  We propose a scheme to generate gamma-ray photons with an orbital angular
momentum (OAM) and high energy simultaneously from laser-plasma interactions by
irradiating a circularly polarized Laguerre-Gaussian laser on a thin plasma
target. The spin angular momentum and OAM are first transferred to electrons
from the driving laser photons, and then the OAM is transferred to the
gamma-ray photons from the electrons through quantum radiation. This scheme has
been demonstrated using three-dimensional quantum electrodynamics
particle-in-cell simulation. The topological charge, chirality and
carrier-envelope phase of the short ultra-intense vortex laser can be revealed
according to the pattern feature of the energy density of radiated photons.
