Impurity control studies using SOL flow in DIII-D

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Experiments on DIII-D have demonstrated the efficacy of using induced scrape-off-layer (SOL) flow to preferentially enrich impurities in the divertor plasma. This SOL flow is produced through simultaneous deuterium gas injection at the midplane and divertor exhaust. Using this SOL flow, an improvement in enrichment (defined as the ratio of impurity fraction in the divertor to that in the plasma core) has been observed for all impurities in trace-level experiments (i.e., impurity level is non-perturbative), with the degree of improvement increasing with impurity atomic number. In the case of argon, exhaust gas enrichment using a modest SOL flow is as ... continued below

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5 p.

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Wade, M.R.; Hogan, J.T. & Isler, R.C. November 1, 1998.

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Description

Experiments on DIII-D have demonstrated the efficacy of using induced scrape-off-layer (SOL) flow to preferentially enrich impurities in the divertor plasma. This SOL flow is produced through simultaneous deuterium gas injection at the midplane and divertor exhaust. Using this SOL flow, an improvement in enrichment (defined as the ratio of impurity fraction in the divertor to that in the plasma core) has been observed for all impurities in trace-level experiments (i.e., impurity level is non-perturbative), with the degree of improvement increasing with impurity atomic number. In the case of argon, exhaust gas enrichment using a modest SOL flow is as high as 17. Using this induced SOL flow technique and argon injection, radiative ELMing H-mode plasmas have been produced that combine high radiation losses (P{sub rad}/P{sub input} > 70%), low core fuel dilution (Z{sub eff} < 1.9), and good core confinement ({tau}{sub E} > 1.0 {tau}{sub E},ITER93H).

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5 p.

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INIS; OSTI as DE99001957

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  • 17. IAEA fusion energy conference, Yokohama (Japan), 19-24 Oct 1998

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  • Other: DE99001957
  • Report No.: GA--A23001
  • Report No.: CONF-981064--
  • Grant Number: AC03-99ER54463;AC05-96OR22464;W-7405-ENG-48;AC04-94AL85000;FG03-95ER54294
  • DOI: 10.2172/319793 | External Link
  • Office of Scientific & Technical Information Report Number: 319793
  • Archival Resource Key: ark:/67531/metadc681219

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  • November 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 1, 2016, 6:46 p.m.

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Wade, M.R.; Hogan, J.T. & Isler, R.C. Impurity control studies using SOL flow in DIII-D, report, November 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc681219/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.