MIT fusion γ‐ray diagnostic development

In conjunction with γ‐ray diagnostic development for the NOVA Upgrade and Alcator C‐MOD experiments, we have assembled a comprehensive set of absolutely calibrated γ‐ray sources and several γ‐ray detectors. These tools will be used in characterizing and calibrating new γ‐ray diagnostic systems as they are assembled. The γ‐ray sources comprise both radioisotopes and nuclear reactions. The latter are generated in the MIT Cockcroft–Walton fusion‐product generator. The detectors include several ‘‘standard’’ NaI(Tl) scintillators and a high‐resolution germanium detector. This paper briefly discusses the diagnostics planned for NOVA Upgrade and Alcator C‐MOD. In addition it describes the γ‐ray sources and detector characterizations we have performed in the laboratory.