کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9951875 | 1429317 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Degradation of thermal conductivity of the damaged layer of tungsten irradiated by helium-plasma
ترجمه فارسی عنوان
تضعیف هدایت حرارتی لایه آسیب دیده تنگستن تابش شده توسط هلیوم پلاسما
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کلمات کلیدی
تنگستن، پلاسما هلیوم، هدایت حرارتی، ترموگرافی گذرا،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Pure tungsten samples were irradiated by helium plasma in the linear plasma device PSI-2 with an ion energy of 40âeV and a flux of 1.1âÃâ1022âmâ2sâ1. The irradiation temperature was from 523âK to 773âK and the fluence was from 1.0âÃâ1025 to 1.0âÃâ1026âmâ2. A damaged layer of 10ânm thickness was formed on the sample surface with a destroyed crystalline structure. Helium-bubbles and surface modification in nanoscale were observed. Thermal conductivities of the ultra-thin damaged layers were measured by the transient thermoreflectance technique. Result shows that the thermal conductivity reduced two orders of magnitude compared to the bulk value and decreased with increasing irradiation temperature and fluence. Moreover, the helium-irradiated samples were exposed to ELM-like heat load produced by electron beam on EMS-60. The pulse length was 1âms and each sample was exposed to 5 pulses. Melting occurred under power density of 1.7âGWâmâ2. As the thermal conductivity of the damaged layer decreased, the molten bath of the irradiated sample deepened. The degraded thermal conductivity led to a lower melting threshold. The characterization of the thermal conductivity of the damaged layer induced by the plasma irradiation is a promising way to estimate the damage level, as well as the failure threshold, of the plasma facing components.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fusion Engineering and Design - Volume 137, December 2018, Pages 97-103
Journal: Fusion Engineering and Design - Volume 137, December 2018, Pages 97-103
نویسندگان
Shilian Qu, Hao Sun, Arkadi Kreter, Yue Yuan, Long Cheng, Zhengxing Huang, Ben Xu, Wanqi Chen, Wei Cui, Zhenan Tang, Yuzhen Jia, YouYun Lian, Xiang Liu, Wei Liu,