Speaker
Description
Minimally-invasive single-shot beam diagnostics are essential for the next generation of high-brightness electron accelerators. We report on the ongoing development of an ionization-based beam profile monitor utilizing a supersonic nitrogen gas sheet target. Recent progress has focused extensively on characterizing the precise density profile of the gas target, which is critical for accurate beam profiling. By systematically sweeping an ionizing laser across the gas sheet and imaging the subsequent recombination luminescence, we have successfully resolved spatial maps of the gas density. These empirical density maps provide vital feedback on current gas jet dynamics and are actively informing the design and optimization of nozzle geometries.
In parallel with experimental nozzle characterization, we are advancing the diagnostic's electrostatic optic column using General Particle Tracer (GPT) simulations. This computational work optimizes the electrostatic column geometry and focusing profiles for both high-resolution spatial imaging and Velocity Map Imaging (VMI). Furthermore, we are modeling the "streaking" dynamics of ions born within intense fields, such as the ionizing laser pulse or the space-charge field of a driving electron beam, utilizing simulation parameters specifically matched to the operational capabilities of the PEGASUS beamline at UCLA. By simulating this momentum kick within a VMI configuration, we are establishing a framework to resolve the time of ionization of the individual gas molecules. This presentation will detail our experimental gas mapping techniques and outline the simulation framework in preparation for experiments at the PEGASUS facility.
| Working group | WG5 |
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