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Neutron measurements on Joint European Torus using an NE213 scintillator with digital pulse shape discrimination

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12 Author(s)
Esposito, B. ; Associazione Euratom-ENEA sulla Fusione, C.R. Frascati, C.P. 65, 00044 Frascati, Rome, Italy ; Bertalot, L. ; Marocco, D. ; Riva, M.
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A digital pulse shape discrimination system (DPSD) has been used in conjunction with collimated NE213 scintillators for neutron spectroscopic measurements at high count rates (MHz range) in Joint European Torus discharges (DD and DT fueled, neutral beam injection and rf heated). The system, developed at ENEA-Frascati, is based on a commercial 200 MHz 12-bit analog to digital transient recorder card, which digitizes the direct output signal from the anode of a photomultiplier. Among the unique features of this DPSD system are the possibility of postexperiment data reprocessing, high count rate operation, and simultaneous neutron and gamma (γ) spectroscopy. Separation between γ and neutron (n) events is performed by means of dedicated software exploiting the charge comparison method; separate n and γ pulse height distributions are obtained and an example of neutron spectrum unfolding is shown. Implications of the DPSD in future neutron diagnostic systems on large and next step tokamaks are discussed.

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Review of Scientific Instruments  (Volume:75 ,  Issue: 10 )