- Press Release
Muon Acceleration: From Demonstration to Implementation－Cooled muons accelerated to 0.3 MeV in the new dedicated experimental area
September 2nd, 2026
A research group including Professor Tsutomu Mibe of the Institute of Particle and Nuclear Studies (IPNS) conducted a muon cooling and radio-frequency acceleration experiment in the Muon H2 Area, newly constructed at the Materials and Life Science Experimental Facility (MLF) of J-PARC. As a result, the cooled muons were successfully accelerated to a kinetic energy of 0.3 MeV (approximately 8% of the speed of light).
Compared with the world’s first demonstration of muon cooling and acceleration in 2024, the group achieved three times the energy and 200 times the intensity. The group also successfully carried out the entire process from muon cooling to acceleration in the H2 Area, where experiments such as the muon g-2/EDM experiment will be performed. This achievement marks a significant advance from the “demonstration” stage of muon acceleration to the “implementation” stage of producing beams for actual experiments, and represents an important step toward the operation of the world’s only muon accelerator.
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Conceptual diagram of positive muon cooling and acceleration. Cooling the positive muons, whose directions and velocities are initially spread out, enabled efficient radio-frequency acceleration.
▼For more details, please see the J-PARC press release.
https://www.j-parc.jp/c/en/press-release/2026/08/31001875.html
