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Description
The multipurpose synchrotron radiation accelerator (4GSR), currently under development at the pohang accelerator laboratory (PAL), offers exceptional performance with 100 times higher brilliance and an ultralow emittance of 58 pm·rad compared to third-generation synchrotron light sources. The storage ring includes 344 quadrupoles, 168 sextupoles, and 56 octupoles, most of which are designed with small half-apertures ranging from 15 to 20 mm. This paper presents the development of a rotating coil system designed to precisely measure the magnetic fields of these multipole magnets. The system employs PCB coils with a width of 12 mm as sensors, with a total coil length of 550 mm to accommodate the effective length (354 mm) of the longest quadrupole (Q51) in 4GSR. To enhance signal strength, the PCB coil was constructed with 8 layers and 64 turns. The measured signals are processed using an 18-bit high-precision integrator. The driving system consists of a step motor and an encoder with a resolution of 10,000 pulses/rev. To minimize noise in the measurement signals, a mercury slip ring with a contact resistance of less than 1 mΩ was employed.
| Region represented | Asia |
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