Characteristics of the First H-mode Discharges in NSTX

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Description

We report observations of the first low-to-high (L-H) confinement mode transitions in the National Spherical Torus Experiment (NSTX). The H-mode energy confinement time increased over reference L-mode discharges transiently by 100-300%, as high as {approximately}150 ms. This confinement time is {approximately}1.8-2.3 times higher than predicted by a multi-machine ELM-free H-mode scaling. This achievement extends the H-mode window of fusion devices down to a record low aspect ratio (R/a) {approximately} 1.3, challenging both confinement and L-H power thresholds scalings based on conventional aspect ratio tokamaks.

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420 Kilobytes pages

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Maingi, R.; Bell, M.G.; Bell, R.E.; Bush, C.E.; Fredrickson, E.D.; Gates, D.A. et al. May 10, 2001.

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Description

We report observations of the first low-to-high (L-H) confinement mode transitions in the National Spherical Torus Experiment (NSTX). The H-mode energy confinement time increased over reference L-mode discharges transiently by 100-300%, as high as {approximately}150 ms. This confinement time is {approximately}1.8-2.3 times higher than predicted by a multi-machine ELM-free H-mode scaling. This achievement extends the H-mode window of fusion devices down to a record low aspect ratio (R/a) {approximately} 1.3, challenging both confinement and L-H power thresholds scalings based on conventional aspect ratio tokamaks.

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420 Kilobytes pages

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INIS; OSTI as DE00784549

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  • Other Information: PBD: 10 May 2001

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  • Report No.: PPPL-3563
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/784549 | External Link
  • Office of Scientific & Technical Information Report Number: 784549
  • Archival Resource Key: ark:/67531/metadc725099

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  • May 10, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 8:32 p.m.

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Maingi, R.; Bell, M.G.; Bell, R.E.; Bush, C.E.; Fredrickson, E.D.; Gates, D.A. et al. Characteristics of the First H-mode Discharges in NSTX, report, May 10, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc725099/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.