Development of an high resolution neutron spectroscopy system using a diamond detector and a remote digital acquisition methodology |
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| Affiliation: | 1. Associazione EURATOM-ENEA sulla Fusione, ENEA C.R. Frascati, via E. Fermi, 45, 00044 Frascati (Rome), Italy;2. University of Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy;3. Istituto Nazionale di Fisica Nucleare, Sezione Tor Vergata, via della Ricerca Scientifica, 1, 00133 Rome, Italy;1. Association KIT-Euratom, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;2. European Fusion Development Agreement (EFDA), Garching, Germany;3. Association IPPLM-Euratom, IPPLM Warsaw/INP Krakow, Poland;4. Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain;5. Fusion for Energy (F4E), Barcelona, Spain;6. MESCS-JSI, Ljubljana, Slovenia;7. CEA, DEN, Saclay, DM2S, SERMA, F-91191 Gif-sur-Yvette, France;8. Associazione ENEA-Euratom, ENEA Fusion Division, Frascati, Italy;9. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain;10. Budapest University of Technology and Economics (BME), Budapest, Hungary;11. Euratom/CCFE Fusion Association, Culham Science Centre for Fusion Energy (CCFE), Culham, UK;1. Department of Energy System Engineering, Seoul National University, Seoul, Republic of Korea;2. Center for Advance Research in Fusion Reactor Engineering, Seoul National University, Seoul, Republic of Korea;3. ITER Korea, National Fusion Research Institute, Daejeon, Republic of Korea;4. ITER Organization, Route de Vinon sur Verdon, 13115 Saint Paul-lez-Durance, France;1. VTT Technical Research Centre of Finland, P.O. Box 1300, FI-33101 Tampere, Finland;2. Tampere University of Technology, Korkeakoulunkatu 6, 33720 Tampere, Finland;1. CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain;2. IDOM, Avda. Monasterio de El Escorial 4, 28049 Madrid, Spain |
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| Abstract: | The need of performing high resolution fast neutron spectroscopy in a very harsh environment like that of the Radial Neutron Camera (RNC) of ITER, requires to develop new detectors and methodologies. Diamond detectors have been proved to be excellent candidates but the electronics needs a substantial improvement. Because of the high radiation level and the temperatures expected near the detector positions in the RNC, the electronics must be placed several meters away. A novel Fast Charge Amplifier (FCA) was developed that, connected to a diamond detector using several tens of meters of low capacitance coaxial cable, is able to produce fast output signals suitable to be processed by digital electronics. These fast output signals allow to operate at high count rates avoiding pile-up problems. This novel amplifier connected to a digitizer is here tested in the neutron energy range from 5 to 20.5 MeV using the mono-energetic neutrons produced by the Van de Graaff (VdG) accelerator of the EC-JRC-IRMM and by the PTB cyclotron. From the measurements the experimental response functions of the diamond detector at different neutron energies were obtained. The shape of the response functions have been compared with that predicted with a routine which was implemented for the Monte Carlo code MCNPX with the scope to validate the calculations versus the experimental data. The goal is to develop a tool which allows to calculate the diamond detector response functions also in term of absolute efficiency. This methodology along with the ability to measure at high reaction rates and the insensitivity to radiation damage launches the system described in this paper as a promising method for neutron spectrometry in the RNC of ITER. |
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| Keywords: | Neutron spectroscopy Diamond detectors Digital electronics Fusion neutron diagnostics |
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