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Suppression of electron temperature gradient turbulence via negative magnetic shear in NSTX

Publication ,  Journal Article
Yuh, HY; Kaye, SM; Levinton, FM; Mazzucato, E; Mikkelsen, DR; Smith, DR; Bell, RE; Hosea, JC; Leblanc, BP; Peterson, JL; Park, HK; Lee, W
Published in: Physical Review Letters
February 3, 2011

Negative magnetic shear is found to suppress electron turbulence and improve electron thermal transport for plasmas in the National Spherical Torus Experiment (NSTX). Sufficiently negative magnetic shear results in a transition out of a stiff profile regime. Density fluctuation measurements from high-k microwave scattering are verified to be the electron temperature gradient (ETG) mode by matching measured rest frequency and linear growth rate to gyrokinetic calculations. Fluctuation suppression under negligible E×B shear conditions confirm that negative magnetic shear alone is sufficient for ETG suppression. Measured electron temperature gradients can significantly exceed ETG critical gradients with ETG mode activity reduced to intermittent bursts, while electron thermal diffusivity improves to below 0.1 electron gyro-Bohms. © 2011 American Physical Society.

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Published In

Physical Review Letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

February 3, 2011

Volume

106

Issue

5

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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MLA
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Yuh, H. Y., Kaye, S. M., Levinton, F. M., Mazzucato, E., Mikkelsen, D. R., Smith, D. R., … Lee, W. (2011). Suppression of electron temperature gradient turbulence via negative magnetic shear in NSTX. Physical Review Letters, 106(5). https://doi.org/10.1103/PhysRevLett.106.055003
Yuh, H. Y., S. M. Kaye, F. M. Levinton, E. Mazzucato, D. R. Mikkelsen, D. R. Smith, R. E. Bell, et al. “Suppression of electron temperature gradient turbulence via negative magnetic shear in NSTX.” Physical Review Letters 106, no. 5 (February 3, 2011). https://doi.org/10.1103/PhysRevLett.106.055003.
Yuh HY, Kaye SM, Levinton FM, Mazzucato E, Mikkelsen DR, Smith DR, et al. Suppression of electron temperature gradient turbulence via negative magnetic shear in NSTX. Physical Review Letters. 2011 Feb 3;106(5).
Yuh, H. Y., et al. “Suppression of electron temperature gradient turbulence via negative magnetic shear in NSTX.” Physical Review Letters, vol. 106, no. 5, Feb. 2011. Scopus, doi:10.1103/PhysRevLett.106.055003.
Yuh HY, Kaye SM, Levinton FM, Mazzucato E, Mikkelsen DR, Smith DR, Bell RE, Hosea JC, Leblanc BP, Peterson JL, Park HK, Lee W. Suppression of electron temperature gradient turbulence via negative magnetic shear in NSTX. Physical Review Letters. 2011 Feb 3;106(5).

Published In

Physical Review Letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

February 3, 2011

Volume

106

Issue

5

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences