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

TL;DR

This paper proposes a novel prompt acceleration scheme for muon beams using a donut wakefield driven by a shaped Laguerre-Gaussian laser pulse, achieving significant energy gain and focusing in simulations.

Contribution

It introduces a new muon acceleration method utilizing shaped LG laser pulses to generate stronger wakefields and improve beam focus and energy.

Findings

Muon bunch accelerated from 200 MeV to 2 GeV.

Acceleration field is six times higher with shaped LG laser.

Muon beam size focused from 5 μm to 1 μm within picoseconds.

Abstract

The recent experimental data of anomalous magnetic moments strongly indicate the existence of new physics beyond the standard model. An energetic $\mu^+$ beam is a potential option to the expected neutrino factories, the future muon colliders and the $\mu$SR(the spin rotation, resonance and relaxation) technology. It is proposed a prompt acceleration scheme of the $\mu^+$ 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 $ \mu^+$ bunch can be accelerated from $200\mathrm{MeV}$ to 2GeV and the transversal size of the $\mu^+$ bunch is also focused from initial $\omega_0=5\mu m$ to $\omega=1\mu m$ within several picoseconds.