Structure and properties of the electrostatic fluctuations in the far scrape-off layer region of Alcator C-Mod

Citation
Ba. Carreras et al., Structure and properties of the electrostatic fluctuations in the far scrape-off layer region of Alcator C-Mod, PHYS PLASMA, 8(8), 2001, pp. 3702-3707
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
8
Year of publication
2001
Pages
3702 - 3707
Database
ISI
SICI code
1070-664X(200108)8:8<3702:SAPOTE>2.0.ZU;2-X
Abstract
The temporal statistics of density and potential fluctuations measured in b oth the main chamber and divertor far scrape-off layer (SOL) regions (>5 mm outside the magnetic separatrix) of the Alcator C-Mod tokamak [I. M. Hutch inson , Phys. Plasmas 1, 1511 (1994)] are found to change markedly with pla sma density. As the plasma density is increased, the fluctuations become co rrelated over long and short time scales and exhibit a higher level of pers istence and intermittency. Correspondingly, fluctuation-induced cross-field particle fluxes are found to increase by a factor of similar to5 when the plasma density is doubled. These observations are consistent with results f rom SOL particle balance, which indicate an increased level of cross-field transport as the density is raised. These observations also support the ide a that SOL transport dynamics behave as a self-organized system, particular ly at high plasma densities. (C) 2001 American Institute of Physics.