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Title: Anomalous transport in the H-mode pedestal of Alcator C-Mod discharges

Abstract

Anomalous transport in the H-mode pedestal region of five Alcator C-Mod discharges, representing a collisionality scan is analyzed. The understanding of anomalous transport in the pedestal region is important for the development of a comprehensive model for the H-mode pedestal slope. In this research, a possible role of the drift resistive inertial ballooning modes (Rafiq et al 2010 Phys. Plasmas 17 082511) in the edge of Alcator C-Mod discharges is analyzed. The stability analysis, carried out using the TRANSP code, indicates that the DRIBM modes are strongly unstable in Alcator C-Mod discharges with large electron collisionality. An improved interpretive analysis of H-mode pedestal experimental data is carried out utilizing the additive flux minimization technique (Pankin et al 2013 Phys. Plasmas 20 102501) together with the guiding-center neoclassical kinetic XGC0 code. The neoclassical and neutral physics are simulated in the XGC0 code and the anomalous fluxes are computed using the additive flux minimization technique. The anomalous fluxes are reconstructed and compared with each other for the collisionality scan Alcator C-Mod discharges. It is found that the electron thermal anomalous diffusivities at the pedestal top increase with the electron collisionality. This dependence can also point to the drift resistive inertial ballooning modesmore » as the modes that drive the anomalous transport in the plasma edge of highly collisional discharges.« less

Authors:
 [1];  [2];  [2];  [3];  [3]
+ Show Author Affiliations
  1. Tech-X Corporation, Boulder, CO (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  3. Lehigh Univ., Bethlehem, PA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Lehigh Univ., Bethlehem, PA (United States); Tech-X Corporation, Boulder, CO (United States); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1535439
Alternate Identifier(s):
OSTI ID: 1327453
Grant/Contract Number:  
FC02-99ER54512; FG02-92ER54141; SC0008605; SC0012174; SC0013977; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 2; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; H-mode pedestal; anomalous transport; drift resistive ballooning modes; kinetic ballooning modes; validation; particle transport; thermal transport

Citation Formats

Pankin, A. Y., Hughes, J. W., Greenwald, M. J., Kritz, A. H., and Rafiq, T. Anomalous transport in the H-mode pedestal of Alcator C-Mod discharges. United States: N. p., 2016. Web. doi:10.1088/0029-5515/57/2/022012.
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Pankin, A. Y., Hughes, J. W., Greenwald, M. J., Kritz, A. H., & Rafiq, T. Anomalous transport in the H-mode pedestal of Alcator C-Mod discharges. United States. https://doi.org/10.1088/0029-5515/57/2/022012
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Pankin, A. Y., Hughes, J. W., Greenwald, M. J., Kritz, A. H., and Rafiq, T. Fri . "Anomalous transport in the H-mode pedestal of Alcator C-Mod discharges". United States. https://doi.org/10.1088/0029-5515/57/2/022012. https://www.osti.gov/servlets/purl/1535439.
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@article{osti_1535439,
title = {Anomalous transport in the H-mode pedestal of Alcator C-Mod discharges},
author = {Pankin, A. Y. and Hughes, J. W. and Greenwald, M. J. and Kritz, A. H. and Rafiq, T.},
abstractNote = {Anomalous transport in the H-mode pedestal region of five Alcator C-Mod discharges, representing a collisionality scan is analyzed. The understanding of anomalous transport in the pedestal region is important for the development of a comprehensive model for the H-mode pedestal slope. In this research, a possible role of the drift resistive inertial ballooning modes (Rafiq et al 2010 Phys. Plasmas 17 082511) in the edge of Alcator C-Mod discharges is analyzed. The stability analysis, carried out using the TRANSP code, indicates that the DRIBM modes are strongly unstable in Alcator C-Mod discharges with large electron collisionality. An improved interpretive analysis of H-mode pedestal experimental data is carried out utilizing the additive flux minimization technique (Pankin et al 2013 Phys. Plasmas 20 102501) together with the guiding-center neoclassical kinetic XGC0 code. The neoclassical and neutral physics are simulated in the XGC0 code and the anomalous fluxes are computed using the additive flux minimization technique. The anomalous fluxes are reconstructed and compared with each other for the collisionality scan Alcator C-Mod discharges. It is found that the electron thermal anomalous diffusivities at the pedestal top increase with the electron collisionality. This dependence can also point to the drift resistive inertial ballooning modes as the modes that drive the anomalous transport in the plasma edge of highly collisional discharges.},
doi = {10.1088/0029-5515/57/2/022012},
journal = {Nuclear Fusion},
number = 2,
volume = 57,
place = {United States},
year = {Fri Sep 30 00:00:00 EDT 2016},
month = {Fri Sep 30 00:00:00 EDT 2016}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1088/0029-5515/57/2/022012
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