Divertor heat flux reduction by D sub 2 injection in DIII-D

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D{sub 2} gas injected into ELMing H-mode discharges in DIII-D reduced total integrated heat flux to the divertor by {approximately}2{times} and peak heat flux by {approximately}5{times}, with only modest degradation to plasma stored energy. Steady gas injection without particle pumping results in eventual degradation in stored energy. The initial reduction in peak heat flux at the divertor tiles may be primarily due to the increase in radiated power from the X-point/divertor region. The eventual formation of a high density region near the X-point appears to play a role in momentum (and energy) transfer from the flux surfaces near the outboard ... continued below

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Pages: (18 p)

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Petrie, T.W.; Groebner, R.J.; Leonard, A.W.; Lippmann, S.I.; Mahdavi, A.M.; West, W.P. (General Atomics, San Diego, CA (United States)) et al. May 1, 1992.

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D{sub 2} gas injected into ELMing H-mode discharges in DIII-D reduced total integrated heat flux to the divertor by {approximately}2{times} and peak heat flux by {approximately}5{times}, with only modest degradation to plasma stored energy. Steady gas injection without particle pumping results in eventual degradation in stored energy. The initial reduction in peak heat flux at the divertor tiles may be primarily due to the increase in radiated power from the X-point/divertor region. The eventual formation of a high density region near the X-point appears to play a role in momentum (and energy) transfer from the flux surfaces near the outboard strike point to flux surfaces farther out into the scrapeoff. This may also contribute to further reduction in peak heat flux.

Physical Description

Pages: (18 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 10. international conference on plasma-surface interactions in controlled fusion devices, Monterey, CA (United States), 30 Mar - 3 Apr 1992

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  • Other: DE92014232
  • Report No.: GA-A-20899
  • Report No.: CONF-920311--12
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 5222469
  • Archival Resource Key: ark:/67531/metadc1071230

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1992

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 2, 2018, 5:24 p.m.

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Petrie, T.W.; Groebner, R.J.; Leonard, A.W.; Lippmann, S.I.; Mahdavi, A.M.; West, W.P. (General Atomics, San Diego, CA (United States)) et al. Divertor heat flux reduction by D sub 2 injection in DIII-D, article, May 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc1071230/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.