The products of fusion reactions at JET are measured using different diagnostic techniques. One of the methods is based on measurements of gamma-rays, originating from reactions between fast ions and plasma impurities. During the forthcoming deuterium-tritium (DT) campaign a particular attention will be paid to 4.44 MeV gamma-rays emitted in the 9Be(α,nγ)12C reaction. Gamma-ray detectors foreseen for measurements in DT campaigns have to be able to register spectra at high count rates, up to approximately 500 kHz. For the Gamma-ray Camera at JET a new setup will be based on scintillators with a short decay time, e.g., CeBr3, and a multi-pixel photon counter (MPPC). We present two methods of output signal shortening in modules based on MPPC. A short detector output signal is necessary in order to minimize the number of pile up events at high count rates. One method uses a passive RC circuit with a pole zero cancellation, whereas an active transimpedance amplifier is used in the other one. Due to the strong dependence of MPPC properties on temperature variation, a special device MTCD@NCBJ was designed and produced to stabilize the gain in MPPC-based scintillation detectors. We show that this device guarantees stable working conditions.

Boltruczyk, G., Broslawski, A., Gosk, M., Korolczuk, S., Kwiatkowski, R., Linczuk, M., et al. (2017). Development of MPPC-based detectors for high count rate DT campaigns at JET. FUSION ENGINEERING AND DESIGN, 123, 940-944 [10.1016/j.fusengdes.2017.03.040].

Development of MPPC-based detectors for high count rate DT campaigns at JET

NOCENTE, MASSIMO;RIGAMONTI, DAVIDE;TARDOCCHI, MARCO
Penultimo
;
2017

Abstract

The products of fusion reactions at JET are measured using different diagnostic techniques. One of the methods is based on measurements of gamma-rays, originating from reactions between fast ions and plasma impurities. During the forthcoming deuterium-tritium (DT) campaign a particular attention will be paid to 4.44 MeV gamma-rays emitted in the 9Be(α,nγ)12C reaction. Gamma-ray detectors foreseen for measurements in DT campaigns have to be able to register spectra at high count rates, up to approximately 500 kHz. For the Gamma-ray Camera at JET a new setup will be based on scintillators with a short decay time, e.g., CeBr3, and a multi-pixel photon counter (MPPC). We present two methods of output signal shortening in modules based on MPPC. A short detector output signal is necessary in order to minimize the number of pile up events at high count rates. One method uses a passive RC circuit with a pole zero cancellation, whereas an active transimpedance amplifier is used in the other one. Due to the strong dependence of MPPC properties on temperature variation, a special device MTCD@NCBJ was designed and produced to stabilize the gain in MPPC-based scintillation detectors. We show that this device guarantees stable working conditions.
Articolo in rivista - Articolo scientifico
Decay time; Energy resolution; Gamma-ray spectrometry; MPPC; Scintillators; Tokamak; Nuclear Energy and Engineering; Mechanical Engineering
English
2017
123
940
944
none
Boltruczyk, G., Broslawski, A., Gosk, M., Korolczuk, S., Kwiatkowski, R., Linczuk, M., et al. (2017). Development of MPPC-based detectors for high count rate DT campaigns at JET. FUSION ENGINEERING AND DESIGN, 123, 940-944 [10.1016/j.fusengdes.2017.03.040].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/168237
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