X Ray Observations Of Up Down Impurity Density Asymmetries In Alcator C Mod Plasmas
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Impurity Transport in Alcator C-Mod Plasmas
Author | : John E. Rice |
Publisher | : |
Total Pages | : 86 |
Release | : 2005 |
Genre | : |
ISBN | : |
(cont.) These edge values of the transport coefficients during EDA H-mode are qualitatively similar to the neoclassical values. In ELM-free H-mode discharges, impurity accumulation occurs, dominated by large inward impurity convection in the pedestal region. A scaling of the impurity confinement time with H-factor reveals a very strong exponential dependence. In ITB discharges, there is significant impurity accumulation inside of the barrier foot, typically at r/a = 0.5. Steady state impurity density profiles in L-mode plasmas have a large up-down asymmetry near the last closed flux surface. The impurity density enhancement, in the direction opposite to the ion BxB drift, is consistent with modeling of neo-classical parallel impurity transport.