Abstract
The possibility to predict, characterize and minimize the presence of spurious harmonic content in the longitudinal profile of high brightness electron beams, namely the microbunching instability, has become vital to ensure accurate modeling and reliable operation of radiofrequency and plasma-based linear accelerators such as those driving free-electron lasers. Recently, the impact of intrabeam scattering (IBS) on the instability has been experimentally demonstrated by the authors. This work complements that experimental study by extending existing theories in a self-consistent, piece-wise calculation of IBS in single pass linacs and multi-bend transfer lines. New expressions for the IBS are introduced in two different semi-analytical models of microbunching. The accuracy of the proposed models and the range of beam parameters to which they apply is discussed. The overall modeling turns out to be a fast comprehensive tool for the optimization of linac-driven free-electron lasers.
Highlights
The possibility to predict, characterize and minimize the presence of spurious harmonic content in the longitudinal profile of high brightness electron beams, namely the microbunching instability, has become vital to ensure accurate modeling and reliable operation of radiofrequency and plasmabased linear accelerators such as those driving free-electron lasers
Is a broadband shot-noise-like spectral distribution. This is amplified by longitudinal space charge (LSC) along accelerating sections and coherent sinchrotron radiation (CSR) in dispersive regions
In a previous work[30], we demonstrated experimentally the need of inclusion of intrabeam scattering (IBS) to correctly understand the development of microbunching instability (MBI), especially at high gain values
Summary
The possibility to predict, characterize and minimize the presence of spurious harmonic content in the longitudinal profile of high brightness electron beams, namely the microbunching instability, has become vital to ensure accurate modeling and reliable operation of radiofrequency and plasmabased linear accelerators such as those driving free-electron lasers. Electron beams have become crucial for several operations, ranging from X-ray free-electron lasers[1,2,3,4] (FELs) and plasma accelerators[5,6,7] to coherent electron cooling[8] and generation of high power THz broadband radiation[9]. The large amplitude μm-scale modulations in the final electron beam longitudinal phase space translate into large slice energy spread[15], causing the reduction of photon brilliance. This is amplified by longitudinal space charge (LSC) along accelerating sections and coherent sinchrotron radiation (CSR) in dispersive regions. The effect of LSC and CSR on the formation of microbunches results in an integral equation with specific initial c ondition[23]:
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