Stability and Confinement Properties of Auxiliary Heated NSTX Discharges

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The National Spherical Torus Experiment (NSTX) is a spherical tokamak with nominal plasma major radius R(subscript ''0'') = 0.85 m, minor radius a = 0.66 m, and aspect ratio A > 1.28. Typical discharge parameters are plasma current I (subscript ''p'') = 0.7-1.4 MA, toroidal magnetic field B(subscript ''t0'') = 0.25-0.45 Tesla at major radius R(subscript ''0''), elongation = 1.7-2.2, triangularity 0.3-0.5, line-average electron density = 2-5 x 10(superscript ''19'') m(superscript ''-3''), electron temperature T(subscript ''e'')(0) = 0.5-1.5 keV, and ion temperature T(subscript ''i'')(0) = 0.5-2 keV. The NSTX auxiliary heating systems can routinely deliver 4.5 MW of 80-keV deuterium ... continued below

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390 Kilobytes pages

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Menard, J.E.; R.E.Bell; Bourdelle, C.; Darrow, D.S.; Fredrickson, E.D.; Gates, D.A. et al. July 5, 2001.

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Description

The National Spherical Torus Experiment (NSTX) is a spherical tokamak with nominal plasma major radius R(subscript ''0'') = 0.85 m, minor radius a = 0.66 m, and aspect ratio A > 1.28. Typical discharge parameters are plasma current I (subscript ''p'') = 0.7-1.4 MA, toroidal magnetic field B(subscript ''t0'') = 0.25-0.45 Tesla at major radius R(subscript ''0''), elongation = 1.7-2.2, triangularity 0.3-0.5, line-average electron density = 2-5 x 10(superscript ''19'') m(superscript ''-3''), electron temperature T(subscript ''e'')(0) = 0.5-1.5 keV, and ion temperature T(subscript ''i'')(0) = 0.5-2 keV. The NSTX auxiliary heating systems can routinely deliver 4.5 MW of 80-keV deuterium neutral beams and 3 MW of 30-MHz high-harmonic fast-wave power. Kinetic profile diagnostics presently include a 10-channel, 30-Hz multipulse Thomson scattering system (MPTS), a 17-channel charge-exchange recombination spectroscopy (CHERS) system, a 48-chord ultra-soft X-ray (USXR) array, and a 15-chord bolometry array. Initial experiments utilizing auxiliary heating on NSTX have focused on MHD stability limits, confinement trends, studying H-mode characteristics, and performing initial power balance calculations.

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390 Kilobytes pages

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INIS; OSTI as DE00787717

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  • Other Information: PBD: 5 Jul 2001

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  • Report No.: PPPL-3587
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/787717 | External Link
  • Office of Scientific & Technical Information Report Number: 787717
  • Archival Resource Key: ark:/67531/metadc716980

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  • July 5, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 9:54 p.m.

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Menard, J.E.; R.E.Bell; Bourdelle, C.; Darrow, D.S.; Fredrickson, E.D.; Gates, D.A. et al. Stability and Confinement Properties of Auxiliary Heated NSTX Discharges, report, July 5, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc716980/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.