Anomalous Electron-ion Energy Coupling in Electron Drift Wave Turbulence
Title | Anomalous Electron-ion Energy Coupling in Electron Drift Wave Turbulence PDF eBook |
Author | Lei Zhao |
Publisher | |
Pages | 96 |
Release | 2013 |
Genre | |
ISBN | 9781303212482 |
Turbulence is a ubiquitous phenomenon in nature, and it is well known that turbulence couples energy input to dissipation by cascade processes. Plasma turbulence play a critical role in tokamak confinement. Magnetized plasma turbulence is quasi 2D, anisotropic, wave like and two fluid (i.e. electrons and ions) in structure. Thus, weakly collisional plasma turbulence can mediate electron and ion energy transfer. The issue of anomalous electron and ion energy coupling is particularly important for low collisionality, electron heated plasmas, such as ITER. In this work, we reconsider the classic problem of turbulent heating and energy transfer pathways in drift wave turbulence. The total turbulent heating, composed of quasilinear electron cooling, quasilinear ion heating, nonlinear ion heating and zonal flow frictional heating, is analyzed. In Chapter 2, the electron and ion energy exchange via linear wave and particle resonance will be computed. To address net heating, we show the turbulent heating in an annulus arises due to a wave energy flux differential across this region. We show this net heating is proportional to the Reynolds work on the zonal flow. Zonal flow friction heats ions, thus the turbulence and zonal flow interaction enters as an important energy transfer channel. Since zonal flows are nonlinearly generated, it follows that we should apply weak turbulence theory to calculate the nonlinear ion turbulent heating via the virtual mode resonance in the electron drift wave turbulence, which will be discussed in Chapter 3. We defines a new collisionless turbulent energy transfer channel through nonlinear Landau damping in the electron and ion energy coupling process. The result shows that nonlinear ion heating can exceed quasilinear ion heating, so that nonlinear heating becomes the principal collisionless wave energy dissipation channel in electron drift wave turbulence. This follows since the beat mode resonates with the bulk of the ion distribution, in contrast to the linear resonance which is located on the tail. This result also suggests that zonal flow shearing is not necessarily the only saturation mechanism of importance, especially for very low collisionality. This observation brings a new perspective on electron heat transport where ions, play a role as an energy "sink" in a collisionless plasma, such as ITER. In addition, it is shown that the electron turbulent energy transfer to ions in a collisionless plasma can be the same order as electron heat transport losses. Thus, it is necessary to consider the influence of collisionless energy transfer to determine the total energy budget in ITER.
Fusion Energy Update
Title | Fusion Energy Update PDF eBook |
Author | |
Publisher | |
Pages | 144 |
Release | 1979 |
Genre | Controlled fusion |
ISBN |
Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 1572 |
Release | 1992 |
Genre | Aeronautics |
ISBN |
Nuclear Science Abstracts
Title | Nuclear Science Abstracts PDF eBook |
Author | |
Publisher | |
Pages | 612 |
Release | 1976 |
Genre | Nuclear energy |
ISBN |
ERDA Energy Research Abstracts
Title | ERDA Energy Research Abstracts PDF eBook |
Author | United States. Energy Research and Development Administration. Technical Information Center |
Publisher | |
Pages | 588 |
Release | 1976 |
Genre | Force and energy |
ISBN |
Space Plasma Simulations
Title | Space Plasma Simulations PDF eBook |
Author | M. Ashour-Abdalla |
Publisher | Springer Science & Business Media |
Pages | 575 |
Release | 2012-12-06 |
Genre | Science |
ISBN | 9400954549 |
The emergence over the past several years of space plasma simula tions as a distinct field of endeavor, rather than simply the somewhat startling offspring of plasma physics, computer simulations and space observations, has necessitated a concentrated effort at interdigitat ing its parent and component fields. After several years of working the benefits of a well-defined interactive community of those without working in the field, a group of those who had gained greatly from setting up joint research projects and other lines of communication, arranged to further these gains by setting up the First International School for Space Simulations, which was organized by Kyoto University and held in Kyoto, Japan in November 1982. Its unqualified success led to the organization of the second such School, this time by the University of California, Los Angeles, and held in Kapaa, Kauai, Hawaii. The Second International School for Space Simulations drew some 175 attendees from around the world; the distribution of attendees approached the targeted equal representation by established investi gators and graduate students/beginning investigators. This strong attendance by graduate students and beginning investigators was due to the generous support of a number of funding agencies from the United States and Japan as well as international scientific organizations.
Energy Research Abstracts
Title | Energy Research Abstracts PDF eBook |
Author | |
Publisher | |
Pages | 358 |
Release | 1992-03 |
Genre | Power resources |
ISBN |