Effect of Gas Fueling Location on H-mode Access in NSTX

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The dependence of H-mode access on the poloidal location of the gas injection source has been investigated in the National Spherical Torus Experiment (NSTX). We find that gas fueling from the center stack midplane area produces the most reproducible H-mode access with generally the lowest L-H threshold power in lower single-null configuration. The edge toroidal rotation velocity is largest (in direction of the plasma current) just before the L-H transition with center stack midplane fueling, and then reverses direction after the L-H transition. Simulation of these results with a 2-D guiding-center Monte Carlo neoclassical transport code is qualitatively consistent with ... continued below

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972 Kilobytes pages

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Maingi, R.; Bell, M.; Bell, R.; Biewer, T.; Bush, C.; Chang, C.S. et al. October 9, 2003.

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Description

The dependence of H-mode access on the poloidal location of the gas injection source has been investigated in the National Spherical Torus Experiment (NSTX). We find that gas fueling from the center stack midplane area produces the most reproducible H-mode access with generally the lowest L-H threshold power in lower single-null configuration. The edge toroidal rotation velocity is largest (in direction of the plasma current) just before the L-H transition with center stack midplane fueling, and then reverses direction after the L-H transition. Simulation of these results with a 2-D guiding-center Monte Carlo neoclassical transport code is qualitatively consistent with the trends in the measured velocities. Double-null discharges exhibit H-mode access with gas fueling from either the center stack midplane or center stack top locations, indicating a reduced sensitivity of H-mode access on fueling location in that shape.

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972 Kilobytes pages

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INIS; OSTI as DE00820105

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  • Other Information: PBD: 9 Oct 2003

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  • Report No.: PPPL-3883
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/820105 | External Link
  • Office of Scientific & Technical Information Report Number: 820105
  • Archival Resource Key: ark:/67531/metadc737759

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  • October 9, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 9:58 p.m.

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Maingi, R.; Bell, M.; Bell, R.; Biewer, T.; Bush, C.; Chang, C.S. et al. Effect of Gas Fueling Location on H-mode Access in NSTX, report, October 9, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc737759/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.