Superradiant THz undulator radiation source based on a superconducting photo-injector.Nuclear Instruments and Methods in Physics Research A,820,75–79,2016,10.1016/j.nima.2016.03.003 Drive laser system for the DC-SRF photoinjector at Peking University Ultrafast electron diffraction with megahertz MeV electron pulses from a superconducting radio-frequency photoinjector Widely tunable two-color free-electron laser on a storage ring CHEN Jia-Er, Beam breakup simulation study for high energy ERL Generation of stable subfemtosecond hard x-ray pulses with optimized nonlinear bunch compression Relative spectral response measurement of spectrometers using undulator radiation Zhu, Coherent wiggler radiation of picosecond CW electron beam produced by DC-SRF photoinjector CHEN Jia-Er, Multi-pass, multi-bunch beam breakup for 9-cell Tesla cavities in the ERL An emittance measurement device for a space-charge dominated electron beam