کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7987510 | 1515278 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterizing Low-Z erosion and deposition in the DIII-D divertor using aluminum
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Characterizing Low-Z erosion and deposition in the DIII-D divertor using aluminum Characterizing Low-Z erosion and deposition in the DIII-D divertor using aluminum](/preview/png/7987510.png)
چکیده انگلیسی
We present measurements and modeling of aluminum erosion and redeposition experiments in separate helium and deuterium low power, low density L-mode plasmas at the outer divertor strike point of DIII-D to provide a low-Z material benchmark dataset for tokamak erosion-deposition modeling codes. Coatings of Al â¼100Â nm thick were applied to ideal (smooth) and realistic (rough) surfaces and exposed to repeat plasma discharges using the DiMES probe. Redeposition in all cases was primarily in the downstream toroidal field direction, evident from both in-situ spectroscopic and post-mortem non-spectroscopic measurements. The gross Al erosion yield was estimated from film thickness change measurements of small area samples, and was found to be â¼40-70% of the expected erosion yield based on theoretical physical sputtering yields after including sputtering by a 1-3% carbon impurity. The multi-step redeposition and re-erosion process, and hence the measured net erosion yield and material migration patterns, were found to be influenced by the surface roughness and/or porosity. A time-dependent model of material migration accounting for deposit accumulation in hidden areas was developed to reproduce the measurements in these experiments and determine a redeposition probability distribution function for sputtered atoms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Materials and Energy - Volume 12, August 2017, Pages 441-446
Journal: Nuclear Materials and Energy - Volume 12, August 2017, Pages 441-446
نویسندگان
C.P. Chrobak, R.P. Doerner, P.C. Stangeby, W.R. Wampler, D.L. Rudakov, G.M. Wright, T. Abrams, R. Ding, J.D. Elder, J. Guterl, H.Y. Guo, C. Lasnier, D.M. Thomas, A.W. Leonard, D.A. Buchenauer, A.G. McLean, J.G. Watkins, G.R. Tynan,