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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of electrons and x-rays produced using chirped laser pulses in a laser wakefield accelerator
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Characterization of electrons and x-rays produced using chirped laser pulses in a laser wakefield accelerator

机译：在激光尾场加速器中使用chi激光脉冲产生的电子和X射线的表征

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摘要

The electron injection process into a plasma-based laser wakefield accelerator can be influenced by modifying the parameters of the driver pulse. We present an experimental study on the combined effect of the laser pulse duration, pulse shape, and frequency chirp on the electron injection and acceleration process and the associated radiation emission for two different gas types-a 97.5% He and 2.5% N-2 mixture and pure He. In general, the shortest pulse duration with minimal frequency chirp produced the highest energy electrons and the most charge. Pulses on the positive chirp side sustained electron injection and produced higher charge, but lower peak energy electrons, compared with negatively chirped pulses. A similar trend was observed for the radiant energy. The relationship between the radiant energy and the electron charge remained linear over a threefold change in the electron density and was independent of the drive pulse characteristics. X-ray spectra showed that ionization injection of electrons into the wakefield generally produced more photons than self-injection for all pulse durations/frequency chirp and had less of a spread in the number of photons around the peak x-ray energy.
机译：可以通过修改驱动器脉冲的参数来影响基于等离子体的激光尾场加速器中的电子注入过程。我们对两种不同类型的气体-97.5％He和2.5％N-2混合物的激光脉冲持续时间，脉冲形状和频率chi对电子注入和加速过程以及相关的辐射发射的综合影响进行了实验研究和纯净的他。通常，最短的脉冲持续时间和最小的线性chi产生最大的能量电子和最多的电荷。与负chi脉冲相比，正chi脉冲维持电子注入并产生更高的电荷，但峰值能量电子更低。对于辐射能也观察到类似的趋势。辐射能和电子电荷之间的关系在电子密度的三倍变化中保持线性关系，并且与驱动脉冲特性无关。 X射线光谱显示，在所有脉冲持续时间/频率线性调频下，将电子电离注入到尾场中通常比自注入产生更多的光子，并且在峰值X射线能量附近的光子数量分布较少。

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