Transport mechanism of MeV protons in tapered glass capillaries
Transport mechanism of MeV protons in tapered glass capillaries
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DOI：
10.1063/1.3624617
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发表时间：
2011-08
影响因子：
3.2
通讯作者：
J. Hasegawa;S. Jaiyen;C. Polee;N. Chankow;Y. Oguri
中科院分区：
文献类型：
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作者：
J. Hasegawa;S. Jaiyen;C. Polee;N. Chankow;Y. Oguri
为了研究 MeV 质子在锥形玻璃毛细管中的传输机制，测量了由具有不同锥角的 20 μm 出口毛细管聚焦的质子微束的空间分辨能谱。还进行了三维蒙特卡罗 (MC) 模拟来支持实验并更详细地追踪毛细管中的每个颗粒。质子能量分布对出射角的依赖性证明，毛细管聚焦质子束由两种不同的成分组成，即直接穿过毛细管而不与毛细管壁碰撞的质子和被毛细管内壁散射的质子。此外，发现锥形玻璃毛细管的聚焦效应主要是由于散射光束分量。 MC 模拟很好地再现了实验结果，并表明对于具有凸形内壁的毛细管，光束聚焦比可以达到 1.6-2.4。散射质子在毛细管玻璃中的飞行距离...
To investigate the transport mechanism of MeV protons in tapered glass capillaries, spatially resolved energy spectra were measured for proton microbeams focused by 20-μm-outlet capillaries having various taper angles. Three-dimensional Monte Carlo (MC) simulations were also performed to support the experiments and trace each particle in the capillary in more detail. The dependence of the proton energy distribution on the outgoing angle proved that the capillary-focused proton beam consists of two different components, protons traveling straight through the capillary without colliding with the capillary wall and protons scattered by the capillary inner wall. Moreover, the focusing effect of the tapered glass capillary was found to be mainly due to the scattered beam component. The MC simulations well reproduced the experimental results and showed that beam focusing ratios of 1.6–2.4 are possible with capillaries having a convex inner wall. The flight distance of the scattered proton in the capillary glass...