Speaker
Description
For next generation storage rings and free electron lasers, which demand ultra low emittance and exceptional beam stability, precise and fast transverse beam size monitoring has become increasingly critical. Conventional imaging based methods are often limited by camera frame rates and photon flux, making it difficult to achieve bunch by bunch resolution under low photon conditions. To address this challenge, we have developed a novel measurement system that combines a spatial interferometer with a high speed photomultiplier tube (PMT). The interferometric setup converts spatial coherence information into temporal signals, while the PMT provides sub nanosecond response, enabling turn by turn and even bunch by bunch beam profile acquisition. Through dedicated beam experiments and advanced algorithmic optimization, we simultaneously improve both the data refresh rate and spatial resolution. The system has been tested on a synchrotron light source, demonstrating real time capture of fast beam size variations that are inaccessible with conventional cameras. This approach not only meets the stringent requirements for online monitoring and fast feedback in modern accelerator facilities, but also lays a solid foundation for developing active beam size control techniques. The results show that the proposed method operates reliably at low photon counts, offering a promising pathway toward high speed, high precision beam diagnostics for future light sources.
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