Experimental evidence of edge turbulence driven by multiple mechanisms in ATF
C. Hidalgo; J.H. Harris; T. Uckan; G.R. Hanson; J.D. Bell; M.A. Meier; C.P. Ritz; A.J. Wootton; C. Hidalgo; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; J.H. Harris; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; T. Uckan; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; G.R. Hanson; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; J.D. Bell; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; M.A. Meier; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; C.P. Ritz; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain; A.J. Wootton; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, Spain
Журнал:
Nuclear Fusion
Дата:
1993-01-01
Аннотация:
The scaling properties of edge fluctuations have been investigated using Langmuir probes in the edge region of the Advanced Toroidal Facility (ATF). The fluctuations in the ion saturation current (Ĩ<sub>s</sub>/I<sub>s</sub>) and the transport inferred from the fluctuations increase with increasing density gradient, while the local electron temperature is kept unchanged. The modification of the electron temperature in the range 10-50 eV while keeping the density profile constant does not have any significant influence on Ĩ<sub>s</sub>/I<sub>s</sub>. In regions where E<sub>r</sub>/B ≈ 0, the poloidal phase velocity of the fluctuations is given by v<sub>ph</sub> ≈ 2T<sub>e</sub>/L<sub>n</sub>B. More than one of the proposed mechanisms must be invoked to explain all the experimental observations
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