Upstream separatrix temperature dependence in EDGE2D-EIRENE for JET H-mode plasmas

Upstream separatrix temperature dependence in EDGE2D-EIRENE for JET H-mode plasmas

Upstream separatrix temperature dependence in EDGE2D-EIRENE for JET H-mode plasmas 150 150 amit lakhani
UKAEA-CCFE-CP(20)96

Upstream separatrix temperature dependence in EDGE2D-EIRENE for JET H-mode plasmas

EDGE2D-EIRENE simulations of upstream density and radiative power scans in JET H-mode type plasmas in vertical target predict a linear relationship between the electron and ion temperatures, and power across the separatrix. This is in contradiction to the two-point model equations which states that the upstream temperature scales at the power crossing the separatrix to the power 2/7 – equation (4.87) in reference [1]. The upstream separatrix temperature – here defined as the low-field side mid-plane – is a critical boundary condition for pedestal stability analysis [2]. Using the two-point model 2/7 scaling as a physics basis, the JET separatrix temperature is routinely predicted at 100 eV. Semi-analytic models for the power decay width prediction also rely on the same two-point temperature equation [3]. Therefore, understanding the validity of temperature equation under varying plasma conditions is paramount and the focus of this work.

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23rd International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI), Princeton, NJ, USA, 17-22 June 2018