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Title: Cross-separatrix simulations of turbulent transport in the field-reversed configuration

Abstract

Recent local simulations of the field-reversed configuration (FRC) have reported drift-wave stability in the core and instability in the scrape-off layer (SOL). However, experimental measurements indicate the existence of fluctuations in both FRC core and SOL, with much lower amplitude fluctuations measured in the core. With the updated cross-separatrix capabilities of the simulation code used in this paper, nonlinear turbulence simulations find that linear instabilities grow in the SOL, generating fluctuations which spread from SOL to core. After saturation of the linear instabilities, a balance of the inward spread and local damping in the core is achieved. The steady state toroidal wavenumber spectrum shows lower amplitude core fluctuations and larger SOL fluctuations with amplitude decreasing towards shorter wavelengths, which are consistent with experimental measurements.

Authors:
ORCiD logo [1];  [1];  [2];  [2];  [3];  [4];  [1]
  1. TAE Technologies, Foothill Ranch, CA (United States)
  2. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  3. TAE Technologies, Foothill Ranch, CA (United States); Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  4. TAE Technologies, Foothill Ranch, CA (United States); Univ. of Southern California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
the TAE Team
OSTI Identifier:
1527014
DOE Contract Number:  
AC02-05CH11231; AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 6; Journal ID: ISSN 0029-5515
Country of Publication:
United States
Language:
English

Citation Formats

Lau, C. K., Fulton, D. P., Bao, J., Lin, Z., Tajima, T., Schmitz, L., and Dettrick, S. Cross-separatrix simulations of turbulent transport in the field-reversed configuration. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab1578.
Lau, C. K., Fulton, D. P., Bao, J., Lin, Z., Tajima, T., Schmitz, L., & Dettrick, S. Cross-separatrix simulations of turbulent transport in the field-reversed configuration. United States. doi:10.1088/1741-4326/ab1578.
Lau, C. K., Fulton, D. P., Bao, J., Lin, Z., Tajima, T., Schmitz, L., and Dettrick, S. Thu . "Cross-separatrix simulations of turbulent transport in the field-reversed configuration". United States. doi:10.1088/1741-4326/ab1578.
@article{osti_1527014,
title = {Cross-separatrix simulations of turbulent transport in the field-reversed configuration},
author = {Lau, C. K. and Fulton, D. P. and Bao, J. and Lin, Z. and Tajima, T. and Schmitz, L. and Dettrick, S.},
abstractNote = {Recent local simulations of the field-reversed configuration (FRC) have reported drift-wave stability in the core and instability in the scrape-off layer (SOL). However, experimental measurements indicate the existence of fluctuations in both FRC core and SOL, with much lower amplitude fluctuations measured in the core. With the updated cross-separatrix capabilities of the simulation code used in this paper, nonlinear turbulence simulations find that linear instabilities grow in the SOL, generating fluctuations which spread from SOL to core. After saturation of the linear instabilities, a balance of the inward spread and local damping in the core is achieved. The steady state toroidal wavenumber spectrum shows lower amplitude core fluctuations and larger SOL fluctuations with amplitude decreasing towards shorter wavelengths, which are consistent with experimental measurements.},
doi = {10.1088/1741-4326/ab1578},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 6,
volume = 59,
place = {United States},
year = {2019},
month = {5}
}