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Description
The Taiwan Photon Source (TPS) currently utilizes a direct-drive type septum magnet for beam injection. To reduce the impact of stray magnetic fields on the stored beam during injection, we propose a conceptual design of an eddy current type septum as a replacement. This design is expected to significantly suppress leakage fields near the stored beam, thereby minimizing orbit distortion and injection-induced perturbations.
A thin eddy-current septum prototype has been developed using laminated silicon steel sheets as the magnet core. Theoretical analyses and transient field simulations have been performed using OPERA software to evaluate magnetic behavior under pulsed excitation. Due to the thin septum structure, several optimization strategies have been applied—such as shielding with strongly paramagnetic materials and excitation with a full-cycle driving pulse—to ensure the leakage field remains below 0.1% of the main field.
This paper presents the design approach, analyzes the influence of eddy currents on field distribution, and investigates compensation methods to enhance magnetic field quality and injection performance.
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