Status of Various Types of Undulators at SXFEL

Starting in the autumn of 2022, the Shanghai soft X-ray Free-Electron Laser User facility (SXFEL-UF) is open for users. SXFEL-UF has two undulator lines: a SASE line and a Seeding line, which generate FEL radiation with the shortest wavelength of about 2 nm and 3 nm, respectively. A total of 31 undulators of diverse types have been installed, including eighteen hybrid permanent magnet undulators (PMU), ten hybrid in-vacuum undulators (IVU), two APPLE II elliptically polarized undulators (EPU), and an electromagnet wiggler (EMW). An Apple III EPU is under development and scheduled for installation in the spring of 2024. This paper presents an overview of various types of undulators at SXFEL, encompassing their main parameters, design, and magnetic field performance.