skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Journal Article · · Nuclear Fusion
 [1];  [2];  [2];  [3];  [3]
  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)
+ Show Author Affiliations

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.

Research Organization:
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 Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
FC02-99ER54512; FG02-92ER54141; SC0008605; SC0012174; SC0013977; AC02-05CH11231
OSTI ID:
1535439
Alternate ID(s):
OSTI ID: 1327453
Journal Information:
Nuclear Fusion, Vol. 57, Issue 2; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

References (22)

Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER journal August 2013
Transport-driven Scrape-Off-Layer flows and the boundary conditions imposed at the magnetic separatrix in a tokamak plasma journal September 2004
Verification and validation for magnetic fusion journal May 2010
Validation of transport models using additive flux minimization technique journal October 2013
Turbulent regimes in the tokamak scrape-off layer journal September 2013
Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling journal April 2015
A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model journal August 2011
Development of drift-resistive-inertial ballooning transport model for tokamak edge plasmas journal August 2010
Analysis of pedestal plasma transport journal May 2010
Kinetic modeling of divertor heat load fluxes in the Alcator C-Mod and DIII-D tokamaks journal September 2015
Diamagnetic stabilization of ideal ballooning modes in the edge pedestal journal July 1999
Models for the pedestal temperature at the edge of H-mode tokamak plasmas journal December 2002
Collisionality scaling of main-ion toroidal and poloidal rotation in low torque DIII-D plasmas journal May 2013
Integrated modeling of temperature profiles in L-mode tokamak discharges journal December 2014
Numerical analysis of drift resistive inertial ballooning modes journal September 2014
Cross-field plasma transport and main-chamber recycling in diverted plasmas on Alcator C-Mod journal December 2000
Physics basis of Multi-Mode anomalous transport module journal March 2013
Numerical study of neoclassical plasma pedestal in a tokamak geometry journal May 2004
A model for H mode pedestal width scaling using the International Pedestal Database journal October 2000
Paleoclassical transport in low-collisionality toroidal plasmas journal September 2005
Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod journal May 2001
Progress in quantifying the edge physics of the H mode regime in DIII-D journal December 2001

Similar Records

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
H-mode pedestal
anomalous transport
drift resistive ballooning modes
kinetic ballooning modes
validation
particle transport
thermal transport