Speaker
Description
The Shanghai High Repetition Rate XFEL (SHINE) provides an 8 GeV, 1 MHz electron beam, offering a unique high-duty-cycle driver for generating muons—ideal for certain types of muon experiments, such as muon spin rotation techniques and muon lifetime measurements. We proposed an alternative approach to muon production using high-repetition-rate (kHz-MHz) electron beams generated by superconducting linacs at the SHINE facility. Our simulations for the target optimization and design of a surface muon beamline demonstrated the potential of electron-driven muon sources to complement muon-based fundamental and applied physics research while extending the capabilities of current and future XFEL facilities. However, transitioning to experiment presents challenges, including low per-bunch yield, high background, and the need for new measurement methods. Our 2026 beam test strategy uses a compact vacuum chamber to produce and implant muons into a stopping target. Positrons from muon decay will be detected via scintillator detectors, with decay time spectra used to extract yield and lifetime; a Helmholtz coil enables future spin studies. Progress includes finalizing the chamber and coil mechanical designs, validating a prototype DAQ via cosmic muon lifetime measurements, and ongoing simulation-based optimization of target geometry to maximize yield and reduce background.
Funding Agency
The Participation in Research Program of Shanghai Jiao Tong University,
The Shanghai Pilot Program for Basic Research,
K. C. Wong Educational Foundation
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