(Color online) (a) Photograph of an energy dispersed proton trace which is detected with a multichannel plate and phosphorous screen imaging device and a pinhole Thomson spectrometer, the imaging ratio is 1:1 (b) Detected proton trace with a magnified imaging ratio of 1:15, target and laser parameter (see the text).
Scheme of the geometry in the measurement: The source coordinates of the target are imaged to the detector plane via a pinhole and are dispersed due to their energy in the spectrometer (not depicted for simplicity) along a trace (gray shaded area) which will be compared to the ideal parabolic trace (parabolic line). The ideal trace is calculated from a source without directional emission fluctuation.
(Color) Result of the analysis of the recorded proton emission shown in Fig. 1(b). The source emission coordinates and are plotted as a function of proton energy.
Divergence of the beamlet calculated from the trace width of the recorded proton beam shown in Fig. 1(b) in dependence of the energy.
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