Theory of the scrape-off layer width in inner-wall limited tokamak plasmas

We develop a predictive theory applicable to the scrape-off layer (SOL) of inner-wall limited plasmas. Using the non-linear flattening of the pressure profile as a saturation mechanism for resistive ballooning modes, we are able to demonstrate and quantify the increase of the SOL width with plasma size, connection length, plasma beta, and collisionality. Individual aspects of the theory, such as saturation physics, parallel dynamics, and system size scaling, are tested and verified using non-linear, 3D flux-driven SOL turbulence simulations. Altogether, very good agreement between theory and simulation is found.


Published in:
Nuclear Fusion -Original Edition-, 54, 4, 043003
Year:
2014
Publisher:
International Atomic Energy Agency
ISSN:
0029-5515
Keywords:
Laboratories:
SPC
CRPP




 Record created 2014-03-11, last modified 2018-01-28

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