Speaker
Description
Perhaps one of the most crucial diagnostic targets in the operation of accelerator facilities is the phase space density (PSD) of the accelerated particle bunches. The knowledge of the PSD not only governs the emission spectrum of the bunches, but it also determines other fundamental properties such as bunch length, energy spread, and more sophisticated, intra-bunch interactions. Importantly, under ideal circumstances, the state of the PSD during a specific point in time completely determines the evolution of the PSD. In this talk, we introduce a non-destructive tomographic method for determining the PSD in a storage ring. Our approach utilizes electro-optic spectral decoding measurements of bunch profiles at MHz repetition rates. As an application, we demonstrate that the PSD microstructuring as well as the PSD evolution can be observed in detail during the micro-bunching instability. Our method may enhance the control of short electron bunches in circular accelerators, and potentially offer a new avenue for studying the physics of equilibrium and non-equilibrium ultrarelativistic thermodynamic systems.
