First measurements of electron temperature and density with divertor Thomson Scattering in radiative divertor discharges on DIII-D

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We have obtained the first measurements of n{sub e} and T{sub e} in the DIII-D divertor region with a multi-pulse (20 Hz) Divertor Thomson Scattering (DTS) system. Eight measurement locations are distributed vertically up to 21 cm above the divertor plate. Two-dimensional distributions have been obtained by sweeping the divertor plasma across the DTS measurement location. Several operating modes have been studied, including ohmic, L-mode, Elming H-mode, and Radiative Divertor operation with puffing of D{sub 2} and impurities. Mapping of the data to either the (L{sub pol}, {phi}) or (R, Z) planes with the EFIT equilibrium is used to analyze ... continued below

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20 p.

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Allen, S. L.; Hill, D. N.; Carlstrom, T. N. & Nilson, D. G. October 1, 1996.

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We have obtained the first measurements of n{sub e} and T{sub e} in the DIII-D divertor region with a multi-pulse (20 Hz) Divertor Thomson Scattering (DTS) system. Eight measurement locations are distributed vertically up to 21 cm above the divertor plate. Two-dimensional distributions have been obtained by sweeping the divertor plasma across the DTS measurement location. Several operating modes have been studied, including ohmic, L-mode, Elming H-mode, and Radiative Divertor operation with puffing of D{sub 2} and impurities. Mapping of the data to either the (L{sub pol}, {phi}) or (R, Z) planes with the EFIT equilibrium is used to analyze the 2D profiles. We find that in ELMing H-mode: n{sub e}, T{sub e}, and P{sub e} are relatively constant along field lines from the X-point to the divertor plate, especially near the separatrix field line. With D{sub 2} puffing, the DTS profiles indicate that T{sub e} in a large part of divertor region below the X-point is dramatically reduced from {approximately}30-40 eV in ELMing H-mode to 1-2 eV. This results in a fairly uniform low-T{sub e} divertor, with an increased electron density in the range of 2 to 4 x 10{sup 20} m{sup -3}. Detailed comparisons of the spatial profiles of n{sub e}, T{sub e}, and electron pressure P{sub e}, are presented for several operating modes. In addition, these data are compared with initial calculations from the UEDGE fluid code.

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20 p.

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INIS; OSTI as DE97003854

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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: DE97003854
  • Report No.: GA--A22357
  • Report No.: CONF-960569--22
  • Grant Number: AC03-89ER51114;AC05-96OR22464;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 464168
  • Archival Resource Key: ark:/67531/metadc675880

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  • October 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Aug. 1, 2016, 6:45 p.m.

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Allen, S. L.; Hill, D. N.; Carlstrom, T. N. & Nilson, D. G. First measurements of electron temperature and density with divertor Thomson Scattering in radiative divertor discharges on DIII-D, article, October 1, 1996; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc675880/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.