Confinement and stability of DIII-D negative central shear discharges

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Negative central magnetic shear (NCS) discharges with {Beta}{sub N} {le} 4, H {le} 3, and up to 80% of the current non-inductively driven are reproducibly produced in the DIII-D tokamak. Strong peaking of T{sub i}, plasma rotation, and in some cases n{sub e} are observed inside the NCS region. Transport analysis shows that the core ion thermal diffusivity is substantially reduced and near the neoclassical value after the formation of the internal transport barrier. The negative central shear is necessary but not sufficient for the formation of this transport barrier. The power required for the formation appears to increase with ... continued below

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4 p.

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Lao, L.L.; Burrell, K.H. & Chan, V.S. December 1, 1995.

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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

Negative central magnetic shear (NCS) discharges with {Beta}{sub N} {le} 4, H {le} 3, and up to 80% of the current non-inductively driven are reproducibly produced in the DIII-D tokamak. Strong peaking of T{sub i}, plasma rotation, and in some cases n{sub e} are observed inside the NCS region. Transport analysis shows that the core ion thermal diffusivity is substantially reduced and near the neoclassical value after the formation of the internal transport barrier. The negative central shear is necessary but not sufficient for the formation of this transport barrier. The power required for the formation appears to increase with the toroidal magnetic field. The high performance phase of H-mode NCS discharges often ends with an ELM-like collapse initiated from the edge whereas the L-mode discharges which have a more peaked pressure profile tend to end with a more global n = 1 MHD event.

Physical Description

4 p.

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INIS; OSTI as DE96005246

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  • IAEA technical committee meeting/ US-Japan workshop on H-mode physics, Princeton, NJ (United States), 18-20 Sep 1995

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  • Other: DE96005246
  • Report No.: GA--A22198
  • Report No.: CONF-9509238--5
  • Grant Number: AC03-89ER51114;FG03-95ER54309;FG02-89ER53297;FG05-88ER53266;AC05-84OR21400;AC02-76CH03073;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 192510
  • Archival Resource Key: ark:/67531/metadc669719

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  • December 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 18, 2016, 5:57 p.m.

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Lao, L.L.; Burrell, K.H. & Chan, V.S. Confinement and stability of DIII-D negative central shear discharges, article, December 1, 1995; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc669719/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.