Experimental Studies of Cross-magnetic-field Transport in Nonneutral Plasmas PDF Download
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Author: Eric Matthias Hollmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 322
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Author: Eric Matthias Hollmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 322
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Author: Kurt Anthony Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 150
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In this dissertation we present measurements of cross-magnetic-field heat transport in pure electron plasmas confined within a cylindrical Penning-Malmberg Trap. The measured heat transport is dominated by "long-range collisions", which are not included in classical transport theory. Most significantly, long-range collisions are observed to cause heat transport which is $\it{independent \ of \ the \ magnetic \ field}$, as opposed to classical theory which scales as $B^{-2}$. Modern theory predicts that long-range collisions are effective up to a Debye length, and thereby predicts transport rates which agree with the present measurements to within $50\%$. Experimentally, the electron plasma temperature is obtained versus radius and time by a newly-developed technique which measures the charge which escapes past controlled end-trapping barriers. We describe the technique in detail including the data collection, analysis and calibration. The method is validated via several experiments of the temporal evolution of the radial temperature profile including heating due to asymmetry-induced radial expansion, cooling due to cyclotron radiation and heating due to separatrix-crossing dissipation. The temperature diagnostic is shown to be robust and capable of obtaining spatial temperature resolution on the order of the Debye length. The technique is applicable to a variety of nonneutral plasma traps enabling temperature diagnostics for previously inaccessible experiments. From the measured density $n(r,t)$ and temperature $T(r,t)$ data, heat transport is analyzed as diffusion due to random particle collisions, convection due to bulk plasma flow, plus source terms consisting of Joule heating and cyclotron cooling. From these experiments we determine the cross-field thermal diffusivity, which we measure over a range of axial magnetic fields from $1
Author: C Wendell Horton, Jr
Publisher: #N/A
ISBN: 9813225904
Category : Science
Languages : en
Pages : 522
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For a few seconds with large machines, scientists and engineers have now created the fusion power of the stars in the laboratory and at the same time find the rich range of complex turbulent electromagnetic waves that transport the plasma confinement systems. The turbulent transport mechanisms created in the laboratory are explained in detail in the second edition of 'Turbulent Transport in Magnetized Plasmas' by Professor Horton.The principles and properties of the major plasma confinement machines are explored with basic physics to the extent currently understood. For the observational laws that are not understood — the empirical confinement laws — offering challenges to the next generation of plasma students and researchers — are explained in detail. An example, is the confinement regime — called the 'I-mode' — currently a hot topic — is explored.Numerous important problems and puzzles for the next generation of plasma scientists are explained. There is growing demand for new simulation codes utilizing the massively parallel computers with MPI and GPU methods. When the 20 billion dollar ITER machine is tested in the 2020ies, new theories and faster/smarter computer simulations running in near real-time control systems will be used to control the burning hydrogen plasmas.
Author: Jason Michael Kriesel
Publisher:
ISBN:
Category :
Languages : en
Pages : 424
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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The AASERT supplement N00014-93-1-0824 provided partial support for three graduate students. The students performed research on an existing pure electron plasma containment apparatus, on a new laser diagnosed ion plasma apparatus, and on a new camera diagnosed electron apparatus. The transport experiments recently demonstrated that energy and particle transfer across magnetic fields can be greatly enhanced due to long range interparticle collisions, stimulating new theory work. The experiments on collective plasma flows relate directly to conventional fluids, and demonstrated the spontaneous formation of 'vortex crystal' states during the relaxation of 2D turbulence. These experiments are also relevant to the technologies of ion cluster traps used for spectroscopic studies (EBIT) and time standards (Penning Traps).
Author: Francois Anderegg
Publisher: American Inst. of Physics
ISBN: 9780735400504
Category : Science
Languages : en
Pages : 768
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Non-neutral plasmas are clouds of electrons or ions or anti-matter particles contained in a vacuum by magnetic and electric fields. Experiments on these simplest of plasmas give precise tests of basic theories of equilibrium, waves, and cross-field transport. Technical applications include positron beams, mass spectroscopy, quantum computing, and beams for free-electron lasers.
Author: Harry S. Robertson
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Experimental: Experimental investigation of transport processes in cesium arc plasmas shows classical ambipolar diffusion across low magnetic fields, convective transport associated with the helical instability at intermediate fields, and a return, apparently to diffusive transport and relatively good confinement at magnetic fields ten to twenty times the critical field for the onset of the instability. Improved confinement is also achieved by using a hysteresis in the parameter space of the plasma operation, a procedure which may have wide applicability. Theoretical: The methods of Brownian motion are used to describe the diffusion of electrons and ions in a plasma across a magnetic field in the presence of an anisotropic dynamical friction. The bivariate distribution function of a plasma in a magnetic field and the partial differential equation which it satisfies are found and the distribution function is used to calculate the diffusion coefficients. (Author).
Author: Sergio Ortolani
Publisher: World Scientific
ISBN: 9814505838
Category : Science
Languages : en
Pages : 201
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This book gives a concise description of the phenomenon of plasma relaxation from the point of view of resistive magnetohydrodynamic (MHD) theory. Magnetized plasmas relax when they seek their natural state of lowest energy subject to certain topological constraints imposed by the magnetic field. Relaxation may be fast and dynamic or slow and gradual depending on the external environment in which the magnetoplasma system evolves. Relaxation occurs throughout the universe and may describe such diverse phenomena as dynamos, solar flares, and the operation of magnetic fusion energy experiments. This book concentrates on the dynamic, rather than variational aspects of relaxation. While the processes described are general, the book focuses on the reversed-field pinch experiment as a paradigm for plasma relaxation and dynamo action. Examples from other branches of plasma physics are also discussed. The authors draw upon their extensive experience in numerical and experimental studies of relaxation.
Author:
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 132
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 934
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