Studies of high-{delta} (baffled) and low-{delta} (open) pumped divertor operation on DIII-D

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The authors report new experimental results with the RDP-OB (Radiative Divertor Project-outer baffle) and cryopump in both upper single-null (USN) and double-null (DN) ELMing H-mode discharges. The baffled divertor reduced the core ionization ({approximately}2--2.5{times}), in reasonable agreement with predictions from UEDGE/DEGAS modeling ({approximately}3.75{times}). The upper cryopump achieved density control of n{sub e}/n{sub gw} {approximately} 0.22 (line density/Greenwald density) with Z{sub eff} {approximately} 2 in high-{delta} plasmas. The measured exhaust is comparable to the lower pump, except at lower core electron densities (n{sub e} < 5 {times} 10{sup 19} m{sup {minus}3}). Efficient impurity exhaust was obtained with deuterium SOL flow. Preliminary ... continued below

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22 p.

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Allen, S. L.; Fenstermacher, M. E. & Greenfield, C. M. August 1, 1998.

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Description

The authors report new experimental results with the RDP-OB (Radiative Divertor Project-outer baffle) and cryopump in both upper single-null (USN) and double-null (DN) ELMing H-mode discharges. The baffled divertor reduced the core ionization ({approximately}2--2.5{times}), in reasonable agreement with predictions from UEDGE/DEGAS modeling ({approximately}3.75{times}). The upper cryopump achieved density control of n{sub e}/n{sub gw} {approximately} 0.22 (line density/Greenwald density) with Z{sub eff} {approximately} 2 in high-{delta} plasmas. The measured exhaust is comparable to the lower pump, except at lower core electron densities (n{sub e} < 5 {times} 10{sup 19} m{sup {minus}3}). Efficient impurity exhaust was obtained with deuterium SOL flow. Preliminary experiments with DN operation has shown that the particle exhaust to the upper pump depends on the up/down magnetic balance. Preliminary experiments indicate that the DN exhaust is roughly 40--50% of the USN exhaust at n{sub e} {approximately} 4 {times} 10{sup 19} m{sup {minus}3}.

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22 p.

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INIS; OSTI as DE98006223

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  • 13. international conference on plasma surface interactions, San Diego, CA (United States), 18-22 May 1998

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  • Other: DE98006223
  • Report No.: GA--A22878
  • Report No.: CONF-980560--
  • Grant Number: AC03-89ER51114;AC05-96OR22464;AC04-94AL85000;FG03-95ER54294;W-7405-ENG-48
  • DOI: 10.2172/639804 | External Link
  • Office of Scientific & Technical Information Report Number: 639804
  • Archival Resource Key: ark:/67531/metadc694694

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  • August 1, 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 1, 2016, 6:40 p.m.

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Allen, S. L.; Fenstermacher, M. E. & Greenfield, C. M. Studies of high-{delta} (baffled) and low-{delta} (open) pumped divertor operation on DIII-D, report, August 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc694694/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.