TITLE

Transport by intermittent convection in the boundary of the DIII-D tokamak

AUTHOR(S)
Boedo, J. A.; Rudakov, D.; Moyer, R.; Krasheninnikov, S.; Whyte, D.; McKee, G.; Tynan, G.; Schaffer, M.; Stangeby, P.; West, P.; Allen, S.; Evans, T.; Fonck, R.; Hollmann, E.; Leonard, A.; Mahdavi, A.; Porter, G.; Tillack, M.; Antar, G.
PUB. DATE
November 2001
SOURCE
Physics of Plasmas;Nov2001, Vol. 8 Issue 11, p4826
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Intermittent plasma objects (IPOs) featuring higher pressure than the surrounding plasma, and responsible for ∼50% of the E×B[sub T] radial transport, are observed in the scrape off layer (SOL) and edge of the DIII-D tokamak [J. Watkins et al., Rev. Sci. Instrum. 63, 4728 (1992)]. Conditional averaging reveals that the IPOs, produced at a rate of ∼3×10[sup 3] s[sup -1], are positively charged and also polarized, featuring poloidal electric fields of up to 4000 V/m. The IPOs move poloidally at speeds of up to 5000 m/s and radially with E×B[sub T]/B[sup 2] velocities of ∼2600 m/s near the last closed flux surface (LCFS), and ∼330 m/s near the wall. The IPOs slow down as they shrink in radial size from 4 cm at the LCFS to 0.5 cm near the wall. The IPOs appear in the SOL of both L and H mode discharges and are responsible for nearly 50% of the SOL radial E×B transport at all radii; however, they are highly reduced in absolute amplitude in H-mode conditions. © 2001 American Institute of Physics.
ACCESSION #
5383139

 

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