Few femtosecond, few kiloampere electron bunch produced by a laser-plasma accelerator
Few femtosecond, few kiloampere electron bunch produced by a laser-plasma accelerator
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DOI：
10.1038/nphys1872
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发表时间：
2011-03-01
期刊：
影响因子：
19.6
通讯作者：
Faure, J.
中科院分区：
文献类型：
--
作者：
Lundh, O.;Lim, J.;Faure, J.
由超强和超短激光脉冲与等离子体（1）相互作用驱动的粒子加速器可以产生每米数百吉伏的加速电场，并提供具有低能量分布（2-5）、低发射度（6）的高质量电子束。峰值能量高达1 GeV（7，8）。此外，预计他们可能很快就能产生短于传统的粒子加速器产生的电子脉冲，下降到飞秒的持续时间和less. In这里，我们提出了宽带光谱测量相干跃迁辐射，我们使用的时间表征。我们的分析表明，使用受控光学注入产生的电子束（9）包含时间特征，其可以被识别为15 pC、1.4-1.8 fs电子聚束（均方根），导致取决于聚束形状的3-4 kA的峰值电流。我们预计，这些结果将对短脉冲和短波长辐射源（10，11）等新兴应用产生强烈影响，并将有利于实现实验室规模的自由电子激光器（12-14）。
Particle accelerators driven by the interaction of ultraintense and ultrashort laser pulses with a plasma(1) can generate accelerating electric fields of several hundred gigavolts per metre and deliver high-quality electron beams with low energy spread(2-5), low emittance(6) and up to 1 GeV peak energy(7,8). Moreover, it is expected they may soon be able to produce bursts of electrons shorter than those produced by conventional particle accelerators, down to femtosecond durations and less. Here we present wide-band spectral measurements of coherent transition radiation which we use for temporal characterization. Our analysis shows that the electron beam, produced using controlled optical injection(9), contains a temporal feature that can be identified as a 15 pC, 1.4-1.8 fs electron bunch (root mean square) leading to a peak current of 3-4 kA depending on the bunch shape. We anticipate that these results will have a strong impact on emerging applications such as short-pulse and short-wavelength radiation sources(10,11), and will benefit the realization of laboratory-scale free-electron lasers(12-14).