The impact of isotope mass on the radial correlation length () and long-range correlation (LRC) of plasma turbulence has been investigated in electron cyclotron resonance heated (ECRH) low-density deuterium-hydrogen plasmas in the TJ-II stellarator. We find that the increases with the deuterium/hydrogen (D/H) ratio. However, the amplitude of LRC decreases slightly with the D/H ratio, in contrast to previous results in tokamak plasmas Xu et al (2013 Phys. Rev. Lett. 110 265005). These findings show the impact of the isotope effect on both the largest scales (LRC determined by the size of the device) and the characteristic radial scale of turbulent structures.
摘要：在TJ-II仿星器中，电子回旋共振加热（ECRH）的低密度氘-氢等离子体中，研究了同位素质量对等离子体湍流径向相关长度（）和长程相关（LRC）的影响。我们发现，随着氘/氢（D/H）比值的增加，增大。然而，LRC的幅度随D/H比值的增加而略有下降，这与之前在托卡马克等离子体中的结果形成对比（Xu等人，2013年，《物理评论快报》110, 265005）。这些发现表明，同位素效应对最大尺度（由装置尺寸决定的LRC）以及湍流结构的特征径向尺度均有影响。