Plasma wakefield accelerator driven coherent spontaneous emission from an energy chirped electron pulse
Plasma wakefield accelerator driven coherent spontaneous emission from an energy chirped electron pulse
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DOI：
10.1088/1367-2630/ab64ae
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发表时间：
2020-01-01
影响因子：
3.3
通讯作者：
Traczykowski, P.
中科院分区：
文献类型：
--
作者：
Alotaibi, B. M.;Altuijri, R.;Traczykowski, P.
等离子体加速器（Esary等人，2009 Rev.Mod.Phys.811229）是具有在相对短的距离内产生的高峰电流的高能量、低发射率电子束的潜在重要源。因此，它们可以在驱动相干光源中具有重要的应用，相干光源诸如在X射线区域中操作的自由电子激光器（FEL）（McNeil和Thompson 2010 Nat. Photon. 4 814-21）。虽然新型等离子体光电阴极（Hidding等人2012Phys.Rev.Lett. 108 035001）相比于射频驱动的加速器可以提供对电子束的归一化发射度和亮度的数量级改进，实质性挑战是束的能量扩展和啁啾，这可能使FEL操作不可能。在这篇论文中，它表明，这种能量啁啾，高亮度的电子束，与动态演变的电流分布由于弹道聚束在中等能量，可以产生显着的相干辐射输出通过相干自发发射（CSE）的过程（坎贝尔和麦克尼尔2012年，美国联邦电子研究院2012年（奈良，日本））。虽然这种CSE被认为是造成一些自由电子激光诱导的电子聚束在辐射波长，能量啁啾脉冲的动态演变阻尼了任何高增益自由电子激光的相互作用。这一工作为将来等离子体驱动的高增益自放大CSE模式自由电子激光器的发展提供了前景。
Plasma accelerators (Esary et al 2009 Rev. Mod. Phys. 81 1229) are a potentially important source of high energy, low emittance electron beams with high peak currents generated within a relatively short distance. As such, they may have an important application in the driving of coherent light sources such as the Free Electron Laser (FEL) which operate into the x-ray region (McNeil and Thompson 2010 Nat. Photon. 4 814-21). While novel plasma photocathodes (Hidding et al 2012 Phys. Rev. Lett. 108 035001) may offer orders of magnitude improvement to the normalized emittance and brightness of electron beams compared to Radio Frequency-driven accelerators, a substantial challenge is the energy spread and chirp of beams, which can make FEL operation impossible. In this paper it is shown that such an energy-chirped, ultrahigh brightness electron beam, with dynamically evolving current profile due to ballistic bunching at moderate energies, can generate significant coherent radiation output via the process of Coherent Spontaneous Emission (CSE) (Campbell and McNeil 2012 Proc. FEL2012 (Nara, Japan)). While this CSE is seen to cause some FEL-induced electron bunching at the radiation wavelength, the dynamic evolution of the energy chirped pulse dampens out any high-gain FEL interaction. This work may offer the prospect of a future plasma driven FEL operating in the high-gain Self Amplified CSE mode.