Terahertz-driven linear electron acceleration.
Terahertz-driven linear electron acceleration.
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DOI：
10.1038/ncomms9486
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发表时间：
2015-10-06
影响因子：
16.6
通讯作者：
Kärtner FX
中科院分区：
文献类型：
--
作者：
Nanni EA;Huang WR;Hong KH;Ravi K;Fallahi A;Moriena G;Miller RJ;Kärtner FX
电子加速器的成本、尺寸和可用性取决于可实现的加速梯度。传统的高亮度射频加速结构在30 - 50 MeV m − 1梯度下工作。用光学或红外源驱动的电子加速器已经证明了比用常规射频结构可实现的加速梯度高几个数量级。然而，激光驱动的韦克菲尔德加速器需要强烈的飞秒源，而直接激光驱动的加速器由于工作波长短而受到低聚束电荷、亚微米公差和亚飞秒定时要求的影响。在这里，我们演示了线性加速电子与keV的能量增益使用光学产生的太赫兹脉冲。太赫兹驱动的加速结构使得高梯度电子/质子加速器具有简单的加速结构、高重复率和每束团显著的电荷。这些具有极短电子束的超紧凑太赫兹加速器具有巨大的潜力，可以对自由电子激光器，线性对撞机，超快电子衍射，X射线科学以及X射线和电子束的医学治疗产生变革性影响。 光脉冲提供了一种方法来创建粒子加速器，其大小是传统方法的一小部分。在这里，作者演示了具有千电子伏能量增益的电子的线性加速，并使用光学产生的太赫兹脉冲在极短的聚束中进行。
The cost, size and availability of electron accelerators are dominated by the achievable accelerating gradient. Conventional high-brightness radio-frequency accelerating structures operate with 30–50 MeV m−1 gradients. Electron accelerators driven with optical or infrared sources have demonstrated accelerating gradients orders of magnitude above that achievable with conventional radio-frequency structures. However, laser-driven wakefield accelerators require intense femtosecond sources and direct laser-driven accelerators suffer from low bunch charge, sub-micron tolerances and sub-femtosecond timing requirements due to the short wavelength of operation. Here we demonstrate linear acceleration of electrons with keV energy gain using optically generated terahertz pulses. Terahertz-driven accelerating structures enable high-gradient electron/proton accelerators with simple accelerating structures, high repetition rates and significant charge per bunch. These ultra-compact terahertz accelerators with extremely short electron bunches hold great potential to have a transformative impact for free electron lasers, linear colliders, ultrafast electron diffraction, X-ray science and medical therapy with X-rays and electron beams. Pulses of light offer a way to create particle accelerators that are a fraction of the size of conventional approaches. Here, the authors demonstrate the linear acceleration of electrons with kiloelectronvolt energy gain and in extremely short bunches using optically-generated terahertz pulses.