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New, dedicated detectors based on a LaBr3 crystal and silicon photo-multipliers have been developed and replaced pre-existing CsI detectors in all 19 channels. The new instrument gives opportunity of making two-dimensional gamma-ray measurements with a counting rate capability exceeding 1 MCounts\/s (MCps) and energy resolution better than 5% at 1.1 MeV. The upgrade is of relevance for fast ion and runaway electron physics studies in high performance deuterium discharges and also in plasmas with tritium at neutron yields in the range up to about 5 \u00d7 1017 n\/s.<\/jats:p>","DOI":"10.1063\/1.5038839","type":"journal-article","created":{"date-parts":[[2018,10,4]],"date-time":"2018-10-04T15:52:21Z","timestamp":1538668341000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":26,"title":["The upgraded JET gamma-ray cameras based on high resolution\/high count rate compact spectrometers"],"prefix":"10.1063","volume":"89","author":[{"given":"D.","family":"Rigamonti","sequence":"first","affiliation":[{"name":"Istituto di Fisica del Plasma \u201cP. 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