Impurity-induced turbulence suppression and reduced transport in the DIII-D tokamak*
نویسندگان
چکیده
Impurity-induced turbulence suppression and reduced transport in the DIII-D tokamak* G. R. McKee, M. Murakami, J. A. Boedo, N. H. Brooks, K. H. Burrell, D. R. Ernst, R. J. Fonck, G. L. Jackson, M. Jakubowski, R. J. La Haye, A. M. Messiaen, J. Ongena, C. L. Rettig, B. W. Rice, C. Rost, G. M. Staebler, R. D. Sydora, D. M. Thomas, B. Unterberg, M. R. Wade, and W. P. West General Atomics, P.O. Box 85608, San Diego, California 92186-5608
منابع مشابه
Turbulent transport of impurities and their effect on energy confinement
By presenting linear and nonlinear gyrokinetic studies, based on a balanced neutral beam injection deuterium discharge from the DIII-D tokamak, we demonstrate that impurities alter the scaling of the transport on the charge and mass of the main species, and even more importantly, they can dramatically change the energy transport even in relatively small quantities. A poloidally varying equilibr...
متن کاملEX/P5-35 Observation of Reduced Core Electron Temperature Fluctuations and Intermediate Wavenumber Density Fluctuations in H- and QH-mode Plasmas
In this paper, we report observations of reduced low-k core electron temperature and intermediate-k density fluctuations in H-mode and quiescent (QH)-mode. L-mode electron temperature fluctuation levels (0.5% ̃ T e /Te 2% for k s 0.5 as measured by correlation ECE (CECE) radiometry) are observed to decrease by at least a factor of four in H and QH-mode regimes in the DIII-D tokamak (r/a = 0.7)....
متن کاملEnhanced con®nement discharges in DIII-D with neon and argon induced radiation
Enhanced energy con®nement in discharges with impurity induced radiating power fractions, Prad/Pin, from 50% to 100% have been observed in the DIII-D tokamak with neon and argon gas pung. These radiating mantle enhanced con®nement discharges have been obtained in the DIII-D tokamak under a variety of conditions: diverted and limited con®gurations with both an H-mode and L-mode edge. Con®nement...
متن کاملSignature of turbulent zonal flows observed in the DIII-D tokamak.
The spectrum of turbulent density fluctuations at long poloidal wavelengths in the edge plasma of the DIII-D tokamak peaks at nonzero radial wave number. The associated electric-potential fluctuations cause sheared E x B flows primarily in the poloidal direction. These zonal flows have been predicted by theory and are believed to regulate the overall level of turbulence and anomalous transport....
متن کاملDecorrelation of Edge Plasma Turbulence at the Transition from Low- to High-Con nement Mode in the DIII{D Tokamak
The modi cation of turbulence in the edge plasma of the DIII{D tokamak at the transition from the low to the high mode of con nement is investigated with a phase-contrast imaging diagnostic. The amplitude and radial correlation length of the turbulence in the con nement region decrease at the transition, whereas the decorrelation time increases. The transition model of Biglari, Diamond, and Ter...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000