Measurement of magnetic fluctuations at small spatial scales in the Tokapole II tokamak

Technical Report · Thu Aug 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/5218298· OSTI ID:5218298

Haines, E J

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.

• Research Organization: Univ. of Wisconsin, Madison, WI (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-85ER53198
• OSTI ID: 5218298
• Report Number(s): DOE/ER/53198-180; ON: DE92000161
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

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