The Role of Electric Field Shear Stabilization of Turbulence in the H-mode to VH-mode Transition in DIII-D. PDF Download
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Languages : en
Pages : 4
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Languages : en
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![H-mode and VH-mode Confinement Improvement in DIII-D: Investigations of Turbulence, Local Transport, and Active Control of the Shear in the E[times] B Flow PDF](https://books.google.com/books/content/images/frontcover/k735jwEACAAJ?fife=w80-h100)
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Languages : en
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The hypothesis of stabilization of turbulence by shear in the E[times] B drift speed successfully predicts the observed turbulence reduction and confinement improvement seen at the L to H transition. This same hypothesis is the best explanation to date for the further confinement improvement seen in the plasma core when the plasma goes from H-mode to VH-mode. Consequently, the most fundamental question for H-mode studies now is: how is the electric field E[sub r] formed? The radial force balance equation relates E[sub r] to the main ion pressure gradient[triangledown]P[sub i], poloidal rotation[nu][sub[theta]i], and toroidal rotation[nu][sub[phi]i]. In the plasma edge, direct measurements show[triangledown]P[sub i] and[nu][sub[theta]i] are the important terms at the L to H transition, with[triangledown]P[sub i] being the dominant, negative term throughout most of the H-mode. Since E[sub r] is observed to change prior to the change in[triangledown]P[sub i], the authors infer that main ion rotation, probably[nu][sub[theta]i], changes first, triggering the transition. E[sub r] is seen to change prior to the change in fluctuations, consistent with E[times] B shear causing the change in fluctuations and transport. In the plasma core, E[sub r] is primarily related to[nu][sub[phi]i]. There is a clear temporal and spatial correlation between the change in E[times] B shear and the region of local confinement improvement when the plasma goes from H-mode to VH-mode. Direct manipulation of[nu][sub[phi]i] and E[times] B shear using the drag produced by a non-axisymmetric magnetic perturbation has produced clear changes in local transport consistent with the E[times] B shear stabilization hypothesis. The implications of these results for theories of the L to H and H to VH transitions will be discussed. 83 refs., 5 figs.
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Category : Aeronautics
Languages : en
Pages : 704
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Category : Power resources
Languages : en
Pages : 544
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Author: K. Herschbach
Publisher: Newnes
ISBN: 0444599738
Category : Technology & Engineering
Languages : en
Pages : 892
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The objective of the Symposium on Fusion Technology (SOFT) conference is to set the stage for the exchange of information on the design, construction, and operation of fusion experiments and the technology which is being developed for the next-step devices and for fusion reactors. These proceedings therefore present an up-to-date and throrough review of the state-of-the art in this dynamic field.
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Category : Research
Languages : en
Pages : 1190
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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Category : Controlled fusion
Languages : en
Pages : 626
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Author: P. H. Sakanaka
Publisher: American Institute of Physics
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Category : Science
Languages : en
Pages : 538
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Invited papers delivered at ICPP 1994, which is the joint conference of the 10th Kiev International Conference on Plasma Theory and the 10th International Congress on Waves and Instabilities in Plasmas. In addition to summary talks and an opening colloquium on solar eclipses, subjects addressed incl
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Category : Controlled fusion
Languages : en
Pages : 460
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Category : Controlled fusion
Languages : en
Pages : 838
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