Comments on experimental results of energy confinement of tokamak plasmas

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The results of energy-confinement experiments on steady-state tokamak plasmas are examined. For plasmas with auxiliary heating, an analysis based on the heat diffusion equation is used to define heat confinement time (the incremental energy confinement time). For ohmically sustained plasmas, experiments show that the onset of the saturation regime of energy confinement, marfeing, detachment, and disruption are marked by distinct values of the parameter /bar n//sub e///bar j/. The confinement results of the two types of experiments can be described by a single surface in 3-dimensional space spanned by the plasma energy, the heating power, and the plasma density: the ... continued below

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Pages: 42

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Chu, T.K. April 1, 1989.

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Description

The results of energy-confinement experiments on steady-state tokamak plasmas are examined. For plasmas with auxiliary heating, an analysis based on the heat diffusion equation is used to define heat confinement time (the incremental energy confinement time). For ohmically sustained plasmas, experiments show that the onset of the saturation regime of energy confinement, marfeing, detachment, and disruption are marked by distinct values of the parameter /bar n//sub e///bar j/. The confinement results of the two types of experiments can be described by a single surface in 3-dimensional space spanned by the plasma energy, the heating power, and the plasma density: the incremental energy confinement time /tau//sub inc/ = ..delta..W/..delta..P is the correct concept for describing results of heat confinement in a heating experiment; the commonly used energy confinement time defined by /tau//sub E/ = W/P is not. A further examination shows that the change of edge parameters, as characterized by the change of the effective collision frequency ..nu../sub e/*, governs the change of confinement properties. The totality of the results of tokamak experiments on energy confinement appears to support a hypothesis that energy transport is determined by the preservation of the pressure gradient scale length. 70 refs., 6 figs., 1 tab.

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Pages: 42

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NTIS, PC A03/MF A01 - OSTI; 1.

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  • Other Information: Portions of this document are illegible in microfiche products

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  • Other: DE89010315
  • Report No.: PPPL-2606
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/6139480 | External Link
  • Office of Scientific & Technical Information Report Number: 6139480
  • Archival Resource Key: ark:/67531/metadc1112360

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • April 1, 1989

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • March 22, 2018, 6:52 p.m.

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Chu, T.K. Comments on experimental results of energy confinement of tokamak plasmas, report, April 1, 1989; United States. (digital.library.unt.edu/ark:/67531/metadc1112360/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.