Spreading of wave-driven currents in a tokamak

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Description

Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current and power using a diffusion-Eke equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D{sub fast} ... continued below

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9 p.

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Ignat, D. W.; Kaita, R.; Jardin, S. C. & Okabayashi, M. January 1996.

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Description

Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current and power using a diffusion-Eke equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D{sub fast} {approx} 1.0 m{sup 2}/s. Such a value for D{sub fast} is in the range suggested by other work.

Physical Description

9 p.

Notes

INIS; OSTI as DE96007506

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  • Other Information: PBD: Jan 1996

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  • Other: DE96007506
  • Report No.: PPPL--3158
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/206597 | External Link
  • Office of Scientific & Technical Information Report Number: 206597
  • Archival Resource Key: ark:/67531/metadc669912

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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 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 15, 2016, 7:10 p.m.

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Ignat, D. W.; Kaita, R.; Jardin, S. C. & Okabayashi, M. Spreading of wave-driven currents in a tokamak, report, January 1996; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc669912/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.