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. 2016 Nov;87(11):11E717.
doi: 10.1063/1.4961060.

Performance of the prototype LaBr3 spectrometer developed for the JET gamma-ray camera upgrade

D Rigamonti  1 , A Muraro  2 , M Nocente  1 , V Perseo  1 , G Boltruczyk  3 , A Fernandes  4 , J Figueiredo  4 , L Giacomelli  2 , G Gorini  1 , M Gosk  3 , V Kiptily  5 , S Korolczuk  3 , S Mianowski  3 , A Murari  6 , R C Pereira  4 , E P Cippo  2 , I Zychor  3 , M Tardocchi  2 ; JET Contributors  7
Affiliations

Performance of the prototype LaBr3 spectrometer developed for the JET gamma-ray camera upgrade

D Rigamonti et al. Rev Sci Instrum. 2016 Nov.

Abstract

In this work, we describe the solution developed by the gamma ray camera upgrade enhancement project to improve the spectroscopic properties of the existing JET γ-ray camera. Aim of the project is to enable gamma-ray spectroscopy in JET deuterium-tritium plasmas. A dedicated pilot spectrometer based on a LaBr3 crystal coupled to a silicon photo-multiplier has been developed. A proper pole zero cancellation network able to shorten the output signal to a length of 120 ns has been implemented allowing for spectroscopy at MHz count rates. The system has been characterized in the laboratory and shows an energy resolution of 5.5% at Eγ = 0.662 MeV, which extrapolates favorably in the energy range of interest for gamma-ray emission from fast ions in fusion plasmas.

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