Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers

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 d...

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Bibliographic Details
Published in:Physical review letters 2020-04, Vol.124 (13), p.134801, Article 134801
Main Authors: Tang, Jingyi, Lemons, Randy, Liu, Wei, Vetter, Sharon, Maxwell, Timothy, Decker, Franz-Josef, Lutman, Alberto, Krzywinski, Jacek, Marcus, Gabriel, Moeller, Stefan, Huang, Zhirong, Ratner, Daniel, Carbajo, Sergio
Format: Article
Language:English
Subjects:
Beam control
Beam dynamics
Beam impedance
Beam instabilities
Coherent light
Coherent radiation
Downstream effects
Electron beams
Energy distribution
Free electron lasers
Laser beams
Laser modes
Lasers
Light sources
Nonlinear beam dynamics
PARTICLE ACCELERATORS
Relativistic multiple-particle dynamics
Soft x rays
Stability
Storage rings (particle accelerators)
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.134801