Abstract
Novel traveling-wave rf gun for compact high-brightness photoinjectors is designed by joint optimization of beam dynamics and 3D rf calculations.
Highlights
The electron beam quality in free electron laser (FEL) machines is mainly determined during the initial acceleration, before space-charge effects are suppressed by relativistic effects
A closer look to the required input power for the nominal gradient of 135 MV=m reveals that the structure with 120 deg phase advance per cell can be directly fed with a standard klystron amplifier as that employed in the main linac of SwissFEL, which can provide a maximum of 40 MW at the gun input (50 MW at the klystron output minus 20% losses in the waveguide system)
Radio-frequency traveling-wave photocathode guns have the potential to provide more rigid electron beams with higher brightness. The design of such a traveling-wave gun operating at C-band was developed and first optimized based on the beam dynamics performance
Summary
The electron beam quality in free electron laser (FEL) machines is mainly determined during the initial acceleration, before space-charge effects are suppressed by relativistic effects. Due to the topology of the rf input coupling lying at the center of the device between the standing-wave and the traveling-wave part, they require a complex system of multiple focusing solenoids (and bucking coil) to provide a suitable focusing Such hybrid photocathode guns were proposed for applications with completely different parameters than FEL photoinjectors [18]. The length of input, regular and output cells of the traveling-wave gun are optimized by stretching the gun field map based on the beam dynamics performance and are adopted in the rf design The cylindrical symmetry characterizing the gun in the beam region strongly simplifies its manufacturing and avoids additional emittance contributions
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