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:
-
- 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}
}
Works referenced in this record:
Gyrokinetic simulations of impurity, He ash and α particle transport and consequences on ITER transport modelling
journal, April 2009
- Angioni, C.; Peeters, A. G.; Pereverzev, G. V.
- Nuclear Fusion, Vol. 49, Issue 5
Nonlinear Dynamics of a Driven Mode near Marginal Stability
journal, February 1996
- Berk, H. L.; Breizman, B. N.; Pekker, M.
- Physical Review Letters, Vol. 76, Issue 8
Density limits in toroidal plasmas
journal, July 2002
- Greenwald, Martin
- Plasma Physics and Controlled Fusion, Vol. 44, Issue 8
Alfvén eigenmode stability and critical gradient energetic particle transport using the Trapped-Gyro-Landau-Fluid model
journal, July 2017
- Sheng, He; Waltz, R. E.; Staebler, G. M.
- Physics of Plasmas, Vol. 24, Issue 7
Prediction of the fusion alpha density profile in ITER from local marginal stability to Alfvén eigenmodes
journal, October 2014
- Waltz, R. E.; Bass, E. M.
- Nuclear Fusion, Vol. 54, Issue 10
Development and validation of a critical gradient energetic particle driven Alfven eigenmode transport model for DIII-D tilted neutral beam experiments
journal, October 2015
- Waltz, R. E.; Bass, E. M.; Heidbrink, W. W.
- Nuclear Fusion, Vol. 55, Issue 12
Gyrokinetic simulation of global and local Alfvén eigenmodes driven by energetic particles in a DIII-D discharge
journal, January 2013
- Bass, E. M.; Waltz, R. E.
- Physics of Plasmas, Vol. 20, Issue 1
Energetic particle physics in fusion research in preparation for burning plasma experiments
journal, November 2014
- Gorelenkov, N. N.; Pinches, S. D.; Toi, K.
- Nuclear Fusion, Vol. 54, Issue 12
Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes
journal, July 1994
- Waltz, R. E.; Kerbel, G. D.; Milovich, J.
- Physics of Plasmas, Vol. 1, Issue 7
1.5D quasilinear model and its application on beams interacting with Alfvén eigenmodes in DIII-D
journal, September 2012
- Ghantous, K.; Gorelenkov, N. N.; Berk, H. L.
- Physics of Plasmas, Vol. 19, Issue 9
Energetic ion distribution resulting from neutral beam injection in tokamaks
journal, October 1976
- Gaffey, John D.
- Journal of Plasma Physics, Vol. 16, Issue 2
Kinetic transport simulation of energetic particles
journal, April 2016
- Sheng, He; Waltz, R. E.
- Nuclear Fusion, Vol. 56, Issue 5
Simulations tackle abrupt massive migrations of energetic beam ions in a tokamak plasma
journal, August 2018
- Bierwage, Andreas; Shinohara, Kouji; Todo, Yasushi
- Nature Communications, Vol. 9, Issue 1
ITER predictions using the GYRO verified and experimentally validated trapped gyro-Landau fluid transport model
journal, June 2011
- Kinsey, J. E.; Staebler, G. M.; Candy, J.
- Nuclear Fusion, Vol. 51, Issue 8
Anomalous Transport Scaling in the DIII-D Tokamak Matched by Supercomputer Simulation
journal, July 2003
- Candy, J.; Waltz, R. E.
- Physical Review Letters, Vol. 91, Issue 4
Observation of Critical-Gradient Behavior in Alfvén-Eigenmode-Induced Fast-Ion Transport
journal, February 2016
- Collins, C. S.; Heidbrink, W. W.; Austin, M. E.
- Physical Review Letters, Vol. 116, Issue 9
Gyrokinetic simulations of mesoscale energetic particle-driven Alfvénic turbulent transport embedded in microturbulence
journal, November 2010
- Bass, E. M.; Waltz, R. E.
- Physics of Plasmas, Vol. 17, Issue 11
Development and validation of a predictive model for the pedestal height
journal, May 2009
- Snyder, P. B.; Groebner, R. J.; Leonard, A. W.
- Physics of Plasmas, Vol. 16, Issue 5
Enhanced Localized Energetic-Ion Losses Resulting from Single-Pass Interactions with Alfvén Eigenmodes
journal, February 2013
- Chen, X.; Austin, M. E.; Fisher, R. K.
- Physical Review Letters, Vol. 110, Issue 6
A theory-based transport model with comprehensive physics
journal, May 2007
- Staebler, G. M.; Kinsey, J. E.; Waltz, R. E.
- Physics of Plasmas, Vol. 14, Issue 5
Turbulent transport of alpha particles in reactor plasmas
journal, November 2006
- Estrada-Mila, C.; Candy, J.; Waltz, R. E.
- Physics of Plasmas, Vol. 13, Issue 11
Test-electron analysis of the magnetic reconnection topology
journal, December 2017
- Borgogno, D.; Perona, A.; Grasso, D.
- Physics of Plasmas, Vol. 24, Issue 12
The effect of the fast-ion profile on Alfvén eigenmode stability
journal, August 2013
- Heidbrink, W. W.; Van Zeeland, M. A.; Austin, M. E.
- Nuclear Fusion, Vol. 53, Issue 9
Multi-phase hybrid simulation of energetic particle driven magnetohydrodynamic instabilities in tokamak plasmas
journal, November 2016
- Todo, Y.
- New Journal of Physics, Vol. 18, Issue 11