379304.fig.002
Figure 2: Schematic view of the FIB detector’s sensor. One layer consists of 16 plastic scintillator bars with dimensions of 3 mm (height) × 6 mm (width) × 96 mm (length). The direction of the Sun is identified by tracking two layers of the scintillator in both and directions; the energy of neutrons is measured by the range of protons.