Speaker
Description
A 50-period, helium-free high-temperature superconducting undulator (HTSU12) has been under development at Zhangjiang Laboratory (ZJLAB) since 2023 for potential deployment at the Shanghai Soft X-ray Free-Electron Laser facility. This prototype device is conduction-cooled using GM cryocoolers and has recently demonstrated an on-axis peak field of ~1.8 T at a period length of 12 mm and a magnetic gap of 4.5 mm (corresponding to a clear mechanical aperture of 4.3 mm). The primary components of the device include a superconducting solenoid that provides the background magnetization field, a cryostat housing a long high-temperature superconducting insert composed of a staggered array of REBCO bulk superconductors, and a high-precision temperature control system. To evaluate the magnetic field quality of HTSU12, we developed an in-vacuum magnetic field measurement system. In this presentation, we report the design, fabrication, cryogenic testing, magnetic field characterization, and subsequent field correction of HTSU12 at ZJLAB. The experimental results collectively highlight the technical achievements and challenges of high-temperature superconducting undulator for integration into next-generation free-electron laser facilities.
Funding Agency
This work is supported by National Overseas Young Talent Program.
| Paper status | No proceeding expected for this contribution. |
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