Monte Carlo approach to calculate proton stopping in warm dense matter within particle-in-cell simulations.
Monte Carlo approach to calculate proton stopping in warm dense matter within particle-in-cell simulations.
复制标题
DOI：
10.1103/physreve.95.023207
复制
发表时间：
2016-07
期刊：
影响因子：
--
通讯作者：
D. Wu;Xiangqun He;W. Yu;S. Fritzsche
中科院分区：
文献类型：
--
作者：
D. Wu;Xiangqun He;W. Yu;S. Fritzsche
将质子在热致密物质中停止的蒙特卡罗方法实现到现有的细胞内粒子编码中。该方法基于多重电子-电子、电子-离子和离子-离子二元碰撞，并考虑了等离子体中的自由电子和束缚电子。这种方法使人们能够以比现有理论处理更自然的方式计算粒子的停止。在低温极限下，当“所有”电子都被束缚在原子核上时，停止功率与贝特-布洛赫公式的预测一致，与美国国家标准与技术研究所数据库的数据一致。在较高的温度下，一些束缚电子被电离，这增加了等离子体中的停止能力，正如A. B. Zylstra等人所证明的那样。[j] .中国生物医学工程学报，2015,29 (2):481 - 481 . [j] .中国生物医学工程学报。在更高的温度下，电离程度达到最大，从而降低了停止功率，因为在目标中，投射质子束和热等离子体之间的碰撞频率受到抑制。
A Monte Carlo approach to proton stopping in warm dense matter is implemented into an existing particle-in-cell code. This approach is based on multiple electron-electron, electron-ion, and ion-ion binary collision and accounts for both the free and the bound electrons in the plasmas. This approach enables one to calculate the stopping of particles in a more natural manner than existing theoretical treatment. In the low-temperature limit, when "all" electrons are bound to the nucleus, the stopping power coincides with the predictions from the Bethe-Bloch formula and is consistent with the data from the National Institute of Standard and Technology database. At higher temperatures, some of the bound electrons are ionized, and this increases the stopping power in the plasmas, as demonstrated by A. B. Zylstra et al. [Phys. Rev. Lett. 114, 215002 (2015)]PRLTAO0031-900710.1103/PhysRevLett.114.215002. At even higher temperatures, the degree of ionization reaches a maximum and thus decreases the stopping power due to the suppression of collision frequency between projected proton beam and hot plasmas in the target.