A high-temperature superconducting compact Shanghai–Lanzhou electron beam ion trap for precision measurement of highly charged ions

We present the design, implementation, and initial performance of the Shanghai-Lanzhou electron beam ion trap (SL-EBIT), a compact electron beam ion trap employing high-temperature superconducting magnets and optimized for high-precision optical spectroscopy of highly charged ions. The system integrates a thermionic electron gun, independently biased drift tubes, and a high-efficiency electron collector within a compact ultrahigh-vacuum configuration, enabling stable operation over a broad range of electron beam energies. The performance of the SL-EBIT is benchmarked through optical spectroscopy of well-established fine-structure transitions, including the 1s22s22pP3/22→P1/22 transition in boron-like Ar13+ and the 1s22s22p5P1/22→P3/22 transition in fluorine-like Ar9+. The measured wavelengths are in good agreement with previously reported high-precision values within the combined experimental uncertainties, validating the wavelength calibration procedure and the spectroscopic performance of the instrument. In addition, the SL-EBIT is designed to support future charge-state-resolved ion extraction and external laser spectroscopy experiments, providing a flexible and versatile platform for precision spectroscopic studies of highly charged ions.