Efficiency of a Time-of-Flight Detection System for Analysis of Wall Material From Controlled Fusion Devices

Abstract: Time-of-flight elastic recoil detection analysis (ToFERDA)is a method for material analysis which has provenadvantageous when examining wall samples from fusion devicesas well as for tracking tracer isotopes such as deuterium, oxygen-18 and nitrogen-15. When ToF-ERDA data is processed tocalculate the composition of a material, the detection efficiencyis used to compensate for the lower detection rate of lighterelements. The aim of this project is to examine how the efficiencyof the time-of-flight detector in a ToF-ERDA experimental setupdepends on its settings and determine efficiency parameters touse when producing atomic composition depth profiles with ToFERDA.Experiments were performed at the Tandem Laboratoryin Uppsala. The outcome is a suggested set of changes toexperimental settings and a four-parameter fit to measureddetection efficiencies for efficiency compensation.