Investigation of mechanisms of hydrogen retention in tungsten coating layers simultaneously irradiated by hydrogen and carbon ions

研究了氢在钨包覆层中的保留机理，采用混合氘和碳离子束辐照，其中碳离子含量高达3.2%。当辐照温度为500 K时，注入的氘原子滞留在本征缺陷处，碳原子在钨涂层中积累。当辐照温度为700 K时，注入的氘原子被保留在钨涂层中积聚的碳原子处，氘原子与碳原子发生化学键合，形成C-D键。通过加热钨涂层，积累的大部分氘原子以碳氢化合物分子的形式解吸。这导致除去钨涂层中积累的碳原子以及保留的氘原子。

Mechanisms of hydrogen retention in tungsten coating layers have been investigated with a mixed deuterium and carbon ion beam irradiation including a carbon ion fraction of up to 3.2%. For the irradiation temperature of 500 K, injected deuterium atoms are retained at intrinsic defects and carbon atoms accumulated in the tungsten coating layer. For the irradiation temperature of 700 K, injected deuterium atoms are retained at carbon atoms accumulated in the tungsten coating layer, and the deuterium atoms are chemically bonded with the carbon atoms, forming C-D bonds. Most of the accumulated deuterium atoms desorb in the form of hydrocarbon molecules by heating of the tungsten coating layer. This leads to removal of the accumulated carbon atoms from the tungsten coating layer in addition to the retained deuterium atoms.