Radiative and SOL experiments in open and baffled divertors on DIII-D

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The authors present recent progress towards an understanding of the physical processes in the divertor and scrape-off-layer (SOL) plasmas in DIII-D. This has been made possible by a combination of new diagnostics, improved computational models, and changes in divertor geometry. They have focused primarily on ELMing H-mode discharges. The physics of Partially Detached Divertor (PDD) plasmas, with divertor heat flux reduction by divertor radiation enhancement using D{sub 2} puffing, has been studied in 2-D, and a model of the heat and particle transport has been developed that includes conduction, convection, ionization, recombination, and flows. Plasma and impurity particle flows have ... continued below

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28 p.

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Allen, S.L.; Brooks, N.H. & Bastasz, R. November 1, 1998.

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  • Allen, S.L. Lawrence Livermore National Lab., CA (United States)
  • Brooks, N.H. General Atomics, San Diego, CA (United States)
  • Bastasz, R. Sandia National Lab., Livermore, CA (United States)

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Description

The authors present recent progress towards an understanding of the physical processes in the divertor and scrape-off-layer (SOL) plasmas in DIII-D. This has been made possible by a combination of new diagnostics, improved computational models, and changes in divertor geometry. They have focused primarily on ELMing H-mode discharges. The physics of Partially Detached Divertor (PDD) plasmas, with divertor heat flux reduction by divertor radiation enhancement using D{sub 2} puffing, has been studied in 2-D, and a model of the heat and particle transport has been developed that includes conduction, convection, ionization, recombination, and flows. Plasma and impurity particle flows have been measured with Mach probes and spectroscopy and these flows have been compared with the UEDGE model. The model now includes self-consistent calculations of carbon impurities. Impurity radiation has been increased in the divertor and SOL with puff and pump techniques using SOL D{sub 2} puffing, divertor cryopumping, and argon puffing. The important physical processes in plasma-wall interactions have been examined with a DiMES probe, plasma characterization near the divertor plate, and the REDEP code. Experiments comparing single-null (SN) plasma operation in baffled and open divertors have demonstrated a change in the edge plasma profiles. These results are consistent with a reduction in the core ionization source calculated with UEDGE. Divertor particle control in ELMing H-mode with pumping and baffling has resulted in reduction in H-mode core densities to n{sub e}/n{sub gw} {approx} 0.25. Divertor particle exhaust and heat flux has been studied as the plasma shape was varied from a lower SN, to a balanced double null (DN), and finally to an upper SN.

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28 p.

Notes

INIS; OSTI as DE99001350

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

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  • Other: DE99001350
  • Report No.: GA--A23004
  • Report No.: CONF-981064--
  • Grant Number: AC03-89ER51114;W-7405-ENG-48;AC05-96OR22464;AC04-94AL85000;FG03-92ER54150
  • Office of Scientific & Technical Information Report Number: 296835
  • Archival Resource Key: ark:/67531/metadc679087

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  • November 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 1, 2016, 6:38 p.m.

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Allen, S.L.; Brooks, N.H. & Bastasz, R. Radiative and SOL experiments in open and baffled divertors on DIII-D, article, November 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc679087/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.