Observation of longitudinal and transverse self-injections in laser-plasma accelerators

被引：102

作者：

Corde, S. ^{[1
]}

Thaury, C. ^{[1
]}

Lifschitz, A. ^{[1
]}

Lambert, G. ^{[1
]}

Phuoc, K. Ta ^{[1
]}

Davoine, X. ^{[2
]}

Lehe, R. ^{[1
]}

Douillet, D. ^{[1
]}

Rousse, A. ^{[1
]}

Malka, V. ^{[1
]}

机构：

[1] Ecole Polytech, CNRS UMR7639, ENSTA ParisTech, Lab Opt Appl, F-91762 Palaiseau, France

[2] CEA, DAM, DIF, F-91297 Arpajon, France

来源：

NATURE COMMUNICATIONS | 2013年 / 4卷

基金：

欧洲研究理事会;

关键词：

MONOENERGETIC ELECTRON-BEAMS; WAKE-FIELD ACCELERATION; WAKEFIELD ACCELERATOR; DRIVEN; DENSITY; REGIME;

D O I：

10.1038/ncomms2528

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Laser-plasma accelerators can produce high-quality electron beams, up to giga electronvolts in energy, from a centimetre scale device. The properties of the electron beams and the accelerator stability are largely determined by the injection stage of electrons into the accelerator. The simplest mechanism of injection is self-injection, in which the wakefield is strong enough to trap cold plasma electrons into the laser wake. The main drawback of this method is its lack of shot-to-shot stability. Here we present experimental and numerical results that demonstrate the existence of two different self-injection mechanisms. Transverse self-injection is shown to lead to low stability and poor-quality electron beams, because of a strong dependence on the intensity profile of the laser pulse. In contrast, longitudinal injection, which is unambiguously observed for the first time, is shown to lead to much more stable acceleration and higher-quality electron beams.

引用

页数：7

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