2024/12/18 by Sergei Kladov, Kladov, Sergei, Sergei Nagaitsev +16
Engineering · Physics and Astronomy · #Particle Accelerators and Free-Electron Lasers #Dark Matter and Cosmic Phenomena #Gyrotron and Vacuum Electronics Research
paper · pdf · doi:10.48550/arxiv.2412.13482
This article investigates electron bunch density fluctuations in the 1 - 10 μm wavelength range, focusing on their impact on coherent electron cooling (CEC) in hadron storage rings. In this study, we thoroughly compare the shot-noise model with experimental observations of optical transition radiation (OTR) generated by a relativistic electron bunch (γ≈ 50), transiting an Aluminium metal surface. The bunch parameters are close to those proposed for a stage in an Electron-Ion Collider (EIC), where the bunch size is much larger than the OTR wavelength being measured. Here we present measurements and particle tracking results of both the low-level noise for the EIC bunch parameters and longitudinal space-charge-induced microbunching for the chicane-compressed bunch with coherent OTR enhancements up to 100 times in the various bandwidth-filtered near-infrared (NIR) OTR photodiode signals. We also discuss the corresponding limitations of the OTR method.