Design and implementation of a parallel linkage mechanism with spring assembly for magnetic force compensation in insertion devices

This study presents the design and fabrication of a me-chanical compensation system aimed at neutralizing the magnetic attraction forces inherent in insertion devices (IDs) used in synchrotron radiation facilities. In long IDs, such as those measuring 4 meters in length, multiple compensation modules—typically four—are required to maintain structural stability and magnetic field uniformi-ty. In this work, a single compensation module was de-signed, fabricated, and installed on a test platform to verify the feasibility and mechanical performance of the proposed mechanism. The system integrates a parallel linkage mechanism with a spring assembly consisting of twelve coil springs. The parallel linkage ensures synchronized and stable movement of the magnetic arrays with minimal structural deformation, while the spring assembly provides a counteracting force that balances the increasing magnetic attraction as the ID gap narrows. Although the mechanism was not installed on a working ID, test results demonstrate its effectiveness in reducing structural load and maintaining precise displacement control under simulated magnetic force conditions. This confirms the concept's viability and its potential for improving operational efficiency and safety in future ID applications.