Speaker
Description
Acceleration of cooled muons is a promising technology for realizing a low-emittance muon beam, which is essential for novel muon science such as precise measurement of the muon dipole moments. This technology is being developed at the Materials and Life Science Experimental Facility (MLF) at J-PARC, where muons are cooled to thermal energies through muonium formation followed by laser ionization. The resulting cooled muon beam, known as the ultraslow muon beam, is then accelerated by a linear accelerator (linac) complex.
Following the world's first demonstration of a low-emittance accelerated positive muon beam at 100 keV in 2024, this year we achieved further acceleration to 0.34 MeV using a radio-frequency cavity, the first stage of the linac. Downstream cavities are under design or fabrication to reach 4.3 MeV by 2028 and a few hundred MeV in the 2030s, while an upgrade of the ultraslow muon source is underway to achieve an intensity of 10^5 muons per second. In parallel, development of various subsystems for the muon dipole moments measurement is also progressing. In this contribution, we will present the status and prospects of muon acceleration and muon dipole moments measurement.