Abstract
Beam-driven plasma-wakefield acceleration based on external injection has the potential to significantly reduce the size of future accelerators. Stability and quality of the acceleration process substantially depends on the incoming bunch parameters. Precise control of the current profile is essential for optimising energy-transfer efficiency and preserving energy spread. At the FLASHForward facility, driver-witness bunch pairs of adjustable bunch length and separation are generated by a set of collimators in a dispersive section, which enables fs-level control of the longitudinal bunch profile. The design of the collimator apparatus and its commissioning is presented.
Highlights
High acceleration gradients inherent in a plasma wakefield make it a compelling technique for compact particle accelerators [1, 2, 3], potentially reducing costs of future free-electron lasers (FELs) or colliders [4, 5, 6]
At the FLASHForward facility, driver–witness bunch pairs of adjustable bunch length and separation are generated by a set of collimators in a dispersive section, which enables fs-level control of the longitudinal bunch profile
The resulting energy spread of the accelerated bunch is determined by the wakefield structure, which changes with the current profiles of the driver and witness bunches
Summary
High acceleration gradients inherent in a plasma wakefield make it a compelling technique for compact particle accelerators [1, 2, 3], potentially reducing costs of future free-electron lasers (FELs) or colliders [4, 5, 6]. At the FLASHForward facility, driver–witness bunch pairs of adjustable bunch length and separation are generated by a set of collimators in a dispersive section, which enables fs-level control of the longitudinal bunch profile. The milestone of external-injection PWFA is high-efficiency acceleration while preserving the beam quality, including emittance and energy spread. The resulting energy spread of the accelerated bunch is determined by the wakefield structure, which changes with the current profiles of the driver and witness bunches.
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