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Accession Number DE2013-1022030
Title Characterization of H-Mode Discharges in NSTX.
Publication Date 2012
Media Count 4p
Personal Author B. P. LeBlanc C. E. Bush D. Mueller D. Stutman D. A. Gates D. W. Johnson E. D. Fredrickson G. Taylor H. W. Kugel J. E. Menard M. G. Bell R. Maingi R. E. Bell S. A. Sabbagh S. M. Kaye
Abstract We report the observation of the first H-mode transitions in the National Spherical Torus Experiment (NSTX). Energy confinement time transiently increased by more than a factor of 2, to order 100 ms. The heating power requirement for accessing the H-mode regime (power threshold) was significantly higher than predicted by a multi-machine database compiled from conventional aspect ratio tokamaks. Our power threshold results are similar to other STs, such as the START and MAST machines. These H-mode observations in STs challenge and extend the existing international power threshold and energy confinement time scalings based on conventional aspect ratio tokamaks. The remainder of this paper discusses characteristics of the H-modes in NSTX.
Keywords Aspect ratio
Confinement time
H-mode plasma confinement
NSTX devices
Tokamak devices

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 77G - Radioactive Wastes & Radioactivity
46G - Plasma Physics
Corporate Author Oak Ridge National Lab., TN.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1323
Contract Number DE-AC05-00OR22725

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