Quiescent high-confinement mode plasmas with edge-harmonic oscillations do not exhibit the explosive instabilities associated with edge-localized modes. Instead, an additional means of enhanced transport is considered to maintain the plasma edge under conditions just below the boundary of the peeling mode instability. Although the potential of the peeling mode has been widely recognized in plasma physics, no direct evidence for this mode has been revealed previously because decisive diagnostics were lacking. Herein, we report evidence of the structure and dynamical steady state of peeling mode in quiescent high-confinement mode. Edge-harmonic oscillations are dominated by fundamental mode at both the low- and high-field sides. Edge perturbations are confirmed to have kink parity and exhibit the frozen-in-condition predicted by linear stability analysis. The envelope signal of the fundamental mode exhibits repeated cycles of growth and damping in association with minor changes in the edge gradient. Results from this study are quantitatively consistent with limit-cycle-oscillation model.

具有边缘谐波振荡的静态高约束模式等离子体不会表现出与边缘局部模式相关的爆炸不稳定性。取而代之的是，一种额外的增强传输方式被认为是在刚好低于剥离模式不稳定性边界的条件下保持等离子体边缘。尽管剥离模式的潜力已在等离子体物理学中得到广泛认可，但之前并未揭示这种模式的直接证据，因为缺乏决定性的诊断方法。在此，我们报告了静态高限制模式下剥离模式的结构和动态稳态的证据。边缘谐波振荡在低场侧和高场侧均以基模为主。边缘扰动被证实具有扭结奇偶性，并表现出线性稳定性分析预测的冻结状态。基本模式的包络信号表现出与边缘梯度的微小变化相关的重复增长和衰减循环。这项研究的结果在数量上与极限循环振荡模型一致。