Comprehensive 2D measurements of radiative divertor plasmas in DIII-D

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This paper presents a comparison of the total radiated power profile and impurity line emission distributions in the SOL and divertor of DIII-D. This is done for ELMing H-mode plasmas with heavy deuterium injection (Partially Detached Divertor operation, PDD) and those without deuterium puffing. Results are described from a series of dedicated experiments performed on DIII-D to systematically measure the 2-D (R,Z) structure of the divertor plasma. The discharges were designed to optimize measurements with new divertor diagnostics including a divertor Thomson scattering system. Discharge sequences were designed to produce optimized data sets against which SOL and divertor theories and ... continued below

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16 p.

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Fenstermacher, M.E.; Wood, R.D.; Allen, S.L. & Hill, D.N. July 1, 1997.

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Description

This paper presents a comparison of the total radiated power profile and impurity line emission distributions in the SOL and divertor of DIII-D. This is done for ELMing H-mode plasmas with heavy deuterium injection (Partially Detached Divertor operation, PDD) and those without deuterium puffing. Results are described from a series of dedicated experiments performed on DIII-D to systematically measure the 2-D (R,Z) structure of the divertor plasma. The discharges were designed to optimize measurements with new divertor diagnostics including a divertor Thomson scattering system. Discharge sequences were designed to produce optimized data sets against which SOL and divertor theories and simulation codes could be benchmarked. During PDD operation the regions of significant radiated power shift from the inner divertor leg and SOL to the outer leg and X-point regions. D{alpha} emission shifts from the inner strikepoint to the outer strikepoint. Carbon emissions (visible CII and CIII) shift from the inner SOL near the X-point to a distributed region from the X-point to partially down the outer leg during moderate D2 puffing. In heavy puffing discharges the carbon emission coalesces on the outer separatrix near the X-point and for very heavy puffing it appears inside the last closed flux surface above the X-point. Calibrated spectroscopic measurements indicate that hydrogenic and carbon radiation can account for all of the radiated power. L{alpha} and CIV radiation are comparable and when combined account for as much as 90% of the total radiated power along chords viewing the significant radiating regions of the outer leg.

Physical Description

16 p.

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INIS; OSTI as DE97007894

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  • 12. international conference on plasma surface interactions in controlled fusion devices, Saint-Raphael (France), 20-26 May 1996

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  • Other: DE97007894
  • Report No.: GA--A22347
  • Report No.: CONF-960569--24
  • Grant Number: AC03-89ER51114;AC04-94AL85000;AC05-96OR22464;FG05-88ER53266;FG03-95ER54294;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 516054
  • Archival Resource Key: ark:/67531/metadc693759

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 2, 2016, 5:46 p.m.

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Fenstermacher, M.E.; Wood, R.D.; Allen, S.L. & Hill, D.N. Comprehensive 2D measurements of radiative divertor plasmas in DIII-D, article, July 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc693759/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.