Dependence of pedestal properties on plasma parameters

作者：Kim S. K.; Na Y. -S.; Saarelma S.; Kwon O.^*

来源：Nuclear Fusion, 2018, 58(1): 016036.

DOI：10.1088/1741-4326/aa96bb

• edge pedestal
• pedestal stability
• plasma shape
• edge collisionality
• EPED
• poloidal beta
• ideal MHD

We have numerically investigated the dependence of pedestal properties such as the pedestal height and the pedestal width on various global parameters using the EURO-DEMO as the reference equilibrium. We have used EPED, a predictive model of the edge pedestal. Among global parameters, we have chosen to vary the triangularity, delta, the elongation, kappa, and the poloidal beta, beta(p), which have larger effects on the pedestal properties. Improvement of pedestal properties can be achieved for more shaped plasma boundary. However, the increase in the pedestal height and the width with delta saturates around delta similar to 0.6. Also, the pedestal width saturates and the pedestal temperature starts to decrease for kappa > 1.9. Improvement of the pedestal properties due to delta is larger at higher poloidal beta. The pedestal width slightly increases with the electron density at the pedestal top and the effective charge number.

• 出版日期2018-1