Twisted radiation from nonlinear Thomson scattering with arbitrary incident angle Ke Liu, Tongpu Yu, Debin Zou, Xinrong Xu, Yan Yin and Fuqiu Shao Eur. Phys. J. D, 74 1 (2020) 7 Published online: 22 January 2020 DOI: 10.1140/epjd/e2019-100437-4