Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers.,Physical Review Letters

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Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-04-03 , DOI: 10.1103/physrevlett.124.134801
Jingyi Tang _{1,

2} , Randy Lemons _{1,

3} , Wei Liu ₁ , Sharon Vetter ₁ , Timothy Maxwell ₁ , Franz-Josef Decker ₁ , Alberto Lutman ₁ , Jacek Krzywinski ₁ , Gabriel Marcus ₁ , Stefan Moeller ₁ , Zhirong Huang _{1,

2} , Daniel Ratner ₁ , Sergio Carbajo _{1,

3}

Affiliation

Microbunching instability (MBI) driven by beam collective effects is known to be detrimental to high-brightness storage rings, linacs, and free-electron lasers (FELs). One known way to suppress this instability is to induce a small amount of energy spread to an electron beam by a laser heater. The distribution of the induced energy spread greatly affects MBI suppression and can be controlled by shaping the transverse profile of the heater laser. Here, we present the first experimental demonstration of effective MBI suppression using a LG_{01} transverse laser mode and compare the improved results with respect to traditional Gaussian transverse laser mode at the Linac Coherent Light Source. The effects on MBI suppression are characterized by multiple downstream measurements, including longitudinal phase space analysis and coherent radiation spectroscopy. We also discuss the role of LG_{01} shaping in soft x-ray self-seeded FEL emission, one of the most advanced operation modes of a FEL for which controlled suppression of MBI is critical.

中文翻译：

Laguerre-Gaussian模式激光加热器，用于抑制自由电子激光器中的微束化不稳定性。

已知由束聚集效应驱动的微束不稳定性（MBI）对高亮度存储环，直线加速器和自由电子激光器（FEL）有害。抑制这种不稳定性的一种已知方法是通过激光加热器引起少量能量散布到电子束。感应能量散布的分布极大地影响了MBI抑制，可以通过对加热激光器的横向轮廓进行整形来控制。在这里，我们展示了使用LG_ {01}横向激光模式有效抑制MBI的第一个实验演示，并在直线加速器相干光源上比较了传统高斯横向激光模式的改进结果。对MBI抑制的影响以多个下游测量为特征，包括纵向相空间分析和相干辐射光谱学。我们还将讨论LG_ {01}整形在软X射线自种子FEL发射中的作用，这是FEL的最先进的操作模式之一，对此，MBI的受控抑制至关重要。

更新日期：2020-03-30

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