Design Considerations of a Magnet-Based Diagnosis System With Compact Layout for Typical Beam Injector

The beam diagnosis system, used to assess beam quality, plays a crucial role in the overall commissioning and operation of accelerator-based injectors. Among various diagnostic methods, magnet-based approaches stand out due to their simplicity and ease of implementation, notably the dipole (D) magnet-based energy analysis system and the quadrupole (Q) magnet-based emittance measurement system. To cater to the specific needs of typical injectors operating within the energy range of 3∼15 MeV, a universal beam diagnosis platform based on magnets is planned for development. This platform will facilitate the measurement of fundamental beam parameters such as energy, energy spread, emittance, current, and transverse size. Thus, in addition to Q and D magnets, the transport line will also incorporate essential insertion components such as Fluorscreen and a fast current transformer. In this context, the physical design of the magnet-based diagnosis system has been conducted, and comprehensive investigations have been performed to evaluate the impacts of engineering factors, such as fringe fields and magnetic field instability, on measurement accuracy. The system's compatibility and potential for future upgrades have also been considered in the design process.