The Taiwan Photon Source (TPS) storage ring employs a traditional four-kicker bump off-axis injection scheme, which can introduce perturbations to the stored beam during the injection phase. To address these issues and facilitate stable top-up injection, a Nonlinear In-vacuum Kicker (NIK) has been developed. This innovative device is specifically designed to produce zero magnetic fields in both the horizontal (Bx) and vertical (By) directions at the beam center, while generating a peak By field at the injection point. This field configuration ensures a transparent injection process by minimizing interference with the stored beam during injection. To accurately assess and refine the magnetic field properties of the NIK while avoiding arcing during measurements in atmospheric condition, a specialized in-vacuum magnetic field measurement system has been developed and deployed. This system enables precise mapping of the magnetic field profile over a range of excitation currents. This paper details the system’s mechanical design, fabrication methodology, and presents preliminary results from its implementation.

Integrating permanent magnets as substitutes for large electromagnets offers advantages such as energy savings, space efficiency, and low maintenance. An electromagnetic dipole magnet on the TPS transfer line is proposed to be replaced by a permanent magnet. This permanent magnet will be hybridized with an electrical coil to allow fine tuning of the magnetic field. Additionally, an NMR system is integrated into the magnet to monitor long-term field variations. The magnetic circuit design for the 1m-long permanent magnet has been preliminarily completed. Currently, the prototype-1 magnet with 0.15 m employs adhesive technology to bond small magnetic blocks into larger ones. The magnetic field strength and uniformity of prototype-1 meet the design specifications. NiFe material has also been used for temperature compensation. During the development process, some assembly procedures and mechanical designs were revised. The prototype-2 is currently in production. This paper presents the magnetic circuit design, the mechanism design, the magnet prototype and the field measurement result of the permanent dipole magnet.