| Title | Longitudinal phase space improvement of a continuous-wave photoinjector toward X-ray free-electron laser application |
| Authors | Zhao, Sheng Huang, Senlin Lin, Lin Liu, Yunqi Jia, Haoyan Qin, Weilun Quan, Shengwen Liu, Kexin |
| Affiliation | Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China Peking Univ, Sch Phys, Inst Heavy Ion Phys, Beijing 100871, Peoples R China Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22603 Hamburg, Germany |
| Keywords | OPERATION CW |
| Issue Date | 1-Dec-2021 |
| Publisher | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT |
| Abstract | The electron source still remains a major challenge for continuous-wave (CW) X-ray free-electron lasers (FELs). In this paper, we study the feasibility of an injection line based on a DC and superconducting radio-frequency (SRF) combined photocathode injector. We present a detailed investigation on the longitudinal phase space evolution of the electron beam along the injection line. We also analyze the main issues determining the high-order energy spread and current skewness. Based on the analysis, we propose to use a harmonic cavity as the buncher for the injection line. Simulation shows that an extracted electron beam with a normalized RMS emittance of 0.37 mu m, an RMS bunch length of 1.0 mm, a high-order RMS energy spread of 2.75 keV, and a current skewness of 0 can be obtained at the bunch charge of 100 pC. This study is meaningful to the design of the injection lines for short-wavelength CW FELs, including those based on normal-conducting very-high-frequency (VHF) guns or DC guns. |
| URI | http://hdl.handle.net/20.500.11897/626809 |
| ISSN | 0168-9002 |
| DOI | 10.1016/j.nima.2021.165796 |
| Indexed | EI SCI(E) |
| Appears in Collections: | 物理学院 核物理与核技术国家重点实验室 |
