کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9793829 | 1514281 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Time resolved deposition measurements in NSTX
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Time-resolved measurements of deposition in current tokamaks are crucial to gain a predictive understanding of deposition with a view to mitigating tritium retention and deposition on diagnostic mirrors expected in next-step devices. Two quartz crystal microbalances have been installed on NSTX at a location 0.77 m outside the last closed flux surface. This configuration mimics a typical diagnostic window or mirror. The deposits were analyzed ex-situ and found to be dominantly carbon, oxygen and deuterium. A rear facing quartz crystal recorded deposition of lower sticking probability molecules at 10% of the rate of the front facing one. Time resolved measurements over a 4-week period with 497 discharges, recorded 29.2 μg/cm2 of deposition, however surprisingly, 15.9 μg/cm2 of material loss occurred at 7 discharges. The net deposited mass of 13.3 μg/cm2 matched the mass of 13.5 μg/cm2 measured independently by ion beam analysis. Monte Carlo modeling suggests that transient processes are likely to dominate the deposition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volumes 337â339, 1 March 2005, Pages 129-133
Journal: Journal of Nuclear Materials - Volumes 337â339, 1 March 2005, Pages 129-133
نویسندگان
C.H. Skinner, H. Kugel, A.L. Roquemore, J. Hogan, W.R. Wampler, the NSTX team the NSTX team,