Kaijie Chen, Xiangfei Wang, Hanghua Xu, G T Fan, Zhenwei Wang, Zirui Hao, L. X. Liu, Yue Zhang, Sheng Jin, Zhicai Li, Pu Jiao, Qingping Sun, Mengdie Zhou, Y. R. Shen, Mengke Xu, Chang Yang, Jiawen Ding, Hongwei Wang, Wenqing Shen, Yugang Ma
The interaction of photons with relativistic electrons constitutes a fundamental electromagnetic process whose polarization-transfer mechanics remain incompletely characterized. We report the first systematic measurement of the spatial polarization distribution for [Formula: see text] rays generated via [Formula: see text] slant inverse Compton scattering (ICS) between linearly polarized [Formula: see text] photons and [Formula: see text] electrons, performing full two-dimensional mapping of the intensity, angle of polarization (AOP) and degree of polarization (DOP). The measurements reveal an asymmetric beam profile along the laser polarization direction that resembles observations from [Formula: see text] backward ICS. The central beam region exhibits DOP near 1.0, with the AOP rigidly aligned at [Formula: see text], while peripheral regions display complex, non-uniform polarization distributions. These findings confirm quantum electrodynamics predictions of near-complete polarization transfer along the beam axis in slant geometries, thereby establishing slant scattering as a viable alternative to head-on configurations for generating high-DOP [Formula: see text] rays.