Observations of Reduced Electron Gyro-scale Fluctuations in National Spherical Torus Experiment H-mode Plasmas with Large E × B Flow Shear

Smith, D. R. ; Kaye, S. M. ; Lee, W. ; Mazzucato, E. ; Park, H. K. ; Bell, R. E. ; Domier, C. W. ; LeBlanc, B. P. ; Levinton, F. M. ; Luhmann, Jr., N. C. ; Menard, J. E. ; Yu, H.

Princeton University. Plasma Physics Laboratory.

关键词: Beam Injection;    Amplitudes;    Nstx;    70 Plasma Physics And Fusion Technology;    Turbulence Nstx;   

RP-ID  :  PPPL-4380
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  950696

美国|英语

来源: UNT Digital Library

【 摘 要 】

Electron gyro-scale fluctuation measurements in National Spherical Torus Experiment (NSTX) H-mode plasmas with large toroidal rotation reveal fluctuations consistent with electron temper- ature gradient (ETG) turbulence. Large toroidal rotation in NSTX plasmas with neutral beam injection generates E × B flow shear rates comparable to ETG linear growth rates. Enhanced fluctuations occur when the electron temperature gradient is marginally stable with respect to the ETG linear critical gradient. Fluctuation amplitudes decrease when the E × B flow shear rate exceeds ETG linear growth rates. The observations indicate E × B flow shear can be an effective suppression mechanism for ETG turbulence.