H-mode threshold power scaling and the {gradient}B drift effect

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One of the largest influences on the H-mode power threshold (P{sub TH}) is the direction of the ion {gradient}B drift relative to the X-point location, where factors of 2--3 increase in P{sub TH} are observed for the ion {gradient}B drift away from the X-point. It is proposed that the threshold power scaling observed in single-null configurations with the ion {gradient}B drift toward the X-point location (P{sub TH} {approximately} nB, where n is the plasma density, and B is the toroidal field) is due to the scaling of the magnitude of the {gradient}B drift effect. Hinton and later Hinton and Stebler ... continued below

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7 p.

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Carlstrom, T.N.; Burrell, K.H.; Groebner, R.J. & Staebler, G.M. June 1, 1997.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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One of the largest influences on the H-mode power threshold (P{sub TH}) is the direction of the ion {gradient}B drift relative to the X-point location, where factors of 2--3 increase in P{sub TH} are observed for the ion {gradient}B drift away from the X-point. It is proposed that the threshold power scaling observed in single-null configurations with the ion {gradient}B drift toward the X-point location (P{sub TH} {approximately} nB, where n is the plasma density, and B is the toroidal field) is due to the scaling of the magnitude of the {gradient}B drift effect. Hinton and later Hinton and Stebler have modeled this effect as neoclassical cross field fluxes of both heat and particles driven by poloidal temperature gradients on the open field lines in the scrape-off layer (SOL). The {gradient}B drift effect influences the power threshold by affecting the edge conditions needed for the L-H transition. It is not essential for the L-H transition itself since transitions are observed with either direction of B. Predictions of this model include saturation of the B scaling of P{sub TH} at high field, 1/B scaling of P{sub TH} with reverse B, and no B scaling of P{sub TH} in balanced double-null configurations. This last prediction is consistent with the observed scaling of p{sub TH} in double-null plasma sin DIII-D.

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7 p.

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INIS; OSTI as DE97007382

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  • 24. EPS conference on controlled fusion and plasma physics, Berchtesgaden (Germany), 9-13 Jun 1997

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  • Other: DE97007382
  • Report No.: GA-A--22630
  • Report No.: CONF-9706131--6
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 505396
  • Archival Resource Key: ark:/67531/metadc694735

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  • June 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 18, 2016, 6:05 p.m.

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Carlstrom, T.N.; Burrell, K.H.; Groebner, R.J. & Staebler, G.M. H-mode threshold power scaling and the {gradient}B drift effect, article, June 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc694735/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.