Resonantly Enhanced Betatron Hard X-rays from Ionization Injected Electrons in a Laser Plasma Accelerator.
Resonantly Enhanced Betatron Hard X-rays from Ionization Injected Electrons in a Laser Plasma Accelerator.
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激光等离子体加速器中电离注入电子产生的共振增强电子感应加速器硬 X 射线
DOI：
10.1038/srep27633
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发表时间：
2016-06-08
影响因子：
4.6
通讯作者：
Zhang J
中科院分区：
文献类型：
--
作者：
Huang K;Li YF;Li DZ;Chen LM;Tao MZ;Ma Y;Zhao JR;Li MH;Chen M;Mirzaie M;Hafz N;Sokollik T;Sheng ZM;Zhang J
在激光韦克菲尔德加速器（LWFA）中，电子振荡产生的超快电子感应加速器X射线辐射是一种很有前途的辐射源。Betatron X射线通常是通过自注入电子束产生的，这是不可控制的，也不是针对X射线产率进行优化的。在这里，我们提出了一种新的方法，通过电离注入从氮的K壳层电子到加速桶明亮的硬X射线发射。获得了8 × 108个光子/次的总光子产额和108个能量大于110 keV的光子。在相同的激光参数下，产率比氦原子自注入模式高10倍。模拟表明，电离注入的电子被迅速加速到驱动激光区，随后被驱动到电子感应加速器共振。本方案使LWFA单级电子感应加速器辐射扩展到第三代同步加速器无法提供的亮γ辐射。
Ultrafast betatron x-ray emission from electron oscillations in laser wakefield acceleration (LWFA) has been widely investigated as a promising source. Betatron x-rays are usually produced via self-injected electron beams, which are not controllable and are not optimized for x-ray yields. Here, we present a new method for bright hard x-ray emission via ionization injection from the K-shell electrons of nitrogen into the accelerating bucket. A total photon yield of 8 × 108/shot and 108photons with energy greater than 110 keV is obtained. The yield is 10 times higher than that achieved with self-injection mode in helium under similar laser parameters. The simulation suggests that ionization-injected electrons are quickly accelerated to the driving laser region and are subsequently driven into betatron resonance. The present scheme enables the single-stage betatron radiation from LWFA to be extended to bright γ-ray radiation, which is beyond the capability of 3rdgeneration synchrotrons.