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GEANT4-Based Simulation on Shielding and Radiation Effects of SPE Protons in Semiconductors
LU Wei, WANG Tongquan, WANG Shangwu, CHEN Dayi, WANG Xinggong
CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2009, 26 (4): 591-596.  
Abstract371)      PDF (336KB)(1983)      
We simulate radiation effects of solar cosmic protons on spacecraft and satellites with a Monte Carlo software GEANT4.Damage induced by proton irradiation and shielding of Al layer are calculated.Linear energy transfer and range in materials agree well with referenced data. Energy deposited in incident direction shows a Bragg curve and nonelastic interactions show important impact.In Si recoil atoms are mainly distributed along incident proton trajectory and isolated recoils distribute along lateral direction with lower concentration. Al shielding layer shows a shielding on high energetic protons.Shielding is hardly changed as layer thickness is larger than 10mm.On the contrary,secondary production increases obviously.
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A Spectral Method for Fokker-Planck-Landau Equation
WANG Yibo, WANG Shangwu
CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2007, 24 (2): 153-158.  
Abstract497)      PDF (338KB)(1077)      
A spectral method with FFT transformation is introduced in the numerical solution of the Fokker-Planck-Landau equation in describing charged particle transport in plasma.The time evolution of the distribution function in the velocity-space is studied with a "space-homogeneous" condition.Numerical results show that conservations of mass,momentum and energy are held precisely.In addition,the computation cost is reduced considerably due to the adoption of FFT transformation.
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