摘要
利用基于细致组态非平衡电离模型和非平衡辐射输运的辐射磁流体力学理论,用数值模拟的方法研究了铝丝阵Z箍缩的内爆过程和辐射特性,获得到了合理的内爆动力学图像和与实验结果基本符合的X光辐射功率和总能量等辐射参数,并研究了铝丝阵Z箍缩过程中产生的辐射能谱结构。结果表明:铝丝阵Z箍缩内爆X光辐射是非平衡的,除了存在可以用普朗克能谱近似描述的低能辐射外,还存在大量的K壳层高能辐射。讨论了各种辐射机制对总辐射的贡献,分别计算了线辐射、复合辐射和轫致辐射在各个光子能量范围内所占的份额,讨论了利用高能段连续辐射能谱诊断电子温度的方法,由能谱反推的电子温度,需要进行修正才能反映辐射吸收的影响。
Based on the detailed configurations model, a one-dimensional non-equilibrium magnetohydrodynamics modeling has been developed to study the physical process of aluminum wire array Z-pinch implosion and non-equilibrium radiation. The code solves the transfer of line radiation by using escape probability approximation, and solves the transfer of continuum by using multi-group diffusion approximation. It is shown that the calculated peak power, FWHM（full width at half magnitude） and total energy of the radiation pulse accord well with the experimental results besides the agreement of the dynamics of ~pinch implosion. The energy spectrum of the total radiation has been discussed, which shows the substantial importance of non-equilibrium radiation in Z-pinch implosion. The role of three channels of radiation including line radiaion, recombination radiation and bremsstrahlung radiation has been evaluated. In addition, the method to diagnose electron temperature using high energy continuum has been discussed, which shows that a modified factor smaller than unity should be multiplied to the derived electron temperature from the energy spectrum because of the absorption of radiation.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第2期341-347,共7页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10575014
10635050
10775021)
国家973计划项目(2007CB814800)
关键词
铝丝阵Z箍缩内爆
细致组态
非平衡辐射
逃逸概率近似
高能连续谱
aluminum wire array Z-pinch implosion
detailed configurations
non equilibrium radiation
escape proba- bility approximation
high energy continuum
