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Estimate of convective radial transport due to SOL turbulence as measured by GPI in Alcator C-Mod

Autor: D. A. D'Ippolito, S. I. Krasheninnikov, Martin Greenwald, J. L. Terry, D. A. Russell, J. R. Myra, B. LaBombard, S. J. Zweben, M. V. Umansky, Olaf Grulke, D. P. Stotler, J. W. Hughes, M. Agostini

Publikováno v: Journal of nuclear materials 415 (2011): S463–S466. doi:10.1016/j.jnucmat.2010.08.018
info:cnr-pdr/source/autori:S.J. Zweben; J.L. Terry; B. LaBombard; M. Agostini; M. Greenwald; O. Grulke; J.W. Hughes; D.A. D'Ippolito; S.I. Krasheninnikov; J.R. Myra; D.A. Russell; D.P. Stotler; M. Umansky/titolo:Estimate of convective radial transport due to SOL turbulence as measured by GPI in Alcator C-Mod/doi:10.1016%2Fj.jnucmat.2010.08.018/rivista:Journal of nuclear materials/anno:2011/pagina_da:S463/pagina_a:S466/intervallo_pagine:S463–S466/volume:415

The convective radial transport effects of SOL turbulence have been estimated using recent turbulence data from the gas puff imaging (GPI) camera diagnostic on Alcator C-Mod. The average radial turbulence speed within the region 1-2 cm outside the se

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e654f9a251ac41e06153f6f20c070a6b
https://doi.org/10.1016/j.jnucmat.2010.08.018

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On Numerical Solution of Strongly Anisotropic Diffusion Equation on Misaligned Grids

Autor: M. V. Umansky, T. D. Rognlien, Marcus S. Day

Publikováno v: Numerical Heat Transfer, Part B: Fundamentals. 47:533-554

Problems with extremely high-transport anisotropy often arise in strongly magnetized plasmas. The numerical solution of the highly anisotropic transport equations becomes quite difficult when the computational grid is not aligned with the strong tran

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa66039cc3169c7026556143cbc5f7e2
https://doi.org/10.1080/10407790590928946

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Improved understanding of the hot cathode current modes and mode transitions

Autor: M D Campanell, M V Umansky

Publikováno v: Plasma Sources Science and Technology. 26:124002

Hot cathodes are crucial components in a variety of plasma sources and applications, but they induce mode transitions and oscillations that are not fully understood. It is often assumed that negatively biased hot cathodes have a space-charge limited

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3b137f4e1d66c0ddd4861f57ee344b8d
https://doi.org/10.1088/1361-6595/aa97a9

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Stabilization of the resistive wall mode by flowing metal walls

Autor: J. P. Freidberg, M. V. Umansky, Riccardo Betti

Publikováno v: Physics of Plasmas. 8:4427-4434

The effect of flowing metal walls on the resistive wall instabilities is analyzed for a general cylindrically symmetric diffusive pinch configuration. Two types of liquid metal flow are analyzed: a uniform flow which is poloidally symmetric, and a tw

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f9166bc04279810ff5be180a8cc3907
https://doi.org/10.1063/1.1399328

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Relaxation of thermal spikes

Autor: M. V. Umansky, Yu. V. Martynenko

Publikováno v: Radiation Effects and Defects in Solids. 132:31-39

Thermal-spike evolution has been investigated using a method of numerical hydrodynamics. A pattern of origination of a shock-wave arising from a spike is presented. The fraction of energy taken away by the wave has been calculated as a function of th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f0f8e33f96fb29485f722934e6fc1926
https://doi.org/10.1080/10420159408219254

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Divertor with a third-order null of the poloidal field

Autor: D. D. Ryutov, M. V. Umansky

Publikováno v: Physics of Plasmas. 20:092509

A concept and preliminary feasibility analysis of a divertor with the third-order poloidal field null is presented. The third-order null is the point where not only the field itself but also its first and second spatial derivatives are zero. In this

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91c8ff50c170cb3c6ddff101382bb060
https://doi.org/10.1063/1.4821603

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