A general laser-beam synchronization method based on coherent radiation measurement is introduced.Fundamental principles and detailed steps to achieve spatial and temporal synchronization are described.Sub-picosecond level synchronization between the seed laser and the electron beam has been achieved with this method at the Shanghai Deep-Ultraviolet Free-Electron Laser (SDUV-FEL) test facility,which lays a solid foundation for seeding experiments such as high-gain harmonic-generation (HGHG),echo-enabled harmonicgeneration (EEHG) and cascaded HGHG.Moreover,longitudinal profiles of the electron beam under different conditions are measured and analyzed.%介绍了一种基于相干辐射测量的激光-电子束同步方法,描述了实现空间及时间同步的基本原理、步骤和细节,并利用这种方法在上海深紫外自由电子激光装置(SDUV-FEL)上实现了电子束与激光之间亚ps量级的精确同步,为基于外种子激光的高增益高次谐波产生(HGHG)、回声型谐波产生(EEHG)和级联HGHG自由电子激光实验奠定了坚实的基础.还利用这种手段对不同条件下的电子束纵向特性进行了测量和分析.
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