NDLI: High Performance Plasmas on the National Spherical Torus Experiment

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High Performance Plasmas on the National Spherical Torus Experiment

Content Provider	Semantic Scholar
Author	Gatesa, D. A. Bella, Michelangelo Bella, R. Della Bialekb, J. Bigelowc, T. Bittera, Mikulas Bonolid, P. Darrowa, D. Efthimiona, P. Ferrone, J. Fredricksona, E. Grishama, L. Hoseaa, J. Johnsona, D. Kaitaa, R. Kayea, S. Kubotaf, S. Kugela, H. LeBlanca, B. Maingic, R. Manickama, J. Maug, T. K. Maquedah, R. J. Mazzucatoa, E. Menarda, J. Muellera, D. Nelsoni, B. Nishinoj, N. Onoa, M. Paolettib, F. Paula, S. F. De Pengc, -K. M. Phillipsa, C. K. Ramani, Ramanathan Ryanc, P. Sabbaghb, S. A. Schaffere, M. Skinnera, C. H. Stutmank, D. Swainc, D. Synakowskia, E. Takasel, Y. Wilgenc, J. Wilsona, John R. Zhub, W. Zwebena, S. Bersd, A. Carterc, M. Dengm, B. Domierm, C. Doylef, E. Finkenthalk, M. Hilla, Knobler Jarboei, T. Jardina, S. Jia, Hui Laoe, L. Leeo, K. C. Luhmannm, N. Majeskia, R. Parka, H. Peeblesf, T. Pinskere, R. I. Portern, G. Ramd, A. Rensinkn, M. Rognlienn, T. Stotlera, D. Strattona, B. Taylora, G. Wamplero, W. Wurdenh, G. A. Xun, Xiaodong Zengf, L.
Copyright Year	2014
Abstract	The National Spherical Torus Experiment has produced toroidal plasmas at low aspect ratio (A = R/a = 0.86m/0.68m ~ 1.3, where R is the major radius and a is the minor radius of the torus) with plasma currents of 1.4MA. The rapid development of the machine has led to very exciting physics results during the first full year of physics operation. Pulse lengths in excess of 0.5s have been obtained with inductive current drive. Up to 4MW of High Harmonic Fast Wave (HHFW) heating power has been applied with 6MW planned. Using only 2MW of HHFW heating power clear evidence of electron heating is seen with HHFW, as observed by the multi point Thomson scattering diagnostic. A non-inductive current drive concept known as Coaxial Helicity Injection (CHI) has driven 260kA of toroidal current. Neutral beam heating power of 5MW has been injected. Plasmas with βt (=2μ0 /B 2 = a measure of magnetic confinement efficiency) of 22% have been achieved, as calculated using the EFIT equilibrium reconstruction code. β limiting phenomena have been observed, and the maximum βt scales with Ip/aBt. High frequency (>MHz) magnetic fluctuations have been observed. H-mode plasmas are observed with confinement times of > 100ms. Beam heated plasmas show energy confinement times in excess of those predicted by empirical scaling expressions. Ion temperatures in excess of 2.0keV have been measured, and power balance suggests that the power loss from the ions to the electrons may exceed the calculated classical input power to the ions.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.dtic.mil/dtic/tr/fulltext/u2/a638816.pdf
Language	English
Access Restriction	Open
Subject Keyword	Aspect Ratio CHI Electron Electrons Heating Hybrid fibre-coaxial Image scaling Ions Kind of quantity - Equilibrium Megahertz Numerous Offset binary Plasma Active Test scaling Toroidal graph
Content Type	Text
Resource Type	Article

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