Microwave Imaging Reflectometry for the Measurement of Turbulent Fluctuations in Tokamaks

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This article describes a numerical study of microwave reflectometry for the measurement of turbulent fluctuations in tokamak-like plasmas with a cylindrical geometry. Similarly to what was found previously in plane-stratified plasmas, the results indicate that the characteristics of density fluctuations cannot be uniquely determined from the reflected waves if the latter are allowed to propagate freely to the point of detection, as in standard reflectometry. Again, we find that if the amplitude of fluctuations is below a threshold that is set by the spectrum of poloidal wave numbers, the local characteristics of density fluctuations can be obtained from the phase ... continued below

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4.7 MB pages

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Mazzucato, E. February 19, 2004.

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Description

This article describes a numerical study of microwave reflectometry for the measurement of turbulent fluctuations in tokamak-like plasmas with a cylindrical geometry. Similarly to what was found previously in plane-stratified plasmas, the results indicate that the characteristics of density fluctuations cannot be uniquely determined from the reflected waves if the latter are allowed to propagate freely to the point of detection, as in standard reflectometry. Again, we find that if the amplitude of fluctuations is below a threshold that is set by the spectrum of poloidal wave numbers, the local characteristics of density fluctuations can be obtained from the phase of reflected waves when these are collected with a wide aperture antenna, and an image of the cutoff is formed onto an array of phase-sensitive detectors.

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4.7 MB pages

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INIS; OSTI as DE00821811

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  • Other Information: PBD: 19 Feb 2004

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  • Report No.: PPPL-3924
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/821811 | External Link
  • Office of Scientific & Technical Information Report Number: 821811
  • Archival Resource Key: ark:/67531/metadc781401

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  • February 19, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 6:26 p.m.

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Mazzucato, E. Microwave Imaging Reflectometry for the Measurement of Turbulent Fluctuations in Tokamaks, report, February 19, 2004; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc781401/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.