CAJ | 학술논문

建立了复合靶的蒙特卡罗粒子输运计算模型，以“闪光二号”加速器为电子束源，模拟了电子和光子在不同材料中的输运规律，研究了钽和聚乙烯组成的复合阳极靶对辐射X射线场的影响。模拟结果表明：随着钽厚度的增加，辐射X射线平均能量增大，能量转换效率先增大后减小；聚乙烯可明显减小辐射场中的电子份额。当钽和聚乙烯的厚度分别取20μm、3 mm时，辐射场中平均光子能量为102.68 keV ；光子总能量为88.62 J ，远大于电子总能量0.02 J；X射线能量转换效率为0.57％。根据数值模拟结果和实验条件设计了复合靶，计算和测得的X射线平均能量分别为108和121 keV ，二者符合得较好。
건립료복합파적몽특잡라입자수운계산모형，이“섬광이호”가속기위전자속원，모의료전자화광자재불동재료중적수운규률，연구료단화취을희조성적복합양겁파대복사X사선장적영향。모의결과표명：수착단후도적증가，복사X사선평균능량증대，능량전환효솔선증대후감소；취을희가명현감소복사장중적전자빈액。당단화취을희적후도분별취20μm、3 mm시，복사장중평균광자능량위102.68 keV ；광자총능량위88.62 J ，원대우전자총능량0.02 J；X사선능량전환효솔위0.57％。근거수치모의결과화실험조건설계료복합파，계산화측득적X사선평균능량분별위108화121 keV ，이자부합득교호。
Electrons energy distribution of Flash-Ⅱ accelerator was calculated using current and voltage . The Monte Carlo N-particle transport code was used for the radiation simulation , and the influence of target thickness and structure on X-ray parameters was simulated .The numerical results indicate that the average energy of photons increases with tantalum target thickness ,and the conversion efficiency of X-ray has a maximum value . The ratio of total energy of photons to forward electrons distinctly decreases when polythene materials are added behind tantalum target .As an example ,for 20 μm tantalum and 3 mm polythene targets , the average energy of photons is 102.68 keV ,X-ray energy is 88.62J which is greater than 0.02J of the forward electrons energy ,and the conversion efficiency is 0.57% .One composite target was designed for Flash-Ⅱ accelerator based on the simulation results and engineering conditions ,and the simulation results agree well with the measured data .