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Title: Numerical study of the current-convective instability driven by asymmetry of detachment in inner and outer divertors

Abstract

One of the possible mechanisms responsible for strong radiation fluctuations observed in recent experiments with detached plasmas at ASDEX Upgrade [Potzel et al., Nucl. Fusion 54, 013001 (2014)] can be related to the onset of the current-convective instability (CCI) driven by strong asymmetry of detachment in the inner and outer divertors of the tokamak [S. Krasheninnikov and A. Smolyakov, Phys. Plasmas 23, 092505 (2016)]. Here in this study, we present the physical model, used to simulate the CCI, and the first numerical results of modeling of the CCI dynamics in ASDEX Upgrade-like conditions. The simulation results provide frequency spectra of turbulent divertor plasma oscillations showing reasonably good agreement with the available experimental data.

Authors:
ORCiD logo [1];  [2]
  1. National Research Nuclear Univ., Moscow (Russia). Moscow Engineering Physics Inst. (MEPhI)
  2. National Research Nuclear Univ., Moscow (Russia). Moscow Engineering Physics Inst. (MEPhI); Univ. of California, San Diego, CA (United States). Dept. of Mechanical and Aerospace Engineering
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1524559
Alternate Identifier(s):
OSTI ID: 1415666
Grant/Contract Number:  
FG02-04ER54739
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; 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

Stepanenko, A. A., and Krasheninnikov, S. I. Numerical study of the current-convective instability driven by asymmetry of detachment in inner and outer divertors. United States: N. p., 2018. Web. doi:10.1063/1.5010932.
Stepanenko, A. A., & Krasheninnikov, S. I. Numerical study of the current-convective instability driven by asymmetry of detachment in inner and outer divertors. United States. doi:10.1063/1.5010932.
Stepanenko, A. A., and Krasheninnikov, S. I. Thu . "Numerical study of the current-convective instability driven by asymmetry of detachment in inner and outer divertors". United States. doi:10.1063/1.5010932. https://www.osti.gov/servlets/purl/1524559.
@article{osti_1524559,
title = {Numerical study of the current-convective instability driven by asymmetry of detachment in inner and outer divertors},
author = {Stepanenko, A. A. and Krasheninnikov, S. I.},
abstractNote = {One of the possible mechanisms responsible for strong radiation fluctuations observed in recent experiments with detached plasmas at ASDEX Upgrade [Potzel et al., Nucl. Fusion 54, 013001 (2014)] can be related to the onset of the current-convective instability (CCI) driven by strong asymmetry of detachment in the inner and outer divertors of the tokamak [S. Krasheninnikov and A. Smolyakov, Phys. Plasmas 23, 092505 (2016)]. Here in this study, we present the physical model, used to simulate the CCI, and the first numerical results of modeling of the CCI dynamics in ASDEX Upgrade-like conditions. The simulation results provide frequency spectra of turbulent divertor plasma oscillations showing reasonably good agreement with the available experimental data.},
doi = {10.1063/1.5010932},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Snapshots of the electron temperature longitudinal (A) and transverse (B–D) profiles obtained for T̂e = 11 eV. The slice A is taken at z = Δ/2. The slices B, C, and D are taken at y = L||, y = (2/3)L||, and y = L||/3, respectively.

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Works referenced in this record:

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