Resolving the mystery of transport within internal transport barriers
Abstract
Here, the Trapped Gyro-Landau Fluid (TGLF) quasi-linear model, which is calibrated to nonlinear gyrokinetic turbulence simulations, is now able to predict the electron density, electron and ion temperatures and ion toroidal rotation simultaneously for internal transport barrier (ITB) discharges. This is a strong validation of gyrokinetic theory of ITBs, requiring multiple instabilities responsible for transport in different channels at different scales. The mystery of transport inside the ITB is that momentum and particle transport is far above the predicted neoclassical levels in apparent contradiction with the expectation from the theory of suppression of turbulence by E × B velocity shear. The success of TGLF in predicting ITB transport is due to the inclusion of ion gyro-radius scale modes that become dominant at high E × B velocity shear and to improvements to TGLF that allow momentum transport from gyrokinetic turbulence to be faithfully modeled.
- Authors:
-
- General Atomics, San Diego, CA (United States)
- CompX, Del Mar, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of California, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1354825
- Grant/Contract Number:
- FC02-04ER54698; FG02-95ER54309; FG03-99ER54541; FG02-07ER54917; AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Staebler, Gary M., Kinsey, Jon E., Belli, Emily A., Candy, Jefferey, Waltz, Ronald E., Greenfield, Charles M., Lao, Lang L., Smith, Sterling P., Grierson, Brain A., and Chrystal, Colin. Resolving the mystery of transport within internal transport barriers. United States: N. p., 2014.
Web. doi:10.1063/1.4875334.
Staebler, Gary M., Kinsey, Jon E., Belli, Emily A., Candy, Jefferey, Waltz, Ronald E., Greenfield, Charles M., Lao, Lang L., Smith, Sterling P., Grierson, Brain A., & Chrystal, Colin. Resolving the mystery of transport within internal transport barriers. United States. https://doi.org/10.1063/1.4875334
Staebler, Gary M., Kinsey, Jon E., Belli, Emily A., Candy, Jefferey, Waltz, Ronald E., Greenfield, Charles M., Lao, Lang L., Smith, Sterling P., Grierson, Brain A., and Chrystal, Colin. Fri .
"Resolving the mystery of transport within internal transport barriers". United States. https://doi.org/10.1063/1.4875334. https://www.osti.gov/servlets/purl/1354825.
@article{osti_1354825,
title = {Resolving the mystery of transport within internal transport barriers},
author = {Staebler, Gary M. and Kinsey, Jon E. and Belli, Emily A. and Candy, Jefferey and Waltz, Ronald E. and Greenfield, Charles M. and Lao, Lang L. and Smith, Sterling P. and Grierson, Brain A. and Chrystal, Colin},
abstractNote = {Here, the Trapped Gyro-Landau Fluid (TGLF) quasi-linear model, which is calibrated to nonlinear gyrokinetic turbulence simulations, is now able to predict the electron density, electron and ion temperatures and ion toroidal rotation simultaneously for internal transport barrier (ITB) discharges. This is a strong validation of gyrokinetic theory of ITBs, requiring multiple instabilities responsible for transport in different channels at different scales. The mystery of transport inside the ITB is that momentum and particle transport is far above the predicted neoclassical levels in apparent contradiction with the expectation from the theory of suppression of turbulence by E × B velocity shear. The success of TGLF in predicting ITB transport is due to the inclusion of ion gyro-radius scale modes that become dominant at high E × B velocity shear and to improvements to TGLF that allow momentum transport from gyrokinetic turbulence to be faithfully modeled.},
doi = {10.1063/1.4875334},
journal = {Physics of Plasmas},
number = 5,
volume = 21,
place = {United States},
year = {Fri May 02 00:00:00 EDT 2014},
month = {Fri May 02 00:00:00 EDT 2014}
}
Web of Science
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Works referencing / citing this record:
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