【摘要】 采用HL-2A托卡马克边界的双台阶静电探针，研究了氢、氘等离子体中的阵发性结构统计特性及其对流输运。实验结果表明，氘等离子体中阵发性结构(blob)在近刮削层(near-SOL)区域引起的粒子和热通量相对于氢等离子体中显著增强，这主要由于氘等离子体中阵发性结构具有更高的幅度和更快的径向速度。然而，在远刮削层(far-SOL)区域，氢和氘等离子体中阵发性结构携带的粒子和热通量接近。深入分析表明，阵发性结构速度的变化是影响径向粒子输运和热输运的关键因素，而速度的变化与其内部电势结构相关。实验结果表明，同位素效应在近刮削层阵发性结构的动力学中扮演了重要角色，而对远刮削层中对流输运的影响较小。该研究深化了对刮削层阵发性结构的理解，并且为控制刮削层宽度、未来实现聚变装置稳定安全运行提供一定的物理基础。更多还原

【Abstract】 The blob statistical characteristics and the associated transport have been studied in hydrogen and deuterium dominated plasmas by using a double-step Langmuir probe in the HL-2A tokamak. Experimental results illustrate that the blob induced particle and heat fluxes at near Scrape-Off Layer(SOL) region are substantially enhanced when the discharge is transferred from hydrogen to deuterium dominated plasmas, which are mainly attributed to the large amplitude and fast radial motion of blobs. However, the blob-carried particle and heat fluxes at far-SOL region remain the nearly identical in both two hydrogen isotope plasmas. The analysis indicates that the variation in blob velocity is a crucial factor influencing radial particle and heat transports, which is correlated with changes in its internal potential structure. The experimental results given here clearly demonstrate that isotope mass has a significant role on near SOL transport rather than on far-SOL one. This study could improve our understanding of SOL turbulence physics governed by isotope effect, which provides a physical basis for the control of SOL width by changing the isotope mass, aiming for the achievement of stable plasma operation in future fusion devices.更多还原