Status of Advanced Tokamak Scenario Modeling with Off-Axis Electron Cyclotron Current Drive in DIII-D

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The status of modeling work focused on developing the advanced tokamak scenarios in DIII-D is discussed. The objectives of the work are two-fold: (1) to develop AT scenarios with ECCD using time-dependent transport simulations, coupled with heating and current drive models, consistent with MHD equilibrium and stability; and (2) to use time-dependent simulations to help plan experiments and to understand the key physics involved. Time-dependent simulations based on transport coefficients derived from experimentally achieved target discharges are used to perform AT scenario modeling. The modeling indicates off-axis ECCD with approximately 3 MW absorbed power can maintain high-performance discharges with q{sub ... continued below

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Murakami, M.; St.John, H.E.; Casper, T.A.; Chu, M.S.; DeBoo, J.C.; Greenfield, C.M. et al. December 1, 1999.

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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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The status of modeling work focused on developing the advanced tokamak scenarios in DIII-D is discussed. The objectives of the work are two-fold: (1) to develop AT scenarios with ECCD using time-dependent transport simulations, coupled with heating and current drive models, consistent with MHD equilibrium and stability; and (2) to use time-dependent simulations to help plan experiments and to understand the key physics involved. Time-dependent simulations based on transport coefficients derived from experimentally achieved target discharges are used to perform AT scenario modeling. The modeling indicates off-axis ECCD with approximately 3 MW absorbed power can maintain high-performance discharges with q{sub min} > 1 for 5 to 10 s. The resultant equilibria are calculated to be stable to n = 1 pressure driven modes. The plasma is well into the second stability regime for high-n ballooning modes over a large part of the plasma volume. The role of continuous localized ECCD is studied for stabilizing m/n = 2/1 tearing modes. The progress towards validating current drive and transport models, consistent with experimental results, and developing self-consistent, integrated high performance AT scenarios is discussed.

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Medium: P; Size: vp.

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INIS; OSTI as DE00766945

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  • 2nd IAEA Technical Committee Meeting on Steady-State Operation of Magnetic Fusion Devices, Fukuoka (JP), 10/25/1999--10/29/1999

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  • Report No.: GA-A23310
  • Grant Number: AC03-99ER54463
  • Grant Number: AC05-96OR22464
  • Grant Number: W-7405-ENG-48
  • Grant Number: FG03-95ER54309
  • Office of Scientific & Technical Information Report Number: 766945
  • Archival Resource Key: ark:/67531/metadc723932

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  • December 1, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 18, 2016, 6:08 p.m.

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Murakami, M.; St.John, H.E.; Casper, T.A.; Chu, M.S.; DeBoo, J.C.; Greenfield, C.M. et al. Status of Advanced Tokamak Scenario Modeling with Off-Axis Electron Cyclotron Current Drive in DIII-D, article, December 1, 1999; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc723932/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.