Figure 2: Measurement of large energy gradients in a dielectric wakefield accelerator. | Nature Communications

Figure 2: Measurement of large energy gradients in a dielectric wakefield accelerator.

From: Observation of acceleration and deceleration in gigaelectron-volt-per-metre gradient dielectric wakefield accelerators

Figure 2

(a) Histogram of the electron beam centroid energy after traversing a 300 μm inner diameter, 400 μm outer diameter, 15 cm-long dielectric structure (blue, 1,385 measurements) and without the structure (red, 937 measurements). Black lines mark the mean and green lines the 95% confidence intervals. The distribution resulting after beam passage through the dielectric wakefield accelerator structure widens due to the parametric dependencies of the energy loss. The measured average energy loss is 202±3 MeV; the decelerating gradient is thus 1.347±0.020 GeV m−1. (b) Theoretical prediction of longitudinal wake for the case of (a), showing 2.8 GV m−1 peak fields (normalized beam current in blue).

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