Fig. 1. The schematic of dimuon production and diagnostics. Muons were produced through Bethe–Heitler pair production process by photons generated from bremsstrahlung of laser wakefield accelerated electrons in high Z material (muon target). The produced muons flied along the direction of electron beam into the water to loss energy and stop in the scintillator detector. Lead was used to reduce the radiation background.

Fig. 2. (a) The ‘successful catch’ muon events as a function of the primary muon energy at different water lengths and (b) detection efficiencies obtained by simulation.

Fig. 3. The deposited energy of electrons decayed from ‘successful catch’ muons as a function of time. The linear background shows radiation contamination from 50,000 photons entering the detection system with a flat energy distribution from 200 to 1000 MeV.