Multicolor High-Gain Free-Electron Laser Driven by Seeded Microbunching Instability

被引：45

作者：

Roussel, E. ^{[1
]}

Ferrari, E. ^{[1
,2
]}

Allaria, E. ^{[1
]}

Penco, G. ^{[1
]}

Di Mitri, S. ^{[1
]}

Veronese, M. ^{[1
]}

Danailov, M. ^{[1
]}

Gauthier, D. ^{[1
]}

Giannessi, L. ^{[1
,3
]}

机构：

[1] Elettra Sincrotrone Trieste, I-34149 Trieste, Italy

[2] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[3] ENEA Frascati, I-00044 Frascati, Italy

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 21期

关键词：

X-RAY; EXTREME-ULTRAVIOLET; GENERATION; RADIATION; PULSES; OPERATION; COHERENT; SPACE; BEAM;

D O I：

10.1103/PhysRevLett.115.214801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Laser-heater systems are essential tools to control and optimize high-gain free-electron lasers (FELs) working in the x-ray wavelength range. Indeed, these systems induce a controllable increase of the energy spread of the electron bunch. The heating suppresses longitudinal microbunching instability which otherwise would limit the FEL performance. Here, we demonstrate that, through the action of the microbunching instability, a long-wavelength modulation of the electron beam induced by the laser heater at low energy can persist until the beam entrance into the undulators. This coherent longitudinal modulation is exploited to control the FEL spectral properties, in particular, multicolor extreme-ultraviolet FEL pulses can be generated through a frequency mixing of the modulations produced by the laser heater and the seed laser in the electron beam. We present an experimental demonstration of this novel configuration carried out at the FERMI FEL.

引用

页数：5

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