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.