Study of micro-instabilities in toroidal plasmas with negative magnetic shear

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The micro-instabilities driven by a parallel velocity shear, and a temperature gradient of ions are studied in toroidal plasmas with negative magnetic shear. Both the fluid and the gyro-kinetic formulations are investigated. It is found that for a broad range of parameters, the linear growth rates of the modes are lower, and the threshold temperature gradient {eta}{sub icr} is higher for plasmas with negative magnetic shear compared to plasmas with positive magnetic shear of equal magnitude. The reduction in the growth rate (with negative shear), although not insignificant, does not seem to be enough to account for the dramatic improvement ... continued below

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29 p.

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Dong, J.Q.; Zhang, Y.Z.; Mahajan, S.M. & Guzdar, P.N. March 1, 1996.

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Description

The micro-instabilities driven by a parallel velocity shear, and a temperature gradient of ions are studied in toroidal plasmas with negative magnetic shear. Both the fluid and the gyro-kinetic formulations are investigated. It is found that for a broad range of parameters, the linear growth rates of the modes are lower, and the threshold temperature gradient {eta}{sub icr} is higher for plasmas with negative magnetic shear compared to plasmas with positive magnetic shear of equal magnitude. The reduction in the growth rate (with negative shear), although not insignificant, does not seem to be enough to account for the dramatic improvement in the confinement observed experimentally. Other possible physical mechanisms for the improved confinement are discussed.

Physical Description

29 p.

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INIS; OSTI as DE96010195

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  • Other Information: PBD: Mar 1996

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  • Other: DE96010195
  • Report No.: DOE/ER/54346--743
  • Report No.: IFSR--743
  • Grant Number: FG03-96ER54346
  • DOI: 10.2172/226404 | External Link
  • Office of Scientific & Technical Information Report Number: 226404
  • Archival Resource Key: ark:/67531/metadc669439

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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.

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  • March 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Aug. 10, 2016, 2:15 p.m.

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Dong, J.Q.; Zhang, Y.Z.; Mahajan, S.M. & Guzdar, P.N. Study of micro-instabilities in toroidal plasmas with negative magnetic shear, report, March 1, 1996; Austin, Texas. (digital.library.unt.edu/ark:/67531/metadc669439/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.