Measurement of Magnetic Fluctuations at Small Spatial Scales in the Tokapole II Tokamak PDF Download
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Author: Edward Joseph Haines
Publisher:
ISBN:
Category :
Languages : en
Pages : 306
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Author: Edward Joseph Haines
Publisher:
ISBN:
Category :
Languages : en
Pages : 306
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Author:
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ISBN:
Category :
Languages : en
Pages : 72
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This thesis is a presentation of the measurements of short-wavelength, high-frequency radial magnetic fluctuations performed on the Tokapole 2 tokamak at the University of Wisconsin-Madison. Theories of electron temperature gradient ([eta]{sub e}) driven turbulence predict the existence of increased magnetic fluctuation power at small spatial scales near the collisionless skin depth c/[omega]{sub pe} and over a wide range of frequencies near and below the electron diamagnetic drift frequency [omega]*{sub ne}. Small magnetic probes of sizes down to 1 m m have been constructed and used to resolve short poloidal and radial wavelength magnetic fluctuations. These probes have been used with larger probes to make comparisons of fluctuation spectra measured in various ranges of wavelength and over the range of frequencies from 10 kHz to 6 MHz in Tokapole 2 plasmas. A calculation of the short-wavelength, high-frequency response of an electrostatically shielded model B{sub r} probe has been performed to guide the interpretation of the power comparison measurements. Comparisons of magnetic fluctuation spectra at various positions within the plasma, and for discharges with edge safety factor 1, 2, and 3 are presented. The linear and nonlinear theories and numerical simulations of [eta]{sub e} turbulence are reviewed and compared, where possible with the experimental parameters and results.
Author: Michael Arthur LaPointe
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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![Fluctuation Measurements at C/[omega]{sub Pe} Spatial Scales in a Tokamak PDF](https://books.google.com/books/content/images/frontcover/o9d6AQAACAAJ?fife=w80-h100)
Author:
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ISBN:
Category :
Languages : en
Pages : 34
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Magnetic and electrostatic fluctuations have been measured at the short scale length of the collisionless skin depth (c/[omega]{sub pe} using small magnetic and electrostatic probes in the Tokapole II tokamak. For certain conditions and at high frequency (MHz range) the amplitude is observed to increase as wavelength is decreased toward the c/[omega]{sub pe} scale. Wavelength dependence is inferred from measurements with probes of varying sizes. The amplitude of the turbulence at the c/[omega]{sub pe} scale is smaller than the dominant low frequency turbulence, and is thus not relevant to transport in Tokapole II. Comparison with theoretical treatments of c/[omega]{sub pe} turbulence is discussed.
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Category : Aeronautics
Languages : en
Pages : 464
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Author: United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Investigations and Oversight
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Category : Fusion reactors
Languages : en
Pages : 820
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Author: Dale Edward Graessle
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Category :
Languages : en
Pages : 320
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Author:
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Category : Controlled fusion
Languages : en
Pages : 134
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Author:
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Category : Power resources
Languages : en
Pages : 782
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Author:
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Category : Dissertation abstracts
Languages : en
Pages : 724
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