Speaker
Description
The PERLE (Powerful Energy Recovery Linac for Experiments) project requires an injector which is capable of delivering a high-current, high-bunch-charge electron beam. Therefore, a key challenge is controlling the effects of space charge forces and the subsequent formation of halo. Beam dynamics simulations of the PERLE injector predict the onset of transverse halo due to a strong space charge effect at low energy, but experimental validation of these effects remains limited. In this work, we present an experimental study aimed at benchmarking and supporting PERLE injector halo studies using measured data from the compact Energy Recovery Linac (cERL) at KEK as a representative low-energy ERL testbed. Measurements were performed at beam energies around 3 MeV and bunch charges up to 100 pC. Transverse beam profiles were recorded at several screens downstream of the booster and through the dispersive merger section. High dynamic range imaging techniques are used to characterise the halo and study its sensitivity to injector tuning. We support these experimental results with simulations of both the cERL and PERLE injectors under scaled space-charge conditions. The combined experimental and numerical study provides insight into the halo formation mechanisms at high-charge. The results here support the development of the PERLE injector optimisation and halo mitigation strategies.
Funding Agency
Supported by ASTeC/STFC (ST/X000540/1), ANR France 2030 (ANR-24-RRII-0001), EU Horizon Staff Exchange programme EAJADE (101086276), and the France–Japan TYL-FJPPL programme.
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