Publications in Scientific Journals:
L. Shao, E. Wolfrum, F. Ryter, G. Birkenmeier, F. Laggner, E. Viezzer, R. Fischer, M. Willensdorfer, B. Kurzan, T. Lunt, . ASDEX Upgrade Team:
"On the role of the edge density profile for the L-H transition power threshold in ASDEX Upgrade";
Plasma Physics and Controlled Fusion,
58
(2016),
2;
02550401
- 02550411.
English abstract:
The L-H transition power threshold (PL−H) in full tungsten (W) wall discharges is lower by
25% compared to those with graphite (C) mix tungsten walls in ASDEX Upgrade (Ryter et al
2013 Nucl. Fusion 53 113003). The lower power threshold in the full tungsten wall discharges
has been found to correlate with higher edge density as well as steeper edge density gradient.
An estimate of the minimum in the neoclassical radial electric field well inside the separatrix
yields a constant value for all analyzed L-H transitions at fixed toroidal magnetic field (BT).
The decrease of the threshold power is explained by the steeper edge density gradient in the
discharges with full tungsten wall.
Keywords:
L-H transition, power threshold, edge density profile
Created from the Publication Database of the Vienna University of Technology.