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• 15:18, 6 July 2017 MatthieuHentz talk contribs uploaded File:First tube 500 sim.png (A visualisation of the first tube with 500 primary protons shown as blue tracks. The protons first travel through the collimator, followed by the first scattering foil which spreads out the beam. The brass stopper then blocks out approximately half of the remaining protons before the beam is again spread out through the second scattering foil. The intention is to produce a wide, homogeneous beam. The particles exit the first tube through a Kapton window which is used to keep the tube under vacuum to reduce random scattering off air molecules.)