Abstract
We present the experimental investigation of a collective effect driving strong modulation in the longitudinal phase space of a high-brightness electron beam. The measured beam energy spectrum was analyzed in order to reveal the main parameters of modulation. The experimental results were compared with a model of space-charge oscillations in the beam longitudinal phase space. The measurements and analysis allowed us to determine the range of the parameters of the observed effect on the modulation dynamics and illustrate its potential impact on short-wavelength free electron laser performance.
Highlights
During the past decade a growing demand for a new generation of light sources has initiated research and development on high-gain free-electron lasers (FEL) [1]
This paper describes the experimental characterization of a space-charge induced modulation in the longitudinal phase space of a high-brightness electron bunch
The structure in the measured energy spectra was interpreted as a projection of the modulated longitudinal phase space
Summary
During the past decade a growing demand for a new generation of light sources has initiated research and development on high-gain free-electron lasers (FEL) [1]. New light sources are required, having unprecedented brightness along with flexible temporal properties of radiation in the extreme ultraviolet to x-ray wavelength range [2 –5] These requirements place serious constraints on the allowable quality of the ‘‘active medium’’ in accelerators-FEL drivers. Longitudinal space charge and linac wakefield can drive the microbunching instability [10 –12] These effects may be very large for short-wavelength FELs when multistage bunch compression is incorporated. Small density clusters in the electron bunch create longitudinal space-charge field that accelerates particles at the head of the cluster and decelerates particles at the tail. The longitudinal phase-space distribution of the electron bunch at the end of the accelerator is strongly distorted This effect is emphasized in the high-peak current regime required for achieving high gain in a singlepass FEL. IV we summarize the results of this work and discuss their significance on future x-ray FELs
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