Figure 1
From: Enhanced relativistic-electron beam collimation using two consecutive laser pulses
Evolution of the diameter of the emission area on target rear side of (a) Cu-Kα fluorescence and (b) CTR, as a function of the delay between the two laser pulses for different focal spot ratios: \({\phi }_{1}/{\phi }_{2}=2.5\) (red circles), \({\phi }_{1}/{\phi }_{2}=2.8\) (green triangles), \({\phi }_{1}/{\phi }_{2}=3\) (black squares). The dashed curves are guides for the eyes. Different vertical scales are used in (a) and (b).
