On the Radial Structure of Fluctuations and Turbulence Induced Flows

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Comparative studies of the structure of turbulence have been carried out in stellarator plasmas with low (TJ-IU) and medium (L2-M) magnetic shear. In both devices, the value of the radial coherence of fluctuations is bursty. In the plasma edge region, the radial coherence is dominated by low frequency fluctuations ({lt}200 KHZ) in TJ-IU, whereas in L2-M, the radial coherence is due to high frequency fluctuations ({gt} 100 kHz). Numerical calculations of resistive ballooning turbulence show that in the non-linear phase, the correlation length is of the order of the width of the linear mode poloidal components, whereas in the linear ... continued below

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11 p.

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Hidalgo, C.; Pedrosa, M. A.; Milligen, B. V /; Sanchez, R. B.; Garcia-Cortes, I.; Batanov, G. et al. January 1, 1997.

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Description

Comparative studies of the structure of turbulence have been carried out in stellarator plasmas with low (TJ-IU) and medium (L2-M) magnetic shear. In both devices, the value of the radial coherence of fluctuations is bursty. In the plasma edge region, the radial coherence is dominated by low frequency fluctuations ({lt}200 KHZ) in TJ-IU, whereas in L2-M, the radial coherence is due to high frequency fluctuations ({gt} 100 kHz). Numerical calculations of resistive ballooning turbulence show that in the non-linear phase, the correlation length is of the order of the width of the linear mode poloidal components, whereas in the linear phase, the correlation length is related to the width of the envelope. Toroidal coupling effects appear to be relevant in the nonlinear phase in the proximity of instability thresholds. The electrostatic Reynolds stress shows a radial gradient close to the velocity shear location in the TJ-IU torsatron, thus suggesting that this mechanism can drive poloidal flows.

Physical Description

11 p.

Notes

OSTI as DE98000679

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  • Other Information: DN: Prepared in collaboration with General Physics Inst., Moscow, Russia,Carlos III Univ., Madrid, Spain, and Euratom-Ciemat, Madrid, Spain. [540 709900]

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  • Other: DE98000679
  • Report No.: ORNL/CP--94616
  • Report No.: CONF-970911--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 618163
  • Archival Resource Key: ark:/67531/metadc691944

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  • January 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 19, 2016, 8:48 p.m.

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Hidalgo, C.; Pedrosa, M. A.; Milligen, B. V /; Sanchez, R. B.; Garcia-Cortes, I.; Batanov, G. et al. On the Radial Structure of Fluctuations and Turbulence Induced Flows, report, January 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc691944/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.