2024 – Disentangle the effects of neutral and turbulence transport on pedestal structure in high opaque edge

Disentangle the effects of neutral and turbulence transport on pedestal structure in high opaque edge

2024 Research Campaign, Pedestal and Non/Small ELM Regimes

Purpose of Experiment

The goal of this proposal is to disentangle the effects of neutral and turbulence transport on pedestal structure at reactor-scale high opaque edge.

Experimental Approach

The experiment will leverage the newly developed neutral diagnostics (LLAMA & ALPACA, MiCER) and world-lead pedestal profile and fluctuations measurements. The proposal aims to gain physical mechanisms of pedestal structure from the following aspects: a) quantify the neutral penetration in highly opaque boundary and assess the impact of neutral effects on pedestal shift; b) quantify the turbulence transport at setting pedestal structure for both the low-k and high k turbulence; particular the correlation of pedestal turbulence on pedestal width and height scaling comparing to the theoretical prediction; c) clarify the role of magnetic shear, rho*, eta_e, eta_i on pedestal turbulence and pedestal structure at high opacity boundary.

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