Reflection properties of hydrogen ions at helium irradiated tungsten surfaces
Reflection properties of hydrogen ions at helium irradiated tungsten surfaces
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氢离子在氦辐照钨表面的反射特性
DOI：
10.1088/0031-8949/t167/1/014044
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发表时间：
2016
期刊：
影响因子：
2.9
通讯作者：
H Yamaoka
中科院分区：
文献类型：
--
作者：
K Doi;Y Tawada;HT Lee;S Kato;N Tanaka;M Sasao;M Kisaki;M Nishiura;Y Matsumoto;T Kenmotsu;M Wada;Y Ueda;H Yamaoka
He轰击制备的纳米结构W表面在注入1keV H+束时表现出氢离子反射的特征角分布。一个可以在真空室中移动的磁动量分析仪测量了反射离子的强度和能量的角度依赖性。与本征多晶W相比，He辐照钨样品观察到更宽的角分布。反射离子的强度和能量均按多晶W、含W的He泡和绒毛W的顺序递减。基于原子碰撞的经典轨道蒙特卡罗模拟表明，由于碰撞次数的增加，表面附近较低的原子密度可以使反射系数降低。
Nanostructured W surfaces prepared by He bombardment exhibit characteristic angular distributions of hydrogen ion reflection upon injection of 1 keV H+ beam. A magnetic momentum analyzer that can move in the vacuum chamber has measured the angular dependence of the intensity and the energy of reflected ions. Broader angular distributions were observed for He-irradiated tungsten samples compared with that of the intrinsic polycrystalline W. Both intensity and energy of reflected ions decreased in the following order: the polycrystalline W, the He-bubble containing W, and the fuzz W. Classical trajectory Monte Carlo simulations based on Atomic Collision in Amorphous Target code suggests that lower atom density near the surface can make the reflection coefficients lower due to increasing number of collisions.