A new high efficiency, high resolution, fast gamma-ray spectrometer was recently installed at the JET tokamak. The spectrometer is based on a LaBr3(Ce) scintillator coupled to a photomultiplier tube. A digital data acquisition system is used to allow spectrometry with event rates in excess of 1 MHz expected in future JET DT plasmas. However, at the lower rates typical of present day experiments, digitization can degrade the energy resolution of the system, depending on the algorithms used for extracting pulse height information from the digitized pulses. In this paper, the digital and analog spectrometry methods were compared for different experimental conditions. An algorithm based on pulse shape fitting was developed, providing energy resolution equivalent to the traditional analog spectrometry method

Nocente, M., Tardocchi, M., Chugunov, I., Pereira, R., Edlington, T., Fernandes, A., et al. (2010). Energy resolution of gamma-ray spectroscopy of JET plasmas with a LaBr3 scintillator detector and digital data acquisition. REVIEW OF SCIENTIFIC INSTRUMENTS, 81(10) [10.1063/1.3501386].

Energy resolution of gamma-ray spectroscopy of JET plasmas with a LaBr3 scintillator detector and digital data acquisition

NOCENTE, MASSIMO;GORINI, GIUSEPPE;
2010

Abstract

A new high efficiency, high resolution, fast gamma-ray spectrometer was recently installed at the JET tokamak. The spectrometer is based on a LaBr3(Ce) scintillator coupled to a photomultiplier tube. A digital data acquisition system is used to allow spectrometry with event rates in excess of 1 MHz expected in future JET DT plasmas. However, at the lower rates typical of present day experiments, digitization can degrade the energy resolution of the system, depending on the algorithms used for extracting pulse height information from the digitized pulses. In this paper, the digital and analog spectrometry methods were compared for different experimental conditions. An algorithm based on pulse shape fitting was developed, providing energy resolution equivalent to the traditional analog spectrometry method
Articolo in rivista - Articolo scientifico
Scientifica
gamma ray spectrometer; fusion plasma; JET
English
Nocente, M., Tardocchi, M., Chugunov, I., Pereira, R., Edlington, T., Fernandes, A., et al. (2010). Energy resolution of gamma-ray spectroscopy of JET plasmas with a LaBr3 scintillator detector and digital data acquisition. REVIEW OF SCIENTIFIC INSTRUMENTS, 81(10) [10.1063/1.3501386].
Nocente, M; Tardocchi, M; Chugunov, I; Pereira, R; Edlington, T; Fernandes, A; Gin, D; Grosso, G; Kiptily, V; Murari, A; Neto, A; Perelli Cippo, E; Pietropaolo, A; Proverbio, I; Shevelev, A; Sousa, J; Syme, B; Gorini, G; JET EFDA, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/27734
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