Edge rotation from momentum transport by neutrals

Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas 2016

Omotani, J.T.^1 ; Newton, S.L.^1,2 ; Pusztai, I.^1 ; Fülöp, T.^1

Department of Physics, Chalmers University of Technology, Gothenburg

41296, Sweden^1

CCFE, Culham Science Centre, Abingdon, Oxon

OX14 3DB, United Kingdom^2

关键词: Carbon impurities;    Charge-exchange recombination spectroscopies;    Inverse aspect ratio;    Ion distributions;    Momentum transports;    Numerical solvers;    Plasma rotations;    Radial electric field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/775/1/012011/pdf
DOI  :  10.1088/1742-6596/775/1/012011

来源: IOP

【 摘 要 】

Due to their high cross field mobility, neutral atoms can have a strong effect on transport even at the low relative densities found inside the separatrix. We use a charge-exchange dominated model for the neutrals, coupled to neoclassical ions, to calculate momentum transport when it is dominated by the neutrals. We can then calculate self-consistently the radial electric field and predict the intrinsic rotation in an otherwise torque-free plasma. Using a numerical solver for the ion distribution to allow arbitrary collisionality, we investigate the effects of inverse aspect ratio and elongation on plasma rotation. We also calculate the rotation of a trace carbon impurity, to facilitate future comparison to experiments using charge exchange recombination spectroscopy diagnostics.