Average and statistical properties of coherent radiation from steady-state microbunching

A promising accelerator light source mechanism called steady-state microbunching (SSMB) is being actively studied. With the combination of strong coherent radiation from microbunching and high repetition rate of a storage ring, high-average-power narrow-band radiation can be anticipated from an SSMB storage ring, with wavelengths ranging from THz to soft X-ray. Such a novel light source could provide new opportunities for accelerator photon science like high-resolution angle-resolved photoemission spectroscopy and industrial applications like extreme ultraviolet (EUV) lithography. In this paper, a theoretical and numerical study of the average and statistical properties of coherent radiation from SSMB are presented. The results show that 1   kW average-power quasi-continuous-wave EUV radiation can be obtained from an SSMB ring provided that an average current of 1   A and a microbunch train with bunch length of 3   nm can be formed at the radiator which is assumed to be an undulator. Together with the narrow-band feature, the EUV photon flux can reach 6   ×   1015   photons   s − 1 within a 0.1   meV energy bandwidth, which is three orders of magnitude higher than that in a conventional synchrotron source and is appealing for fundamental condensed matter physics and other research. In this theoretical investigation, we have generalized the definition and derivation of the transverse form factor of an electron beam which can quantify the impact of its transv...

Source: Journal of Synchrotron Radiation - November 16, 2022 Category: Physics Authors: Deng, X.J. Zhang, Y. Pan, Z.L. Li, Z.Z. Bian, J.H. Tsai, C.-Y. Li, R.K. Chao, A.W. Huang, W.H. Tang, C.X. Tags: accelerator light source steady-state microbunching transverse form factor radiation fluctuation EUV lithography ARPES coherent radiation research papers Source Type: research