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A novel X-ray generation mechanism by relativistic flying mirror

一种新颖的相对论飞镜X射线产生机制

基本信息

批准号：
20244065
负责人：
BULANOV Sergei
金额：
$ 30.95万
依托单位：
Japan Atomic Energy Agency
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

We investigated a novel x-ray generation mechanism (relativistic flying mirror) using the nonlinear interaction of a high-intensity laser with plasma. In an underdense plasma, the laser excites a wake wave and form cusp density profile in the highly nonlinear regime. The cusp partially reflects a counter-propagating laser pulse in the form of X-rays due to the double Doppler effect. We implemented an experimental setup with two counter-propagating laser pulses interacting with the helium gas target. The observed reflected photon wavelength ranged from 12 nm to 20 nm, while the incident laser wavelength was 820 nm. The reflectivity in terms of photon number was 2×10^<-5>. This is close to the theoretical estimate, which proves the feasibility and efficiency of the flying mirror scheme. In addition, with a single laser pulse focused onto a helium gas target with a relativistic intensity, we observed in the forward direction a high-order harmonic radiation with unique properties. The harmonic extend to the 'water window' spectral region and contain more than 300 resolved orders. The harmonics with both even and odd orders of the same intensities are generated by both linearly and circularly polarized laser pulses. We propose a new mechanism of high-order harmonics generation that explains our experimental results. This mechanism is based on catastrophe theory, which predicts structurally stable electron density singularity formation inside the laser pulse. Computer simulations show the singularity formation and associated harmonic emission, in agreement with the experimental results.

我们利用高强度激光与等离子体的非线性相互作用研究了一种新颖的 X 射线生成机制（相对论飞镜）。在低密度等离子体中，激光激发尾波并在高度非线性状态下形成尖点密度分布。由于双多普勒效应，尖点部分地反射 X 射线形式的反向传播激光脉冲。我们实施了一个实验装置，其中两个反向传播的激光脉冲与氦气目标相互作用。观察到的反射光子波长范围为12 nm至20 nm，而入射激光波长为820 nm。以光子数表示的反射率为2×10 ^ -5 。这与理论估计接近，证明了飞镜方案的可行性和效率。此外，通过将单个激光脉冲聚焦到具有相对论强度的氦气目标上，我们在前向观察到具有独特性质的高次谐波辐射。谐波延伸至“水窗”光谱区域并包含 300 多个解析阶次。线性和圆偏振激光脉冲都会产生具有相同强度的偶数次和奇数次谐波。我们提出了一种新的高次谐波产生机制来解释我们的实验结果。该机制基于突变理论，该理论预测激光脉冲内结构稳定的电子密度奇点的形成。计算机模拟显示了奇点的形成和相关的谐波发射，与实验结果一致。

项目成果

期刊论文数量（75）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Propagation-based phase-contrast enhancement of nanostructure images using a debris-free femtosecond-laser-driven cluster-based plasma soft x-ray source and an LiF crystal detector

DOI：
10.1364/ao.48.006271
发表时间：
2009-11-10
期刊：
APPLIED OPTICS
影响因子：
1.9
作者：
Pikuz, Tatiana A.;Faenov, Anatoly Ya.;Bulanov, Sergei V.
通讯作者：
Bulanov, Sergei V.

Generation of stable and low-divergence 10-MeV quasimonoenergetic electron bunch using argon gas jet

DOI：
10.1103/physrevstab.12.082801
发表时间：
2009-08
期刊：
Physical Review Special Topics-accelerators and Beams
影响因子：
0
作者：
M. Mori;K. Kondo;Y. Mizuta;M. Kando;H. Kotaki;M. Nishiuchi;M. Kado;A. Pirozhkov;K. Ogura
通讯作者：
M. Mori;K. Kondo;Y. Mizuta;M. Kando;H. Kotaki;M. Nishiuchi;M. Kado;A. Pirozhkov;K. Ogura

Extreme Field Science with Ultrahigh Power Lasers

超高功率激光器的极限场科学