Trapped gyro-Landau-fluid transport modeling of DIII-D hybrid discharges

Kinsey, J. E.; Staebler, G. M.; Petty, C. C.
December 2010
Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122315
Academic Journal
Previous work has summarized the physics and first results of benchmarking the trapped gyro-Landau-fluid (TGLF) model for turbulent transport driven by trapped ion and electron modes, ion and electron temperature gradient (ETG) modes, and electromagnetic kinetic ballooning modes including the effects of shaped geometry. Recently, an improved collision model was implemented which provides a more accurate fit to a transport database of nonlinear collisional GYRO [J. Candy and R. E. Waltz, J. Comput. Phys. 186, 545 (2003)] simulations of long wavelength driftwave turbulence. The impact of the new collision model on TGLF modeling results was unknown. Using the improved TGLF model we obtain excellent agreement with the ion and electron temperature profiles from 30 DIII-D [A. Mahdavi and J. L. Luxon, Fusion Sci. Technol. 48, 2 (2005)] hybrid discharges. The transport results show that the electron energy transport tends to be dominated by short wavelength ETG modes in cases where the ion energy transport approaches neoclassical levels. The hybrid regime has significant energy confinement improvement from E×B velocity shear which is well predicted by TGLF. Weak magnetic shear and low safety factor are also shown to enhance the hybrid regime energy confinement. In high normalized β hybrids, we find that finite β effects noticably reduce the predicted electron energy transport and improve agreement with the measured electron temperature profiles.


Related Articles

  • Theoretical Evaluation of the Escape Rate of Charged Particles Trapped in a Potential Energy Well. Chang, Yongbin; Ordonez, C.A. // AIP Conference Proceedings;2003, Vol. 680 Issue 1, p148 

    In various types of charged particle sources and traps, charged particles are temporarily trapped within a potential energy well. In the work reported, a theoretical evaluation of the escape rate of trapped charged particles is carried out. As a specific example, the loss rate is evaluated for...

  • Transport of fast particles in turbulent fields. Pueschel, M. J. // AIP Conference Proceedings;9/24/2012, Vol. 1478 Issue 1, p23 

    In light of planned ITER operation, it is important to improve understanding of fast particle behavior. This work focuses on the influence of both electrostatic and electromagnetic background microturbulent fields by studying passive fast ions in gyrokinetic turbulence simulations. Since...

  • Fragment charge correlations and spinodal decomposition in finite nuclear systems. T&acaron;b&acaron;caru, G.; Borderie, B.; Désesquelles, P.; Pârlog, M.; Rivet, M. F.; Bougault, R.; Bouriquet, B.; Buta, A. M.; Galichet, E.; Guiot, B.; Lautesse, P.; Le Neindre, N.; Manduci, L.; Rosato, E.; Tamain, B.; Vigilante, M.; Wieleczko, J. P. // European Physical Journal A -- Hadrons & Nuclei;Oct2003, Vol. 18 Issue 1, p103 

    Enhanced production of events with almost equal-sized fragments is experimentally revealed by charge correlations in the multifragmentation of a finite nuclear system selected in 129Xe central collisions on natSn. The evolution of their weight with the incident energy: 32, 39, 45, 50 AMeV, is...

  • Gyrokinetic δf simulation of the collisionless and semicollisional tearing mode instability. Wan, W.; Chen, Y.; Parker, S. E. // Physics of Plasmas;Jan2005, Vol. 12 Issue 1, p012311 

    The evolution of collisionless and semicollisional tearing mode instabilities is studied using an electromagnetic gyrokinetic δf particle-in-cell simulation model. Drift-kinetic electrons are used. Linear eigenmode analysis is presented for the case of fixed ions and there is excellent...

  • Behavior of polarizable models in presence of strong electric fields. I. Origin of nonlinear effects in water point-charge systems. Chelli, Riccardo; Barducci, Alessandro; Bellucci, Luca; Schettino, Vincenzo; Procacci, Piero // Journal of Chemical Physics;11/15/2005, Vol. 123 Issue 19, p194109 

    In the current opinion, the inclusion of polarization response in classical computer simulations is considered as one of the most important and urgent improvements to be implemented in modern empirical potential models. In this work we focus on the capability of polarizable models, based on the...

  • Isospin effects in central heavy-ion collisions at Fermi energy. GALICHET, E.; RIVET, M.-F.; GAGNON-MOISAN, F.; BORDERIE, B.; COLONNA, M.; ROY, R. // EPJ Web of Conferences;2012, Issue 31, p00017-p.1 

    N/Z effects were observed on variables measured in central Xe on Sn collisions around the Fermi energy. Comparisons were made with dynamical simulations of collisions in which the symmetry term of the EOS was varied. In this framework it appeared that the observed effects were due to the...

  • Leutwyler-Smilga sum rules in the Schwinger model. Shifrin, L.; Verbaarschot, J. J. M. // AIP Conference Proceedings;2007, Vol. 892 Issue 1, p217 

    We outline the microscopic derivation of the subset of Leutwyler-Smilga spectral sum rules in the 2-dimensional Schwinger model. As a side result, we obtain an expression for the sum rule in any external gauge field, for an arbitrary topological sector. This result generalizes the one due to...

  • Recent results in particle and nuclear physics from lattice QCD. Hatsuda, Tetsuo // AIP Conference Proceedings;4/19/2012, Vol. 1441 Issue 1, p49 

    Selected topics in lattice QCD applied to particle and nuclear physics are presented. Some emphases are placed on the determination of the baryon-baryon interaction from full QCD simulations and its future perspective.

  • Conceptual design and performance simulations of super-compact electromagnetic calorimeter. Skoda, Libor // EPJ Web of Conferences;2013, Issue 60, p1 

    Measurements of particle production at forward rapidities in high energy p-p, p-A and A-A collisions provide access to physics processes at very low Bjorken x. These measurements will allow to study the gluon saturation scale and improve our knowledge of parton distribution in nuclei. Specific...


Read the Article


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

Try another library?
Sign out of this library

Other Topics