Abstract
A detection system for heavy residues at low energies consisting of a time-of-flight (TOF) system and a ΔE- E R telescope is described. The start signal of the TOF system is obtained from a microchannelplate detector of the mirror type. The ΔE- E R telescope consists of an ionization counter as transmission detector and array of silicon surface barrier detectors to stop the heavy ions. The two position coordinates of the trajectory of the heavy ions are both determined with the drift time method. The intrinsic time resolution of the TOF system, measured with 47 MeV 63Cu ions, is 175 ps. The energy resolution of the ΔE- E R telescope is 310 keV for 39 MeV 12C ions, which is mainly due to the spread in the energy loss in the entrance window of the ionization chamber. The energy-loss resolution is mainly determined by energy straggling in the gas. The largest contribution to the position resolution is caused by multiple scattering in the counter gas.
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