Force balance and ion particle transport differences in high and low confinement tokamak edge pedestals

Stacey, W. M.; Groebner, R. J.
November 2010
Physics of Plasmas;Nov2010, Vol. 17 Issue 11, p112512
Academic Journal
The various terms in the radial force balance in the edge plasma are evaluated using experimental data from the low (L) and high (H) confinement phase of a DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)] discharge in order to investigate the differences in the radial force balance among the several electromagnetic and pressure gradient forces in L-mode and H-mode. The roles of cross-field toroidal momentum transport and of a radial pinch velocity in determining different radial particle fluxes in L-mode and H-mode are elucidated.


Related Articles

  • Some Approaches for Study of Momentum and Energy Transfer in a Gas/Solids System. Gerasimova, Olesya E.; Borisov, Sergey F.; Protsenko, Sergey P. // AIP Conference Proceedings;2005, Vol. 762 Issue 1, p999 

    Surface structure and its chemical composition play an important role in energy and momentum exchange in non-equilibrium gas-surface system. Any variation in micro parameters of interface both of chemical and structural character can lead to dramatically change in macroscopic heat flow between...

  • Theory of energetic ion transport induced by waves of ion cyclotron range of frequencies in a tokamak plasma. Chang, C. S.; Lee, June-Yub; Weitzner, Harold // Physics of Fluids B: Plasma Physics;Dec91, Vol. 3 Issue 12, p3429 

    A theoretical description of radial energetic-ion transport induced by electromagnetic waves of ion cyclotron range of frequencies (ICRF) is presented in a tokamak with general flux surface geometry. A known form of quasilinear operator is used to represent the ICRF wave-induced particle...

  • Linear gyrokinetic calculations of toroidal momentum transport in a tokamak due to the ion temperature gradient mode. Peeters, A. G.; Angioni, C. // Physics of Plasmas;Jul2005, Vol. 12 Issue 7, p072515 

    It is shown from a symmetry in the gyrokinetic equation that for up–down symmetric tokamak equilibria and for u[lowercase_phi_synonym]>ρυthi/r (where u[lowercase_phi_synonym] is the toroidal velocity, υthi is the thermal ion velocity, ρ is the Larmor radius, and r is the...

  • Simultaneous Heat and Momentum Transfer in Two-Phase Film Systems at Low Pressure. Babak, V. N.; Babak, T. B.; Kholpanov, L. P. // Theoretical Foundations of Chemical Engineering;Jul/Aug2003, Vol. 37 Issue 4, p313 

    The heat and momentum transfer in a liquid–vapor two-phase film system at high temperature and low pressure is studied as applied to removal of highly volatile fractions from high-boiling liquids. It is shown that the working zone can be divided into two regions, namely, the initial...

  • Simulation of Radial Variation of Neutral Atoms on Edge Plasma of Small Size Divertor Tokamak. Bekheit, Amr Hasheim // Journal of Modern Physics (21531196);Feb2012, Vol. 3 Issue 2, p145 

    Simulations have been performed to investigate the impact of radial variation of neutral atoms (neutral puff) on the edge plasma of small size divertor tokamak. It was demonstrated that, the variation of neutral atoms (neutral puff) in edge plasma of small size divertor tokamak generates...

  • Transport properties of the interacting magnetic-island model of tokamak plasmas. Gianakon, T.A.; Callen, J.D.; Hegna, C.C. // Physics of Plasmas;Jul94, Vol. 1 Issue 7, p2245 

    Explores the equilibrium and transient transport properties of a mixed magnetic topology model for tokamak equilibria. Composition of magnetic topology; Nonlinear dependence of the heat flux on the pressure gradient; Exhibition of a heat pulse diffusion coefficient larger than the power balance...

  • The impact of a biasing radial electric field on the scrape-off layer in a divertor tokamak. Rozhansky, V.; Tendler, M. // Physics of Plasmas;Aug94, Vol. 1 Issue 8, p2711 

    Addresses the issue of transport on open field lines using a fluid approach invoking anomalous inertia and viscosity. Emphasis of the model on transport of the toroidal momentum; Benefits of tokamaks with divertors from an amplification of the electric field; Phenomena resulting from the...

  • On the statistical mechanics of self-organized profiles. Medvedev, M.V.; Diamond, P.H. // Physics of Plasmas;Oct96, Vol. 3 Issue 10, p3745 

    Analyzes the radial structure of tokamak profiles determined by anomalous transport elucidated by studying the statistical mechanics of a sand pile automation for which the toppling conditions depend on local gradient. Markovian nature of the sand pile dynamics; Spatial profiles obtained from...

  • Predictive transport simulations of internal transport barriers using the Multi-Mode model. Zhu, P.; Bateman, G.; Kritz, A. H.; Horton, W. // Physics of Plasmas;Jul2000, Vol. 7 Issue 7 

    The formation of internal transport barriers observed in both Joint European Torus (JET) [P. H. Rebut, R. J. Bickerton, and B. E. Keen, Nucl. Fusion 25, 1011 (1985)] and Doublet III-D Tokamak (DIII-D) [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)] are reproduced in predictive...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics