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We investigate the generation of twin $\gamma$ ray beams in collision of anultrahigh intensity laser pulse with a laser wakefield accelerated electronbeam by using particle-in-cell simulation. We consider the composed target of ahomogeneous underdense preplasma in front of an ultrathin solid foil. Theelectrons in the preplasma are trapped and accelerated by the wakefield. Whenthe laser pulse is reflected by the thin solid foil, the wakefield acceleratedelectrons continue to move forward and passing through the foil almost withoutthe influence of the reflected laser pulse and the foil. Consequently, twogroups of $\gamma$ ray flashes, with tunable time delay and energy, aregenerated by the wakefield accelerated electron beam interacting with thereflected laser pulse from the foil as well as another counter propagatingpetawatt laser pulse in the behind the foil. The dependence of the $\gamma$photon emission on the preplasma densities, driving laser polarization and thefoil are studied.

Two stage $\gamma$ ray emission via an ultrahigh intensity laser pulse interaction with a laser-wakefield accelerated electron beam