The separatrix electron density in JET, ASDEX upgrade and alcator C-Mod H-mode plasmas: A common evaluation procedure and correlation with engineering parameters

The separatrix electron density in JET, ASDEX upgrade and alcator C-Mod H-mode plasmas: A common evaluation procedure and correlation with engineering parameters

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The separatrix electron density is an important parameter for core-edge scenario integration in tokamak devices, as it influences plasma confinement, divertor detachment and disruption avoidance.This quantity has been measured in H-mode discharges on JET, ASDEX Upgrade and Alcator C-Mod by applying the same fitting function to Thomson scattering measurements, and by employing the same analysis technique based on scrape-off layer power balance.To estimate the power crossing arcade smokey the bear belt the separatrix, the inter-ELM time derivative of the plasma energy dW/dt has been experimentally evaluated and found to be approximately a constant fraction of the absorbed heating power.Correlations between ne,sep and engineering parameters have been investigated, revealing that ne,sep scales with the divertor neutral pressure p0,div in a similar manner across all devices.Additionally, when ne,sep is normalized to the obtained p0,div dependency, no clear correlation with the plasma current is found.

These observations are in agreement with the 2-point model, which iphone 13 price dallas suggests that the upstream separatrix density is mainly set by the recycling at the divertor target.