Speaker
Description
High brightness and low transverse emittance are essential for achieving high signal-to-noise ultrafast electron diffraction (UED). In practice, however, asymmetries in the RF gun cavity and misalignments of the focusing solenoid introduce residual stray quadrupole fields, leading to transverse phase-space coupling that degrades beam quality and limits UED performance.Here we use a compact correction scheme based on a combination of normal and skew quadrupoles, enabling the synthesis of a compensating quadrupole field with tunable strength and rotation to systematically suppress multi-source stray fields. Guided by the HUST-UED parameters, we design and implement a dedicated corrector and perform four-dimensional transverse phase-space measurements. The results show effective decoupling of the horizontal and vertical phase spaces and a marked reduction of coupling-induced aberrations.Following the correction, the beam brightness is significantly enhanced, demonstrating the effectiveness and practicality of the approach for high-brightness electron sources. This work paves the way for higher signal-to-noise and improved spatiotemporal resolution in ultrafast diffraction imaging.
Funding Agency
This work is supported by the National Natural Science Foundation of China under project No.12235005, No. 12275094. National Key Research and Development Program of China (2024YFB4607900, 2022YFA16022
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