The effect of isotope mass on the interaction between turbulence and geodesic acoustic mode (GAM) zonal flows has been investigated in HL-2A ohmically heated deuterium (D) and hydrogen (H) plasmas using a double-step Langmuir probe array. The experimental results indicate that the level of GAM zonal flows and the turbulence eddy size together with the eddy tilting angle are all increased in the edge region in D plasmas compared to those in H plasmas under similar discharge parameters involving plasma current, magnetic field and line-averaged density. Evidence shows that in D plasmas, the nonlinear energy transfer is the main cause of the stronger excitation of GAM zonal flows, which extract more energy from ambient turbulence and, consequently, lead to lower turbulent transport and better confinement in D plasmas. The experimental findings may contribute to the understanding of the isotopic physics and associated turbulent transport in tokamak plasmas.
同位素质量对湍流与测地声模（GAM）带状流之间相互作用的影响已在HL-2A欧姆加热的氘（D）和氢（H）等离子体中通过双探针阵列进行了研究。实验结果表明，在相似的等离子体参数（包括等离子体电流、磁场和线平均密度）下，与H等离子体相比，D等离子体边缘区域的GAM带状流水平、湍流涡旋尺寸以及涡旋倾斜角均有所增加。证据表明，在D等离子体中，非线性能量转移是GAM带状流更强激发的主要原因，该过程从背景湍流中提取更多能量，从而在D等离子体中导致更低的湍流输运和更好的约束。这些实验发现可能有助于理解托卡马克等离子体中的同位素物理及相关湍流输运。