Divertor pumping and other reactor application issues for H-mode

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We summarize results from DIII-D in regard to issues for reactor application of H-mode. Recently, DIII-D has begun to operate a cryopump (D{sub 2} pumping speed = 31,000 {ell}/s at a pressure of 2 mTorr). Initial results are very favorable for density control in H-mode. The plasma density could be reduced by 50%. Energy confinement is unchanged so the temperature rises in proportion to the density drop. Ability to access these less collisional plasmas in H-mode is favorable to current drive application. With the all-graphite wall, impurity accumulation has been eliminated. The exceedingly good confinement of VH-mode offers the possibility ... continued below

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8 p.

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Stambaugh, R.D.; Brooks, N.H. & Allen, S.L. January 1, 1994.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

We summarize results from DIII-D in regard to issues for reactor application of H-mode. Recently, DIII-D has begun to operate a cryopump (D{sub 2} pumping speed = 31,000 {ell}/s at a pressure of 2 mTorr). Initial results are very favorable for density control in H-mode. The plasma density could be reduced by 50%. Energy confinement is unchanged so the temperature rises in proportion to the density drop. Ability to access these less collisional plasmas in H-mode is favorable to current drive application. With the all-graphite wall, impurity accumulation has been eliminated. The exceedingly good confinement of VH-mode offers the possibility of retaining good confinement while radiating copious power from the plasma edge using injected noble gas impurities.

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8 p.

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INIS; OSTI as DE94007431

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  • IAEA meeting on H-mode physics, Naka (Japan), 15-17 Nov 1993

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  • Other: DE94007431
  • Report No.: GA-A--21542
  • Report No.: CONF-9311147--3
  • Grant Number: AC03-89ER51114;W-7405-ENG-48;AC05-84OR21400;AC04-76DP00789;FG03-89ER51121
  • Office of Scientific & Technical Information Report Number: 143979
  • Archival Resource Key: ark:/67531/metadc622156

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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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  • January 1, 1994

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  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 6 p.m.

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Stambaugh, R.D.; Brooks, N.H. & Allen, S.L. Divertor pumping and other reactor application issues for H-mode, article, January 1, 1994; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc622156/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.