Speaker
Description
For the reduction of beam emittance in a Korea-4GSR project, the storage ring will be equipped with 344 quadrupole, 168 sextupole, and 56 octupole magnets. These multipole magnets require precise magnetic measurements to verify not only the field strength but also harmonic components within the specified tolerances over a good field region with a diameter of 30 mm. To meet this requirement, a PCB-based rotating coil measurement system has been developed. The PCB consists of a 14-layer multilayer structure incorporating both main and bucking coils, enabling high-precision measurement of allowed and higher-order harmonic components. The PCB length was designed to be 660 mm, considering to the effective magnetic length of the 4GSR multipole magnets. To minimize mechanical sag, the rotating shaft was fabricated from ceramic material and positioned at the magnetic field center using a high-precision XY stage with 0.1 μm resolution. The developed rotating coil system achieves a measurement precision better than 5 × 10-4, demonstrating its suitability for high-accuracy characterization of small-aperture multipole magnets in the 4GSR project.
| Paper status | Proceeding files received |
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