CeBr3-based detector for gamma-ray spectrometer upgrade at JET

tOne of the important techniques used at JET for studying fast ions is based on measurements of gamma-rays which are produced as a result of nuclear reactions between ions and plasma impurities. The intenseneutron and gamma-ray fluxes expected during a DT campaign impose new requirements on detectorcharacteristics used in such experiments. In addition to good energy resolution, detectors must also becharacterized by a high signal-to-noise ratio and allow to perform measurements at high counting rateabout 1 Mcps. The scintillators which fulfill these requirements are, among others, LaBr3:Ce, alreadytested at JET, and CeBr3with a scintillation decay time of ~20 ns. We report on measurements whichwere performed with a detector module equipped with a 3" × 3" CeBr3scintillator and with an activevoltage divider AVD@NCBJ, designed and constructed at NCBJ. Standard gamma-ray sources, as well asa PuBe source, were used for measurements. The comparison of measured and Monte Carlo simulatedspectra is also presented.© 2017 Elsevier B.V. All rights reserved