Abstract

Neutron-irradiated tungsten (W) samples were exposed to helium (He)–seeded deuterium (D) plasmas using a linear plasma device called Tritium Plasma Experiment in order to investigate the synergetic effects of neutron and He irradiations on D retention in W. Exposure to nonseeded D plasma was also performed for neutron-irradiated and nonirradiated W samples for comparison. Deuterium retention in neutron-irradiated W after D plasma exposure was two to three times larger than that in W without neutron irradiation. Nevertheless, He seeding in D plasma resulted in a drastic reduction in D retention. The cross-sectional observation by transmission microscopy showed formation of He bubble layers with a thickness of 10 to 20 nm. There is a possibility that alpha particles in fusion plasma reduce tritium retention in neutron-irradiated plasma-facing components with W layers.

摘要

为了研究中子和He辐照对W中D保留的协同作用，使用称为Tri等离子体实验的线性等离子体装置将中子辐照的钨（W）样品暴露于氦（He）播种的氘（D）等离子体中。还对中子辐照的和未辐照的W样品进行了非种子D等离子体的D等离子体比较，以进行比较。D等离子体暴露后，中子辐照的W中的氘保留量是未中子辐照的W中的氘保留量的2至3倍。然而，He播种在D血浆中导致D保留量急剧减少。通过透射显微镜的横截面观察显示形成了厚度为10至20nm的He气泡层。