Fig. 2.

Generated gamma rays. 3D isosurfaces of (A) the laser field ($mc{\omega }_0/e$) and (B) gamma-ray photon density ($n_c$) at the time of 30 ${\tau }_0$ as well as the slices at the planes with respective peak values, where a $0.6\hspace{0.17em}\mathrm{\mu }\mathrm{m}$-wide wire is taken. Note that the laser pulse peak arrives at the focusing plane at about 30 ${\tau }_0$. (C) Angular distributions and (D) energy spectra of gamma rays emitted from the wire and a flat slab target, respectively.