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Description
The bulk high-temperature superconducting (HTS) undulator constructed from RE-Ba-Cu-O (REBCO) bulks demonstrates the capability to generate an undulator field up to 2.1 T of 10 mm period [1]. This performance exceeds that of the current state-of-the-art permanent magnet and low-temperature superconducting undulators [2]. Compared to REBCO bulks, the alternative MgB2 bulk superconductors exhibit a relatively lower critical current density, Jc but possess superior mechanical properties and machinability. Moreover, the field-trapping capability of individual MgB2 bulks shows reduced variability, which is advantageous for minimizing peak-to-peak undulator field errors. This study presents a numerical and experimental investigation of a short HTS undulator constructed using a staggered-array configuration of MgB2 bulk superconductors with enhanced critical current density. The highly dense MgB2 bulks were fabricated at CRISMAT using the unconventional Spark Plasma Sintering technique [3]. To improve the on-axis magnetic field performance, the MgB2 undualtor was designed with a period length of 15 mm and a magnetic gap of 4 mm. This study provides a detailed summary of the sample preparation processes conducted at Zhangjiang Laboratory, the experimental setup at the University of Cambridge and PSI and the associated test results.
Key words: HTS undulator, MgB2 bulk, Numerical Simulation.
REFERENCES
[1] Kai Zhang et al., “Record field in a 10 mm-period bulk high-temperature superconducting undulator,” Supercond. Sci. Technol., vol. 36, 05LT01, 2023
[2] Dabin. Wei, et al., “Electromagnetic Design Study of a 12-mm-Period Bulk High-Temperature Superconducting Undulator," IEEE Trans. on Appl. Supercond., vol. 34, no. 5, pp. 1-5, Aug. 2024, Art no. 4100705.
[3] Xing, Yiteng, et al. "High critical current density of nanostructured MgB2 bulk superconductor densified by spark plasma sintering." Nanomaterials 12.15 (2022): 2583.
