Heavy ion stopping power measurements with transmission methods
In this thesis experimental stopping power values have been determined at the Department of Physics, University of Jyväskylä. The studies have been performed with three variations of the transmission techniques, two conventional transmission methods and the novel time-of-flight (TOF) based method that provides continuous stopping power curves. Time-of-flight based method presented in this thesis extends the point-by-point measurements traditionally carried out by conventional transmission methods to continuous stopping power curves. Also, a TOF based measurement setup for simultaneous determination of stopping powers for several different ions at wide energy range is presented. The experimental measurements have been performed for several compound materials: havar, polyethylene terephthalate (mylar) and polycarbonate (lexan). Havar is a high strength metal alloy whereas mylar and polycarbonate are polymers. Materials have been selected because of their wide use in various applications, such as absorbers, windows, particle identification and radiation detection. Ions used in this study range from oxygen (O16) up to iodine (I127) with energies ranging from 0.35 to 5.0 MeV/u. The results acquired with different methods are compared with each other and previous literature and theoretical values. The results obtained with the different techniques agree well with each other and previous experimental values. Reasonable agreement can be seen also when compared with values obtained by various parameterisations.
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