Figure 6
From: Enhancing laser-driven proton acceleration by using micro-pillar arrays at high drive energy

(a) The Thomson parabola ion spectrometer energy disperses and charge separates protons and carbon ions accelerated behind a micro-pillar target. (b) The electron spectrometer deflects the electrons escaping from the target according to their energies. The origin point and the reference line are fiducial markers for the energy calibration of the instruments.