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Title: The first transport code simulations using the trapped gyro-Landau-fluid model

Abstract

The first transport code simulations using the newly developed trapped gyro-Landau-fluid (TGLF) theory-based transport model are presented. TGLF has comprehensive physics to approximate the turbulent transport due to drift-ballooning modes in tokamaks. The TGLF model is a next generation gyro-Landau-fluid model that improves the accuracy of the trapped particle response and the finite Larmor radius effects compared to its predecessor, GLF23. The model solves for the linear eigenmodes of trapped ion and electron modes, ion and electron temperature gradient modes, and electromagnetic kinetic ballooning modes in either shifted circle or shaped geometry. A database of over 400 nonlinear gyrokinetic simulations using the GYRO code has been created. A subset of 83 simulations with shaped geometry has been used to find a model for the saturation levels. Using a simple quasilinear (QL) saturation rule, remarkable agreement with the energy and particle fluxes from a wide variety of GYRO simulations is found for both shaped or circular geometry and also for low aspect ratio. Using this new QL saturation rule along with a new ExB shear quench rule for shaped geometry, the density and temperature profiles have been predicted in over 500 transport code runs and the results compared against experimental datamore » from 96 tokamak discharges. Compared to GLF23, the TGLF model demonstrates better agreement between the predicted and experimental temperature profiles. Surprisingly, TGLF predicts that the high-k modes are found to play an important role in the central core region of low and high confinement plasmas lacking transport barriers.« less

Authors:
; ;  [1]
  1. General Atomics, P.O. Box 85608, San Diego, California 92186 (United States)
Publication Date:
OSTI Identifier:
21120352
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 15; Journal Issue: 5; Other Information: DOI: 10.1063/1.2889008; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BALLOONING INSTABILITY; ELECTRIC DISCHARGES; ELECTROMAGNETIC FIELDS; ELECTRON TEMPERATURE; GEOMETRY; LARMOR RADIUS; PLASMA; PLASMA CONFINEMENT; PLASMA SIMULATION; TEMPERATURE GRADIENTS; TOKAMAK DEVICES; TRANSPORT THEORY; TRAPPING

Citation Formats

Kinsey, J E, Staebler, G M, and Waltz, R E. The first transport code simulations using the trapped gyro-Landau-fluid model. United States: N. p., 2008. Web. doi:10.1063/1.2889008.
Kinsey, J E, Staebler, G M, & Waltz, R E. The first transport code simulations using the trapped gyro-Landau-fluid model. United States. doi:10.1063/1.2889008.
Kinsey, J E, Staebler, G M, and Waltz, R E. Thu . "The first transport code simulations using the trapped gyro-Landau-fluid model". United States. doi:10.1063/1.2889008.
@article{osti_21120352,
title = {The first transport code simulations using the trapped gyro-Landau-fluid model},
author = {Kinsey, J E and Staebler, G M and Waltz, R E},
abstractNote = {The first transport code simulations using the newly developed trapped gyro-Landau-fluid (TGLF) theory-based transport model are presented. TGLF has comprehensive physics to approximate the turbulent transport due to drift-ballooning modes in tokamaks. The TGLF model is a next generation gyro-Landau-fluid model that improves the accuracy of the trapped particle response and the finite Larmor radius effects compared to its predecessor, GLF23. The model solves for the linear eigenmodes of trapped ion and electron modes, ion and electron temperature gradient modes, and electromagnetic kinetic ballooning modes in either shifted circle or shaped geometry. A database of over 400 nonlinear gyrokinetic simulations using the GYRO code has been created. A subset of 83 simulations with shaped geometry has been used to find a model for the saturation levels. Using a simple quasilinear (QL) saturation rule, remarkable agreement with the energy and particle fluxes from a wide variety of GYRO simulations is found for both shaped or circular geometry and also for low aspect ratio. Using this new QL saturation rule along with a new ExB shear quench rule for shaped geometry, the density and temperature profiles have been predicted in over 500 transport code runs and the results compared against experimental data from 96 tokamak discharges. Compared to GLF23, the TGLF model demonstrates better agreement between the predicted and experimental temperature profiles. Surprisingly, TGLF predicts that the high-k modes are found to play an important role in the central core region of low and high confinement plasmas lacking transport barriers.},
doi = {10.1063/1.2889008},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 15,
place = {United States},
year = {2008},
month = {5}
}