Plasma rotation, dynamo, and nonlinear coupling in the reversed field pinch

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Two important effects of MHD fluctuations in the RFP and tokamak are current generation (the dynamo effect) and mode locking. In the T1 and MST RFP experiments new results reveal the mode dynamics underlying these phenomena. In T1 the effect of specific magnetic Fourier modes on the current density profile is evident. In MST, the MHD dynamo term ({delta}v x {delta}B) is measured in the plasma edge, and found to account for the time dependence of the edge current throughout a sawtooth cycle. As edge resistivity is increased in T1 the fluctuation amplitude increases to maintain the dynamo-driven current, as ... continued below

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10 p.

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Prager, S.C.; Almagri, A.F. & Cekic, M. July 1, 1995.

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Description

Two important effects of MHD fluctuations in the RFP and tokamak are current generation (the dynamo effect) and mode locking. In the T1 and MST RFP experiments new results reveal the mode dynamics underlying these phenomena. In T1 the effect of specific magnetic Fourier modes on the current density profile is evident. In MST, the MHD dynamo term ({delta}v x {delta}B) is measured in the plasma edge, and found to account for the time dependence of the edge current throughout a sawtooth cycle. As edge resistivity is increased in T1 the fluctuation amplitude increases to maintain the dynamo-driven current, as expected from MHD computation. The modes responsible for the dynamo often lock to the local magnetic field error at the vertical cut in MST. The plasma rotation velocity has been measured with a fast Doppler spectrometer to a time resolution of 1 {mu}s. The plasma rotation and mode phase velocity are remarkably well-correlated, with both slowing, in the presence of an impulsive field error, in a 100 {mu}s timescale.

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10 p.

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INIS; OSTI as DE95017652

Medium: P; Size: 10 p.

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  • 22. European conference on controlled fusion and plasma physics, Bournemouth (United Kingdom), 2-7 Jul 1995

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  • Other: DE95017652
  • Report No.: DOE/ER/53198--265
  • Report No.: CONF-950704--10
  • Grant Number: FG02-85ER53198
  • Office of Scientific & Technical Information Report Number: 102375
  • Archival Resource Key: ark:/67531/metadc621362

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

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 7:13 p.m.

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Prager, S.C.; Almagri, A.F. & Cekic, M. Plasma rotation, dynamo, and nonlinear coupling in the reversed field pinch, article, July 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc621362/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.