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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. 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];  [2]; ; ;  [3]; ; ;  [1]
  1. Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688 (United States)
  2. (United States)
  3. University of California, Irvine, California 92697 (United States)
Publication Date:
OSTI Identifier:
22600240
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Other Information: (c) 2016 Author(s); 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; BACKSCATTERING; BEAMS; FIELD-REVERSED THETA PINCH DEVICES; FLUCTUATIONS; GEOMETRY; INSTABILITY; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA CONFINEMENT; PLASMA SCRAPE-OFF LAYER; PRESSURE GRADIENTS; SIMULATION; STABILITY; THERMONUCLEAR REACTORS; TRANSPORT THEORY

Citation Formats

Fulton, D. P., E-mail: dfulton@trialphaenergy.com, University of California, Irvine, California 92697, Lau, C. K., Holod, I., Lin, Z., Schmitz, L., 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., E-mail: dfulton@trialphaenergy.com, University of California, Irvine, California 92697, Lau, C. K., Holod, I., Lin, Z., Schmitz, L., Tajima, T., & Binderbauer, M. W.. Gyrokinetic simulation of driftwave instability in field-reversed configuration. United States. doi:10.1063/1.4948285.
Fulton, D. P., E-mail: dfulton@trialphaenergy.com, University of California, Irvine, California 92697, Lau, C. K., Holod, I., Lin, Z., Schmitz, L., Tajima, T., and Binderbauer, M. W.. Sun . "Gyrokinetic simulation of driftwave instability in field-reversed configuration". United States. doi:10.1063/1.4948285.
@article{osti_22600240,
title = {Gyrokinetic simulation of driftwave instability in field-reversed configuration},
author = {Fulton, D. P., E-mail: dfulton@trialphaenergy.com and University of California, Irvine, California 92697 and Lau, C. K. and Holod, I. and Lin, Z. and Schmitz, L. 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. 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},
issn = {1070-664X},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}