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Title: Gyrokinetic simulation of driftwave instability in field-reversed configuration

Abstract

Following the recent remarkable progress in magnetohydrodynamic (MHD) stability control in the C-2U advanced beam driven field-reversed configuration (FRC), turbulent transport has become one of the foremost obstacles on the path towards an FRC-based fusion reactor. Significant effort has been made to expand kinetic simulation capabilities in FRC magnetic geometry. Here, the recently upgraded Gyrokinetic Toroidal Code (GTC) now accommodates realistic magnetic geometry from the C-2U experiment at Tri Alpha Energy, Inc. and is optimized to efficiently handle the FRC's magnetic field line orientation. Initial electrostatic GTC simulations find that ion-scale instabilities are linearly stable in the FRC core for realistic pressure gradient drives. Estimated instability thresholds from linear GTC simulations are qualitatively consistent with critical gradients determined from experimental Doppler backscattering fluctuation data, which also find ion scale modes to be depressed in the FRC core. Beyond GTC, A New Code (ANC) has been developed to accurately resolve the magnetic field separatrix and address the interaction between the core and scrape-off layer regions, which ultimately determines global plasma confinement in the FRC. The current status of ANC and future development targets are discussed.

Authors:
 [1]; ORCiD logo [2];  [3];  [2]; ORCiD logo [2];  [3]; ORCiD logo [3]
  1. Tri Alpha Energy, Inc., Rancho Santa Margarita, CA (United States); Univ. of California, Irvine, CA (United States)
  2. Univ. of California, Irvine, CA (United States)
  3. Tri Alpha Energy, Inc., Rancho Santa Margarita, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
TAE Team
OSTI Identifier:
1565473
Alternate Identifier(s):
OSTI ID: 1250974
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; 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; Physics

Citation Formats

Fulton, D. P., Lau, C. K., Schmitz, L., Holod, I., Lin, Z., Tajima, T., and Binderbauer, M. W. Gyrokinetic simulation of driftwave instability in field-reversed configuration. United States: N. p., 2016. Web. doi:10.1063/1.4948285.
Fulton, D. P., Lau, C. K., Schmitz, L., Holod, I., Lin, Z., Tajima, T., & Binderbauer, M. W. Gyrokinetic simulation of driftwave instability in field-reversed configuration. United States. doi:10.1063/1.4948285.
Fulton, D. P., Lau, C. K., Schmitz, L., Holod, I., Lin, Z., Tajima, T., and Binderbauer, M. W. Wed . "Gyrokinetic simulation of driftwave instability in field-reversed configuration". United States. doi:10.1063/1.4948285. https://www.osti.gov/servlets/purl/1565473.
@article{osti_1565473,
title = {Gyrokinetic simulation of driftwave instability in field-reversed configuration},
author = {Fulton, D. P. and Lau, C. K. and Schmitz, L. and Holod, I. and Lin, Z. and Tajima, T. and Binderbauer, M. W.},
abstractNote = {Following the recent remarkable progress in magnetohydrodynamic (MHD) stability control in the C-2U advanced beam driven field-reversed configuration (FRC), turbulent transport has become one of the foremost obstacles on the path towards an FRC-based fusion reactor. Significant effort has been made to expand kinetic simulation capabilities in FRC magnetic geometry. Here, the recently upgraded Gyrokinetic Toroidal Code (GTC) now accommodates realistic magnetic geometry from the C-2U experiment at Tri Alpha Energy, Inc. and is optimized to efficiently handle the FRC's magnetic field line orientation. Initial electrostatic GTC simulations find that ion-scale instabilities are linearly stable in the FRC core for realistic pressure gradient drives. Estimated instability thresholds from linear GTC simulations are qualitatively consistent with critical gradients determined from experimental Doppler backscattering fluctuation data, which also find ion scale modes to be depressed in the FRC core. Beyond GTC, A New Code (ANC) has been developed to accurately resolve the magnetic field separatrix and address the interaction between the core and scrape-off layer regions, which ultimately determines global plasma confinement in the FRC. The current status of ANC and future development targets are discussed.},
doi = {10.1063/1.4948285},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}

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