Characterization of scintillator screens for suprathermal ion detection in fusion devices

Abstract

The luminescence of scintillator screens of Y 3 Al 5 O 12 :Ce 3+ (P46), Gd 2 O 2 S:Tb 3+ (P43), Y 2 O 3 :Eu 3+ (P56) and SrGa 2 S 4 :Eu 2+ (TG-Green) has been characterized when irradiated with deuterium ions and α-particles with energies up to 3 MeV. The relative efficiency of the scintillator layers deposited on stainless steel plates has been studied as a function of beam energy and current as well as ion species. The emitted light first increases linearly with beam energy and then saturates. A logarithmic decay of the efficiency with beam current has been observed for all scintillators. Furthermore, the scintillator degradation by high ion dose has been investigated. Among the screens under study, the TG-Green and P46 scintillators are the best suited materials, in terms of relative efficiency and degradation with ion dose, for fast-ion loss detection in fusion devices.

Multi-energy x-ray imaging and sensing for diagnostic and control of the burning plasma

“…Conversely, radiation hard phosphors, such as those studied for fast ion loss detection in ITER, can be an alternate option. 15 As concerns the compatibility of MCP intensifiers with the BP environment, multi-channel photomultipliers for use in the ITER gamma camera have been recently demonstrated to work at fields up to 1.75 T. 16 Radiation resistant and magnetic field insensitive MCP intensifiers are also being used in high energy and inertial confinement research. The optical array can also be designed to have the intensifier aligned with the magnetic field.…”

Characterization of scintillator screens under irradiation of low energy 133Cs ions

“…This process could be described as the de-excitation of stimulated electronic states, related either to valence electrons of particular atoms or to defects inside crystalline structures [4]. Previous work focused on the study of the ionoluminescence of several scintillators when they are irradiated by light ions, for its application in Fast Ion Loss Detectors (FILD) [5,6]. In this work we focus on the study of scintillator response to irradiation with heavy ions.…”