Prompt acceleration of the $μ^+$ beam in a donut wakefield driven by a shaped Laguerre-Gaussian laser pulse

The recent experimental data of anomalous magnetic moments strongly indicate the existence of new physics beyond the standard model. An energetic $μ^+$ beam is a potential option to the expected neutrino factories, the future muon colliders and the $μ$SR(the spin rotation, resonance and relaxation) technology. It is proposed a prompt acceleration scheme of the $μ^+$ beam in a donut wakefield driven by a shaped Laguerre-Gaussian (LG) laser pulse. The forward part of the donut wakefield can accelerate and also focus positive particle beams effectively. The LG laser is shaped by a near-critical-density plasma. The shaped LG laser has the shorter rise time and can enlarge the acceleration field. The acceleration field driven by a shaped LG laser pulse is six times higher than that driven by a normal LG laser pulse. The simulation results show that the $ μ^+$ bunch can be accelerated from $200\mathrm{MeV}$ to 2GeV and the transversal size of the $μ^+$ bunch is also focused from initial $ω_0=5μm$ to $ω=1μm$ within several picoseconds.