Abstract

In the framework of the isotope effect studies at the FT-2 tokamak, the efficiencies were compared of the lower hybrid wave heating of the ion components of the hydrogen and deuterium plasmas with high densities (close to the Greenwald limit, 〈n_e〉 ≤ 10²⁰ m^–3). It was experimentally ascertained that, in accordance with the theoretical concepts, the efficient axial heating of the deuterium plasma ions occurs, as opposed to the peripheral heating of the hydrogen plasma ions. Such an isotope effect occurs due to the different localization of the plasma-RF wave interaction regions. The distinctive feature of these experiments is the fact that, in deuterium plasma, during the preliminary ohmic heating, the dependence of the energy lifetime on density τ_Е(n) is linear (LOC dependence), and, with increasing density, the transition to the improved ohmic confinement mode occurs. In hydrogen plasma, on the contrary, the transition to the saturation mode is observed. In this study, the considerable decrease in τ_Е was revealed, observed during the additional lower hybrid wave heating in both hydrogen and deuterium plasmas.

中文翻译：

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FT-2托卡马克低密度氢离子和氘等离子体中离子的低杂波加热比较实验

摘要

在在FT-2托卡马克的同位素效应研究的框架下，效率比较高密度（接近格林沃尔德极限，<氢和氘等离子体的离子成分的低杂波加热的Ñ _Ë >≤ 10 ²⁰ m ^–3）。通过实验确定，根据理论概念，发生了氘等离子体离子的有效轴向加热，这与氢等离子体离子的周边加热相反。由于等离子体-RF波相互作用区域的不同定位而发生这种同位素效应。这些实验的独特之处在于，在氘等离子体中，在初步的欧姆加热过程中，能量寿命与密度τ的相关性_Е（n）是线性的（取决于LOC），并且随着密度的增加，会发生向改进的欧姆约束模式的过渡。相反，在氢等离子体中，观察到向饱和模式的转变。在这项研究中，发现在氢和氘等离子体中，杂化波加热进一步降低时，可观察到_τÅ的显着降低。