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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:Neoclassical Impurity Transport in Stellarator Geometry
DTSTART:20121003T150000
DTEND:20121003T160000
DTSTAMP:20260510T135131Z
UID:16da39310e0b6fd24b326ee4a24f8aecffeb2a9e05bfb58c06aef540
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. J.M. Garcìa-Regaña\, Max-Planck-Institute für Plasmaph
 ysik\, Greifswald\, Germany\nThe impurity dynamics in stellarators has bec
 ome an issue of moderate concern due to the\, a priori\, inherent tendenc
 y of the impurities to accumulate in the core when the neoclassical ambip
 olar radial electric field points inwards (ion root regime). This accumul
 ation can lead to collapse of the plasma due to radiative losses\, and thu
 s limit high performance plasma discharges in non-axisymmetric devices.\n
 Theoretically\, a quantitative description of the neoclassical impurity tr
 ansport is complicated by the breakdown of the assumption of small qΦ/T 
 for impurities\, where q is the electric charge\, T the temperature in en
 ergy units\, and Φ the electrostatic potential variation within the flu
 x surface.\nThe present work describes quantitatively the particle transpo
 rt of impurities in the frame of local neoclassical theory when qΦ/T = O
 (1) in the Large Helical Device (LHD) stellarator. The central numerical 
 tool used to describe the impurity dynamics is the δf particle in cell (
 PIC) Monte Carlo code EUTERPE. The Φ considered in the calculations is p
 rovided by the neoclassical code GSRAKE  and by EUTERPE self-consistentl
 y. The results indicate a strong mitigation of the impurity inward flux p
 redicted by the standard mono-energetic neoclassical theory.
LOCATION:PPB 019
STATUS:CONFIRMED
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