LINAC2026 - 33rd Linear Accelerator Conference

Low-emittance muon beam acceleration using a radio frequency quadrupole for the J-PARC muon g−2/EDM Experiment

Not scheduled

20m

Daejeon Convention Center

Invited Talk (Invitation Only) MC1.A03 Other beams Invited Talks

Speaker

Yuga Nakazawa (High Energy Accelerator Research Organization)

Description

At Japan Proton Accelerator Research Complex (J-PARC), a low-emittance muon beam based on a linear accelerator is being developed for precision measurements of the muon anomalous magnetic moment (g-2) and electric dipole moment (EDM), as well as for non-destructive imaging applications. In the low-velocity section of the muon linac, a 324-MHz radio-frequency quadrupole linac (RFQ) is employed to bunch and accelerate muons from thermal energy to 340 keV.
In this study, a muon-beam cooling and RFQ acceleration experiment is being conducted at J-PARC. Thermal muons are produced via laser ionization of thermal muonium emitted from a room-temperature silica aerogel target, electrostatically extracted to 5.7 keV, and injected into the RFQ. The muons are accelerated to 340 keV, and their longitudinal and transverse beam profiles are being characterized at the RFQ exit.
This work demonstrates an in-situ implementation of a full-scale RFQ for the world’s first muon linac in the dedicated g−2/EDM experimental area at J-PARC. The experimental concept, beamline configuration, commissioning status, and outlook toward establishing a low-emittance muon linac are presented.