Speaker
Description
In order to achieve the magnetic field measurement work for the 50MeV proton cyclotron irradiation device, a fully automatic magnetic field measurement device based on the Hall effect method is designed, using non-magnetic materials G10 and PEEK with high strength and wear resistance, optimizing the gear ratio, reducing the weight of the device, and adjusting the magnetic field measurement process to shorten the measurement cycle. The installation accuracy of the magnetic field measurement device reaches ±0.03mm, and the installation accuracy of the shims after adjustment is as high as ±0.02mm. By using a specific shim positioning tool, the shim adjustment accuracy reaches ±0.02mm. Ultimately, through the use of this new magnetic field measurement device, five magnetic field measurements and four high-precision shimming operations have been carried out, successfully completing the magnetic field measurement work of the 50MeV proton cyclotron and achieving good results. The isochronism goal of integral slip phase not exceeding ±10° was achieved, meeting the physical design requirements of the 50MeV proton cyclotron. From the facility commissioning to the customer's experiment, it only took 15 days. During the 12-hour performance test, all systems operated stably without errors, demonstrating the excellent magnetic field performance of the accelerator and proving the importance and accuracy of the magnetic field measurement device and shimming.
