One 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 intense neutron and gamma-ray fluxes expected during a DT campaign impose new requirements on detector characteristics used in such experiments. In addition to good energy resolution, detectors must also be characterized by a high signal-to-noise ratio and allow to perform measurements at high counting rate about 1 Mcps. The scintillators which fulfill these requirements are, among others, LaBr3:Ce, already tested at JET, and CeBr3 with a scintillation decay time of ∼20 ns. We report on measurements which were performed with a detector module equipped with a 3” × 3” CeBr3 scintillator and with an active voltage divider AVD@NCBJ, designed and constructed at NCBJ. Standard gamma-ray sources, as well as a PuBe source, were used for measurements. The comparison of measured and Monte Carlo simulated spectra is also presented.
Kwiatkowski, R., BoÅ‚truczyk, G., BrosÅ‚awski, A., Gosk, M., Korolczuk, S., Mianowski, S., et al. (2017). CeBr3–based detector for gamma-ray spectrometer upgrade at JET. FUSION ENGINEERING AND DESIGN, 123, 986-989 [10.1016/j.fusengdes.2017.02.103].
CeBr3–based detector for gamma-ray spectrometer upgrade at JET
Gorini, G.;Nocente, M.;Tardocchi, M.;
2017
Abstract
One 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 intense neutron and gamma-ray fluxes expected during a DT campaign impose new requirements on detector characteristics used in such experiments. In addition to good energy resolution, detectors must also be characterized by a high signal-to-noise ratio and allow to perform measurements at high counting rate about 1 Mcps. The scintillators which fulfill these requirements are, among others, LaBr3:Ce, already tested at JET, and CeBr3 with a scintillation decay time of ∼20 ns. We report on measurements which were performed with a detector module equipped with a 3” × 3” CeBr3 scintillator and with an active voltage divider AVD@NCBJ, designed and constructed at NCBJ. Standard gamma-ray sources, as well as a PuBe source, were used for measurements. The comparison of measured and Monte Carlo simulated spectra is also presented.
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