A Tutorial on Basic Principles of Microwave Reflectometry Applied to Fluctuation Measurements in Fusion Plasmas

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Microwave reflectometry is now routinely used for probing the structure of magnetohydrodynamic and turbulent fluctuations in fusion plasmas. Conditions specific to the core of tokamak plasmas, such as small amplitude of density irregularities and the uniformity of the background plasma, have enabled progress in the quantitative interpretation of reflectometer signals. In particular, the extent of applicability of the 1-D [one-dimensional] geometric optics description of the reflected field is investigated by direct comparison to 1-D full wave analysis. Significant advances in laboratory experiments are discussed which are paving the way towards a thorough understanding of this important measurement technique. Data is ... continued below

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676 Kilobytes pages

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Nazikian, R.; Kramer, G.J. & Valeo, E. February 16, 2001.

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Microwave reflectometry is now routinely used for probing the structure of magnetohydrodynamic and turbulent fluctuations in fusion plasmas. Conditions specific to the core of tokamak plasmas, such as small amplitude of density irregularities and the uniformity of the background plasma, have enabled progress in the quantitative interpretation of reflectometer signals. In particular, the extent of applicability of the 1-D [one-dimensional] geometric optics description of the reflected field is investigated by direct comparison to 1-D full wave analysis. Significant advances in laboratory experiments are discussed which are paving the way towards a thorough understanding of this important measurement technique. Data is presented from the Tokamak Fusion Test Reactor [R. Hawryluk, Plasma Physics and Controlled Fusion 33 (1991) 1509] identifying the validity of the geometric optics description of the scattered field and demonstrating the feasibility of imaging turbulent fluctuations in fusion scale devices.

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676 Kilobytes pages

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INIS; OSTI as DE00775582

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  • Other Information: PBD: 16 Feb 2001

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  • Report No.: PPPL-3545
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/775582 | External Link
  • Office of Scientific & Technical Information Report Number: 775582
  • Archival Resource Key: ark:/67531/metadc722639

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  • February 16, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 18, 2016, 1:10 p.m.

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Nazikian, R.; Kramer, G.J. & Valeo, E. A Tutorial on Basic Principles of Microwave Reflectometry Applied to Fluctuation Measurements in Fusion Plasmas, report, February 16, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc722639/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.