Response of a simple detector telescope to heavy ions compared with a Geant4 simulation. Data were collected at the LBNL 88-inch cyclotron using a cocktail beam containing a variety of 16 MeV nuc⁻¹ ions with M∕Q ≃ 2.9 including , , , , , and . Also shown is the response to He obtained from a collimated alpha-particle source. The measured response tracks (black) are compared with Geant4 simulations (dashed red lines) calculated assuming the same detector and dead-layer thicknesses used for calculating the tracks in Fig. 7. Left: schematic illustration of the telescope configuration consisting of two thin detectors followed by a thick detector. In front of the telescope was placed an “energy spreader” consisting of multiple layers of thin fabric mesh that served to provide a wide distribution of particle ranges entering the telescope. Top right: ΔE versus E′ tracks for particles stopping in the E2 detector. Bottom right: response tracks for particles stopping in the E3 detector.