Fig. 4.

Trace of typical electrons. Evolution for an electron from the 0.6 $\mathrm{\mu }\mathrm{m}$ (A and C) and 0.3 $\mathrm{\mu }\mathrm{m}$ wires (B and D), respectively, is shown for the transverse position y ($\mathrm{\mu }m$), $E_y-B_z$ (units of $1000m_{e}c{\omega }_0/e$), divergence angle $\theta$ (units of $30^{○}$), energy $\epsilon$ (units of 5 GeV), and QED parameter $\chi$, where we plot $y+0.3$ in A, since the electron wiggles around $-0.3\hspace{0.17em}\mathrm{\mu }\mathrm{m}$.