Fig. 6.

Generated electron beams. The number (units of $10^8$) of electrons with energies above 10 MeV as a function of ($\theta$, $y$, $\epsilon$) at 30 ${\tau }_0$, where Insets in each plot show number distributions at angles of $1^{○}$, $10^{○}$, and $12^{○}$ corresponding to curves in different colors. The left (A and C) and right columns (B and D) correspond to 0.6 $\mathrm{\mu }\mathrm{m}$ and 0.3 $\mathrm{\mu }\mathrm{m}$ wires, respectively. In A and C, the electron beam at the angle about $1^{○}$ is circled.