کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10128761 | 1645147 | 2018 | 45 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
One-dimensional kinetic simulations of plume expansion induced by multi-pulse laser irradiation in the burst mode at 266â¯nm wavelength
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Expansion of a plume into an argon background gas induced by irradiation of a copper target by a burst of nanosecond laser pulses is studied based on a one-dimensional hybrid computational model, including a thermal model of the irradiated target and a kinetic model of neutral gas flows. The kinetic model is implemented in the form of the Direct Simulation Monte Carlo method. The simulations are performed for a laser with 266â¯nm wavelength, producing bursts of 1, 3, and 7 pulses of 10 ns duration with the peak-to-peak separation varying from zero to 60â¯ns, in the range of argon pressure from zero to 1â¯bar. It is found that multi-pulse irradiation induces plumes with complicated internal structures, including cascades of primary and secondary shock waves. The mechanism of interaction between shock waves depends on the background gas pressure. The distributions of temperature and density in the plumes are strongly affected by the inter-pulse separation and number of pulses, which determine the conditions of plasma ignition. Simulations performed based on a model, where ionization and absorption in the plume are accounted for, suggest that tuning the parameters of the burst allows one to reduce the effect of plasma shielding.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 157, November 2018, Pages 361-375
Journal: Vacuum - Volume 157, November 2018, Pages 361-375
نویسندگان
Omid A. Ranjbar, Zhibin Lin, Alexey N. Volkov,