusion-born alpha particles and fast ions born from a 1 MeV neutral beam injection (NBI) heating. The effect of simultaneous drive creates about 50% increased particle transport in both EP channels. High magnetic safety factor q and low shear $$\hat{s}$$ are generally destabilizing to AEs, but low shear tends to be more important. A tailored q-profile, steady-staterelevant scenario can reduce AE-induced EP redistribution by better than 25% over the ITER base case despite having half the total current.
- Authors:
-
[1];
[2]
- Univ. of California, San Diego, CA (United States). Dept. of Physics
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1597824
- Grant/Contract Number:
- SC0018108; FG02-95ER54309
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 1; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Alfvén eigenmodes; energetic particles; ITER; transport
Citation Formats
Bass, E. M., and Waltz, R. E. Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab54fb.
Bass, E. M., & Waltz, R. E. Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model. United States. https://doi.org/10.1088/1741-4326/ab54fb
Bass, E. M., and Waltz, R. E. Mon .
"Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model". United States. https://doi.org/10.1088/1741-4326/ab54fb. https://www.osti.gov/servlets/purl/1597824.
@article{osti_1597824,
title = {Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model},
author = {Bass, E. M. and Waltz, R. E.},
abstractNote = {A reduced 1D, local, critical-gradient model of energetic particle (EP) transport by Alfvén eigenmodes (AEs)—the TGLF-EP+Alpha model—is applied to a much-studied ITER base case and variations with lower plasma current and lower current penetration. The TGLF-EP+Alpha model is a greatly reduced and computationally inexpensive model of EP transport. Such a reduced critical gradient model, while inapplicable to transport driven by strongly nonlinear or non-local abrupt events, is a valuable tool for scoping studies needed in scenario optimization for ITER and beyond. Furthermore, it relies on the assumption of critical-gradient AE transport with the critical EP density gradient determined by linear AE stability calculations in the TGLF gyro-Landau fluid code automated with the parallel-processed TGLF-EP wrapper. EP transport is treated with simultaneous drive of AEs by fusion-born alpha particles and fast ions born from a 1 MeV neutral beam injection (NBI) heating. The effect of simultaneous drive creates about 50% increased particle transport in both EP channels. High magnetic safety factor q and low shear $\hat{s}$ are generally destabilizing to AEs, but low shear tends to be more important. A tailored q-profile, steady-staterelevant scenario can reduce AE-induced EP redistribution by better than 25% over the ITER base case despite having half the total current.},
doi = {10.1088/1741-4326/ab54fb},
journal = {Nuclear Fusion},
number = 1,
volume = 60,
place = {United States},
year = {2019},
month = {12}
}
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