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 »
- Authors:
-
- Tech-X Corporation, Boulder, CO (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- 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.
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
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.
@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}
}
Web of Science
Works referenced in this record:
Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER
journal, August 2013
- Groebner, R. J.; Chang, C. S.; Hughes, J. W.
- Nuclear Fusion, Vol. 53, Issue 9
Transport-driven Scrape-Off-Layer flows and the boundary conditions imposed at the magnetic separatrix in a tokamak plasma
journal, September 2004
- LaBombard, B.; Rice, J. E.; Hubbard, A. E.
- Nuclear Fusion, Vol. 44, Issue 10
Verification and validation for magnetic fusion
journal, May 2010
- Greenwald, Martin
- Physics of Plasmas, Vol. 17, Issue 5
Validation of transport models using additive flux minimization technique
journal, October 2013
- Pankin, A. Y.; Kruger, S. E.; Groebner, R. J.
- Physics of Plasmas, Vol. 20, Issue 10
Turbulent regimes in the tokamak scrape-off layer
journal, September 2013
- Mosetto, Annamaria; Halpern, Federico D.; Jolliet, Sébastien
- Physics of Plasmas, Vol. 20, Issue 9
Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling
journal, April 2015
- Diallo, A.; Hughes, J. W.; Baek, S-G.
- Nuclear Fusion, Vol. 55, Issue 5
A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model
journal, August 2011
- Snyder, P. B.; Groebner, R. J.; Hughes, J. W.
- Nuclear Fusion, Vol. 51, Issue 10
Development of drift-resistive-inertial ballooning transport model for tokamak edge plasmas
journal, August 2010
- Rafiq, T.; Bateman, G.; Kritz, A. H.
- Physics of Plasmas, Vol. 17, Issue 8
Analysis of pedestal plasma transport
journal, May 2010
- Callen, J. D.; Groebner, R. J.; Osborne, T. H.
- Nuclear Fusion, Vol. 50, Issue 6
Kinetic modeling of divertor heat load fluxes in the Alcator C-Mod and DIII-D tokamaks
journal, September 2015
- Pankin, A. Y.; Rafiq, T.; Kritz, A. H.
- Physics of Plasmas, Vol. 22, Issue 9
Diamagnetic stabilization of ideal ballooning modes in the edge pedestal
journal, July 1999
- Rogers, B. N.; Drake, J. F.
- Physics of Plasmas, Vol. 6, Issue 7
Models for the pedestal temperature at the edge of H-mode tokamak plasmas
journal, December 2002
- Onjun, T.; Bateman, G.; Kritz, A. H.
- Physics of Plasmas, Vol. 9, Issue 12
Collisionality scaling of main-ion toroidal and poloidal rotation in low torque DIII-D plasmas
journal, May 2013
- Grierson, B. A.; Burrell, K. H.; Solomon, W. M.
- Nuclear Fusion, Vol. 53, Issue 6
Integrated modeling of temperature profiles in L-mode tokamak discharges
journal, December 2014
- Rafiq, T.; Kritz, A. H.; Tangri, V.
- Physics of Plasmas, Vol. 21, Issue 12
Numerical analysis of drift resistive inertial ballooning modes
journal, September 2014
- Tangri, V.; Rafiq, T.; Kritz, A. H.
- Physics of Plasmas, Vol. 21, Issue 9
Cross-field plasma transport and main-chamber recycling in diverted plasmas on Alcator C-Mod
journal, December 2000
- LaBombard, B.; Umansky, M. V.; Boivin, R. L.
- Nuclear Fusion, Vol. 40, Issue 12
Physics basis of Multi-Mode anomalous transport module
journal, March 2013
- Rafiq, T.; Kritz, A. H.; Weiland, J.
- Physics of Plasmas, Vol. 20, Issue 3
Numerical study of neoclassical plasma pedestal in a tokamak geometry
journal, May 2004
- Chang, C. S.; Ku, Seunghoe; Weitzner, H.
- Physics of Plasmas, Vol. 11, Issue 5
A model for H mode pedestal width scaling using the International Pedestal Database
journal, October 2000
- Sugihara, M.; Igitkhanov, Yu; Janeschitz, G.
- Nuclear Fusion, Vol. 40, Issue 10
Paleoclassical transport in low-collisionality toroidal plasmas
journal, September 2005
- Callen, J. D.
- Physics of Plasmas, Vol. 12, Issue 9
Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod
journal, May 2001
- LaBombard, B.; Boivin, R. L.; Greenwald, M.
- Physics of Plasmas, Vol. 8, Issue 5
Progress in quantifying the edge physics of the H mode regime in DIII-D
journal, December 2001
- Groebner, R. J.; Baker, D. R.; Burrell, K. H.
- Nuclear Fusion, Vol. 41, Issue 12