Interferometric Study of Density Fluctuations in a Tokamak Plasma PDF Download
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Author: Raffi Nazikian
Publisher:
ISBN:
Category : Interferometry
Languages : en
Pages :
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Author: Raffi Nazikian
Publisher:
ISBN:
Category : Interferometry
Languages : en
Pages :
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Author: R. L. Kubena
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 228
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An experimental investigation of low frequency floating potential fluctuations (f d"200 kHz) in a research tokamak plasma using two spatially separated electrostatic probes has been performed. The spectra, correlation length, and the phase velocity of the fluctuations in both the radial and azimuthal direction have been determined. The propagation velocity in the toroidal direction was also measured and was found to be in the direction of electron current flow. The waves traveled azimuthally in the ion diamagnetic drift direction, even after the usual E x B rotation was taken into account. The electron density fluctuations associated with these oscillations were large, [delta]n/n [approximately] 0.35 - 0.50. The spectra were found to have regularly spaced peaks which seemed to be related to specific azimuthal modes (m =1,2,3, ..., etc.) A parametric study was made to determine what effect plasma parameters had on these peaks. During periods of high electron density in the first 2 msec of the plasma lifetime, strong sawtooth type oscillations were observed. These oscillations typically had frequencies of approximately 10 kHz and were also present when large amounts of neutral gas were added during the discharge by a process called "gas puffing." The results are compared with experimental observations made on other plasma devices with electric and magnetic probes and with microwave and CO2 laser scattering techniques. (The scattering measurements are complimentary to the probe measurements since, in the former case, the wavelength is fixed by the scattering angle, but the oscillations could not be spatially localized.) The oscillations in the Caltech torus were probably related to a drift-tearing type instability which is thought to play a major role in the anomalous particle and energy flux observed in tokamaks. Comparisons are made between current theory and the experimental results. However, the theory for the observed oscillations is still in a rudimentary stage of development, and it is hoped that the present investigation will stimulate future analytical work.
Author: Leslie Bromberg
Publisher:
ISBN:
Category : Plasma stability
Languages : en
Pages : 17
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Author:
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ISBN:
Category :
Languages : en
Pages : 0
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Author: E. Mazzucato
Publisher:
ISBN:
Category : Scattering (Physics)
Languages : en
Pages : 25
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Author: A. A. Howling
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 215
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Author: Harold T. Evensen
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
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Author:
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Category :
Languages : en
Pages :
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A new kind of quasi-coherent fluctuation is observed near the edge of plasmas in the PDX tokamak during H-mode operation. (The H-mode occurs in neutral beam heated divertor plasmas and is characterized by improved energy containment as well as large density and temperature gradients near the plasma edge.) These fluctuations are evidenced as VUV and density fluctuation bursts at well-defined frequencies (.delta omega./.omega. less than or equal to 0.1) in the frequency range between 50 and 180 kHz. They affect the edge temperature-density product, and therefore they may be important for understanding the relationship between the large edge density and temperature gradients and the improved energy confinement.
![Observation of Thomson Scattering from Ion Thermal Fluctuations in a Tokamak Plasma with a 385[mu]m Laser PDF](https://books.google.com/books/content/images/frontcover/AFcvHQAACAAJ?fife=w80-h100)
Author: Paul P. Woskov
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Author: John Wesson
Publisher: Oxford University Press
ISBN: 0199592233
Category : Science
Languages : en
Pages : 828
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Book Description
The tokamak is the principal tool in controlled fusion research. This book acts as an introduction to the subject and a basic reference for theory, definitions, equations, and experimental results. The fourth edition has been completely revised, describing their development of tokamaks to the point of producing significant fusion power.
