Japan Atomic Energy Agency, Naka Fusion Institute, Ibaraki, Japan.
Phys Rev Lett. 2012 Sep 21;109(12):125001. doi: 10.1103/PhysRevLett.109.125001. Epub 2012 Sep 18.
The dependence of the ion-temperature-gradient scale length on the hydrogen isotope mass was examined in conventional H-mode plasmas in JT-60U tokamak. While identical profiles for density and temperature were obtained for hydrogen and deuterium plasmas, the ion conductive heat flux necessary for hydrogen to sustain the same ion temperature profile was two times that required for deuterium, resulting in a clearly higher ion heat diffusivity for hydrogen at the same ion-temperature-gradient scale length. On the other hand, the ion-temperature-gradient scale length for deuterium is less than that for hydrogen at a given ion heat diffusivity.
在 JT-60U 托卡马克的传统 H 模式等离子体中，研究了离子温度梯度尺度长度对氢同位素质量的依赖关系。虽然在氢和氘等离子体中获得了相同的密度和温度分布，但为了维持相同的离子温度分布，氢所需的离子传导热通量是氘的两倍，这导致在相同的离子温度梯度尺度长度下，氢的离子热扩散系数明显更高。另一方面，在给定的离子热扩散系数下，氘的离子温度梯度尺度长度小于氢的离子温度梯度尺度长度。
