RI-mode investigations in the DIII-D tokamak with neon and argon induced radiating mantles

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The RI-mode regime, with high radiating power fractions from 0.5 to 0.9, energy confinement enhancements, H{sub 89P}, over ITER89-P L-mode scaling greater than 1.6, and operation at or above the Greenwald density limit (n{sub GW}) is an attractive operating scenario for future fusion burning plasma devices. The TEXTOR tokamak has demonstrated this scenario in a limiter device with steady state conditions, {Delta}t{sub RI-mode}/{tau}{sub E} > 100. Studies have been initiated on the DIII-D tokamak with the goals of: (a) extending these results to a larger non circular machine (providing size and shape scaling), (b) investigating the underlying physical mechanisms of ... continued below

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5 p.

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Jackson, G.L.; Staebler, G.M. & Murakami, M. July 1, 1998.

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The RI-mode regime, with high radiating power fractions from 0.5 to 0.9, energy confinement enhancements, H{sub 89P}, over ITER89-P L-mode scaling greater than 1.6, and operation at or above the Greenwald density limit (n{sub GW}) is an attractive operating scenario for future fusion burning plasma devices. The TEXTOR tokamak has demonstrated this scenario in a limiter device with steady state conditions, {Delta}t{sub RI-mode}/{tau}{sub E} > 100. Studies have been initiated on the DIII-D tokamak with the goals of: (a) extending these results to a larger non circular machine (providing size and shape scaling), (b) investigating the underlying physical mechanisms of RI-mode with a complementary diagnostic set to that on TEXTOR, and (c) using non-intrinsic impurities, e.g., neon and argon, to obtain high performance diverted discharges, ({beta}{sub N}H{sub 89P} > 6) in support of the DIII-D advanced tokamak (AT) program, where {beta}{sub N} = {beta}{sub T}/(I{sub p}/aB{sub T}) and {beta}{sub T}, I{sub p}, a, and B{sub T} are toroidal beta (in %), plasma current (MA), minor radius (m), and toroidal magnetic field (T) respectively. The authors define P{sub radLCFS} as the radiated power inside the LCFS and note that nearly all of this radiation occurs in the mantle region 0.6 < {rho} < 1.0, i.e., P{sub mantle} {approx} P{sub radLCFS}. Three types of DIII-D discharges where mantle radiation plays a significant role are discussed in this paper: (i) ELMing H-mode puff and pump, (ii) limiter L-mode, and (III) high performance.

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5 p.

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INIS; OSTI as DE98007258

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  • 25. European Physical Society conference on controlled fusion and plasma physics, Prague (Czech Republic), 29 Jun - 3 Jul 1998

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  • Other: DE98007258
  • Report No.: GA--A22911
  • Report No.: CONF-980678--
  • Grant Number: AC03-89ER51114;AC05-96OR22464;FG03-95ER54294;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 638249
  • Archival Resource Key: ark:/67531/metadc693992

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  • July 1, 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 1, 2016, 6:39 p.m.

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Jackson, G.L.; Staebler, G.M. & Murakami, M. RI-mode investigations in the DIII-D tokamak with neon and argon induced radiating mantles, article, July 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc693992/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.