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SLAC Publication: SLAC-PUB-17518
SLAC Release Date: February 28, 2020
Laguerre-Gaussian mode laser heater for microbunching instability suppression in free-electron lasers
Carbajo, Sergio.
Microbunching instability (MBI) driven by beam collective eects 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 (LH). The distribution of the induced energy spread greatly aects MBI suppression and can be controlled by shaping the transverse prole of the heater laser. Here, we present the rst experimen-tal demonstratio... Show Full Abstract
Microbunching instability (MBI) driven by beam collective eects 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 (LH). The distribution of the induced energy spread greatly aects MBI suppression and can be controlled by shaping the transverse prole of the heater laser. Here, we present the rst experimen-tal demonstration of eective MBI suppression using a LG01 transverse laser mode and compare the improved results with respect to traditional Gaussian transverse laser mode at LCLS. The eects on MBI suppression are characterized by multiple downstream measurements, including longitudinal phase space analysis and coherent radiation spectroscopy. We also discuss the role of LG01 shaping in soft X-ray self-seeded (SXRSS) FEL emission, one of the most advanced operation modes of a FEL for which controlled suppression of MBI is critical. Show Partial Abstract
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  • Interest Categories: Accelerator Physics, Accelerator (control systems), Instrumentation/Development, Optics, X-Ray Free Electron Laser