Comparison of a {del}B drift effect model with measured H-mode power thresholds

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The H-mode power threshold has a weak but positive B{sub T} dependence when the ion {del}B drift is away from the X-point, in contrast to the nearly linear B{sub T} dependence when the ion {del}B drift is toward the X-point. This indicates that geometry plays an important role in the H-mode power threshold scaling. A simple model of the {del}B drift effect failed to predict this behavior, but successfully predicted the sign change of gas puffing and low X-point height on the power threshold. The difference between the threshold power required for sawtooth and nonsawtooth triggered transitions can be substantial. ... continued below

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13 p.

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Carlstrom, T.N.; Burrell, K.H. & Groebner, R.J. September 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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The H-mode power threshold has a weak but positive B{sub T} dependence when the ion {del}B drift is away from the X-point, in contrast to the nearly linear B{sub T} dependence when the ion {del}B drift is toward the X-point. This indicates that geometry plays an important role in the H-mode power threshold scaling. A simple model of the {del}B drift effect failed to predict this behavior, but successfully predicted the sign change of gas puffing and low X-point height on the power threshold. The difference between the threshold power required for sawtooth and nonsawtooth triggered transitions can be substantial. This effect may contribute to the observed B scaling of the H-mode power threshold.

Physical Description

13 p.

Notes

INIS; OSTI as DE98001003

Source

  • US/Japan workshop on H-mode physics and 6th H-mode workshop, Kloster Seeon (Germany), 22-24 Sep 1997

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  • Other: DE98001003
  • Report No.: GA--A22696
  • Report No.: CONF-9709100--
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 548759
  • Archival Resource Key: ark:/67531/metadc691522

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 18, 2016, 5:57 p.m.

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Carlstrom, T.N.; Burrell, K.H. & Groebner, R.J. Comparison of a {del}B drift effect model with measured H-mode power thresholds, article, September 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc691522/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.