Abstract
Longitudinal phase space manipulation is a critical and necessary component for advanced acceleration concepts, radiation sources and improving performances of X-ray free electron lasers. Here we present a simple and versatile method to semi-arbitrarily shape the longitudinal phase space of a charged bunch by using wakefields generated in tailored dielectric-lined waveguides. We apply the concept in simulation and provide examples for radiation generation and bunch compression. We finally discuss the manufacturing capabilities of a modern 3D printer and investigate how printing limitations, as well as the shape of the input LPS affect the performance of the device.
Highlights
Emerging advanced accelerator concepts require precise control over the longitudinal phase space (LPS) of charged particle beams
For a fixed longitudinal phase space shaper (LPSS) geometry, the sensitivity of the linearity parameter R within a 4σ region of interest (ROI) is determined for four different parameters, with the first two parameters being the amplitude and phase of the accelerating field, which define the curvature of the incoming LPS
The results show that the relative change in R is very little (≪ 0.1%), leading to the conclusion that, in the specific case of the example of LPS linearization, the LPSS scheme is robust within the limits of typical accelerator machine stability
Summary
Emerging advanced accelerator concepts require precise control over the longitudinal phase space (LPS) of charged particle beams. Efficient beam-driven acceleration, for example, relies on longitudinally tailored electron bunch profiles which may be produced with an appropriate energy modulation and dispersive section [1,2,3,4] or other means [5,6,7,8]. Arbitrary laser-based phase space control was discussed in [20], illustrating the potential for producing different current profiles for various applications. By using segmented waveguides with varying cross sections, the excited wakefields carry different spectral contents throughout the structure, enabling control over the energy modulation across the bunch. Due to the nature of the physical process, the scheme is completely passive, removing the need for synchronization with e.g., a modulating laser beam or rf field This is, for example, taken advantage of in [21], where the authors use a leading drive bunch to excite the wakefields.
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