کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1564906 999777 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Macroscopic rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials
ترجمه فارسی عنوان
مدلسازی معادلات نرخ مک کوکوکوپس از تلهپوشی / انهدام ایزوتوپهای هیدروژن در مواد تنگستن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
چکیده انگلیسی
Relevant parameters for trapping of Hydrogen Isotopes (HIs) in polycrystalline tungsten are determined with the MHIMS code (Migration of Hydrogen Isotopes in MaterialS) which is used to reproduce Thermal Desorption Spectrometry experiments. Three types of traps are found: two intrinsic traps (detrapping energy of 0.87 eV and 1.00 eV) and one extrinsic trap created by ion irradiation (detrapping energy of 1.50 eV). Then MHIMS is used to simulate HIs retention at different fluences and different implantation temperatures. Simulation results agree well with experimental data. It is shown that at 300 K the retention is limited by diffusion in the bulk. For implantation temperatures above 500 K, the retention is limited by trap creation processes. Above 600 K, the retention drops by two orders of magnitude as compared to the retention at 300 K. With the determined detrapping energies, HIs outgassing at room temperature is predicted. After ions implantation at 300 K, 45% of the initial retention is lost to vacuum in 300 000 s while during this time the remaining trapped HIs diffuse twice as deep into the bulk.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 467, Part 1, December 2015, Pages 424-431
نویسندگان
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