Understanding the self-organized behaviour of particle confinement is critical for density control in magnetically confined thermonuclear fusion devices. This paper investigates the spontaneous evolution of density peaking factor in TEM turbulence-dominated ( \({{\varvec{k}}}_{{\varvec{\theta}}}{{\varvec{\rho}}}_{{\varvec{s}}}\sim 1.5-2.1\) ) H-mode plasma discharge, and the relationship between broadband turbulence ( \({\varvec{f}}\sim 500-2000\) kHz) and particle confinement is experimentally reported for the first time. In the plasma core region ( \({\varvec{\uprho}}\approx 0-0.4\) ) with higher pressure gradient and lower collisionality ( \({{\varvec{v}}}_{{\varvec{e}}{\varvec{f}}{\varvec{f}}}<5\) ), TEM turbulence is suppressed by the \({\varvec{E}}\times {\varvec{B}}\) flow, which causes the increase in density peaking factor and the pressure gradient, while the strengthening of the pressure gradient further enhances the \({\varvec{E}}\times {\varvec{B}}\) flow. This positive feedback mechanism finally leads to a scenario where particle confinement continuously improves. Additionally, the positive feedback mechanism can induce the ne-ITBs with higher auxiliary heating power. In the plasma outer region ( \({\varvec{\uprho}}\approx 0.4-0.8\) ) with lower pressure gradient, the pressure gradient does not dominate the evolution of poloidal \({\varvec{E}}\times {\varvec{B}}\) flow, and the positive feedback mechanism does not work. The positive correlation connection between the \({\varvec{E}}\times {\varvec{B}}\) rotation velocity and TEM turbulence intensity radial gradient suggests that the Reynolds stress may contribute to the increase in poloidal \({\varvec{E}}\times {\varvec{B}}\) flow. These findings can help us understand the self-organized behaviours for particle confinement and expand the methods for controlling plasma density.
