Practical considerations for the ion channel free-electron laser
Practical considerations for the ion channel free-electron laser
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离子通道自由电子激光器的实际考虑
DOI：
10.1117/12.2178989
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发表时间：
2015
影响因子：
4.6
通讯作者：
D. Jaroszynski
中科院分区：
文献类型：
--
作者：
B. Ersfeld;R. Bonifacio;S. Chen;M. Islam;D. Jaroszynski
离子通道激光器（ICL）已被提议作为自由电子激光器（FEL）的替代品，用离子通道中的周期性电子感应加速器运动代替波荡器的周期性磁场引起的电子偏转。离子通道可以通过使密集的高能电子束或强激光脉冲穿过等离子体来产生。 ICL 有潜力取代基于磁波荡器的 FEL，从而产生非常紧凑的相干 X 射线源。特别是，将 ICL 与激光等离子体尾场加速器耦合将使相干光源的尺寸减小几个数量级。 FEL 和 ICL 之间的一个重要区别是横向振荡的波长：前者由波荡器周期固定，而后者取决于电子感应加速器振幅，因此必须将其视为变量。即便如此，ICL 的所得方程在形式上与考虑了空间电荷的 FEL 的方程相似，因此可以应用 FEL 的完善形式。与 FEL 相比，幅度依赖性导致了额外的要求，例如电子感应加速器振幅的小范围扩展。我们将解决这些要求以及由此产生的实现 ICL 的实际考虑因素，并给出在 UV 基本波长下运行的参数，其中谐波延伸到 X 射线。
The ion-channel laser (ICL) has been proposed as an alternative to the free-electron laser (FEL), replacing the deflection of electrons by the periodic magnetic field of an undulator with the periodic betatron motion in an ion channel. Ion channels can be generated by passing dense energetic electron bunches or intense laser pulses through plasma. The ICL has potential to replace FELs based on magnetic undulators, leading to very compact coherent X-ray sources. In particular, coupling the ICL with a laser plasma wakefield accelerator would reduce the size of a coherent light source by several orders of magnitude. An important difference between FEL and ICL is the wavelength of transverse oscillations: In the former it is fixed by the undulator period, whereas in the latter it depends on the betatron amplitude, which therefore has to be treated as variable. Even so, the resulting equations for the ICL are formally similar to those for the FEL with space charge taken into account, so that the well-developed formalism for the FEL can be applied. The amplitude dependence leads to additional requirements compared to the FEL, e.g. a small spread of betatron amplitudes. We shall address these requirements and the resulting practical considerations for realizing an ICL, and give parameters for operation at UV fundamental wavelength, with harmonics extending into X-rays.
影响因子：
8.6
作者：
Brunetti, E.;Shanks, R. P.;Jaroszynski, D. A.
通讯作者：
Jaroszynski, D. A.