Speaker
Description
A cryogen-free, conduction-cooled high-temperature-superconducting (HTS) wavelength shifter (WLS) has been developed collaboratively by the Pohang Accelerator Laboratory (PAL) and Seoul National University (SNU) as part of the HTS insertion-device (ID) roadmap for future light sources in Korea. The device employs multi-width REBCO conductors with no-insulation (NI) technology to achieve high current density and quench-free operation near 20 K. The magnet core, cryostat, and vacuum chamber were fully assembled and successfully cooled using a pulse-tube cryocooler without liquid helium. A central magnetic field of 5.02 T was achieved and stably maintained, confirming the feasibility of LHe-free operation. Following iterative improvements to electrical and thermal insulation, the system demonstrated long-term stability and sufficient temperature margin under conduction cooling. The next phase involves detailed field-mapping under cryogenic and vacuum conditions to determine operational current pairs, followed by beam-based characterization in the storage-ring environment. The results represent a significant step toward realizing compact, low-maintenance HTS insertion devices for next-generation synchrotron radiation facilities.
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