Short-Scale Turbulent Fluctuations Driven by the Electron-Temperature Gradient in the National Spherical Torus Experiment

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.101.075001· OSTI ID:1000314

Mazzucato, E. ^[1]; Smith, D. R. ^[1]; Bell, R. E. ^[1]; Kaye, S. ^[1]; Davis, W. ^[1]; Hosea, J. ^[1]; LeBlanc, B ^[1]; Wilson, J. R. ^[1]; Ryan, Philip Michael ^[2]; Domier, C. W. ^[3]; Luhmann, N. C. ^[3]; Yuh, H. ^[4]; Lee, W. ^[5]; Park, H. ^[5]

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1. Princeton Plasma Physics Laboratory (PPPL)
2. ORNL
3. University of California, Davis
4. Nova Photonics
5. Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea

Measurements with coherent scattering of electromagnetic waves in plasmas of the National Spherical Torus Experiment indicate the existence of turbulent fluctuations in the range of wave numbers k?e 0:1 0:4, corresponding to a turbulence scale length nearly equal to the collisionless skin depth. Experimental observations and agreement with numerical results from a linear gyrokinetic stability code support the conjecture that the observed turbulence is driven by the electron-temperature gradient.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1000314
• Journal Information: Physical Review Letters, Vol. 101, Issue 7; ISSN 0031-9007
• Country of Publication: United States
• Language: English