排序方式: 共有70条查询结果,搜索用时 15 毫秒
21.
22.
Energy loss of a fast-electron beam due to the excitation of collective oscillation in hot plasma 下载免费PDF全文
Energy loss due to a fast-electron beam interacting with the hot plasma at a high density is analysed theoretically. By splitting the particle density fluctuations into the individual part due to the random thermal motion of the individual electrons and the collective part due to plasma-wave excitation, we are concerned with the collective interaction of the relativistic plasma electrons resulting from the Coulomb interactions. Consequently, we derive the frequency of the hot plasma and the "Debye length" with the modification of the relativistic effect. And finally we calculate the energy loss of a fast-electron beam due to the excitation of collective oscillation in the hot plasma. 相似文献
23.
双粒子模型的基础是描述原子之间相互作用势为EAM(embedded atom method)势的Monte Carlo模拟. 模型建议:在Ni3Al晶界弛豫时,微量元素原子既被看作为偏析子又被看作为诱发子. 作为偏析子它在晶界偏析(或富集),作为诱发子它诱发Ni原子在晶界偏析(或富集). 可见本模型能解析共偏析(或共富集)现象. 根据正(或诱发子)效应与负(或偏析子)效应的联合影响,模型解释了Ni在Ni3Al晶界最明显富集现象.
关键词:
偏析子与诱发子
基体效应
在晶界共富集
晶界内聚性 相似文献
24.
基于相对论性激光-等离子体动力学理论,研究了相对论性激光-等离子体系统中圆偏振入射脉冲激光和等离子体相互作用对激光脉冲宽度的影响. 具体分析了在不同初始物理参数下脉冲激光的脉冲宽度在等离子体传播过程中的变化情况,重点分析了激光脉冲在等离子中压缩. 计算结果表明增加入射激光的强度和入射脉冲宽度以及减小等离子体的初始密度,能够有效地实现脉冲宽度在等离子体中压缩;当激光脉冲的初始参数a0=0.12和τ=70以及等离子体密度n0=0.3时,脉冲宽度相对压缩T/τ接近于1/10,从而给出了激光压缩的理论优化参数.
关键词:
相对论性激光-等离子体
激光脉冲宽度
等离子体密度
自压缩 相似文献
25.
26.
在超强fs激光与氘团簇的相互作用中, 分析了可以引发核聚变的高能氘核产生的原因,提出了团簇双重膨胀的机制,计算了氘核动能及团簇解体的时间, 为选取合适的激光脉冲宽度参数提供参考. Considering the Coulomb explosion induced by the interaction of a deuterium cluster target with ultra intensity femtosecond laser,the causation which generate energetic deuterium nuclei for the fusion has been analyzed. The mechanism for the dual explosion of deuterium cluster is proposed, and hence the velocity of deuterium nuclei and the expansion time of deuterium ion clusters have been estimated. 相似文献
27.
28.
29.
30.