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This paper presents the results of an extensive experimental investigation carried out in the Frascati Tokamak Upgrade (FTU) on the particle confinement properties for gas fuelled discharges in the density range from 3.0 x 1.0 E19 to 2.5 x 1.0 E20/m3. It is found that the rate of rise of the number of electrons in the discharge agrees well with the electron deposition rate due to gas fuelling, once the scrape-off layer (SOL) transparency is taken into account. When the experimental radial velocity, measured by perturbing the density profiles, is modelled by a convective velocity, U, and a diffusion coefficient, D, it is found that this model is not always able to describe the experiments and, when it occurs, U is nearly linear with the minor radius while D is almost flat and sensibly lower than the experimental electron thermal diffusivity.

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Authors: ALLADIO F ET AL., ENEA, Centro Ricerche Energia Frascati, Roma (IT);GRANUCCI G, Istituto di Fisica del Plasma, CNR, Milano (IT);SEGRE S E, II Università degli Studi di Roma "Tor Vergata" (IT);ZAGORSKI R, Institute of Plasma Physics and Laser Microfusion, Warsaw (PL)
Bibliographic Reference: Paper presented: 15th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Seville (ES), September 26 - October 1, 1994
Availability: Available from (1) as Paper EN 38625 ORA
Record Number: 199411309 / Last updated on: 1994-12-06
Original language: en
Available languages: en