| Zugriffsnummer | 22320 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Compact neutron spectrometer and their performance under fusion-relevant conditions |
| Autor(in); Institution |
Zimbal, Andreas; 6.5, Neutronenstrahlung, PTB-Braunschweig
Reginatto, Marcel; 6.5, Neutronenstrahlung, PTB-Braunschweig
Schuhmacher, Helmut; 6.5, Neutronenstrahlung, PTB-Braunschweig
|
| Quelle/Jahr | Burning plasma diagnostic:(2008), 323 - 326 |
| Schriftenreihe | AIP conference proceedings: 988 |
| Herausgeber(in) |
Orsitto, Francesco P.
|
| ISBN | 978-0-7354-0507-3 |
| Verlag | Melville, NY: American Institute of Physics |
| Konferenzangaben | Burning Plasma Diagnostics, an International Conference, Varenna, 24-28, September, 2007, Italy |
| Klassifikationscode | PACS: 52.70.-m ; PACS: 29.30.-h |
| Freie Schlagworte | Neutron spectrometry ; Fusion diagnostics ; Scintillator ; Bayesian methods |
| Zusammenfassung | The Physikalisch-Technische Bundesanstalt (PTB) has many years of experience with the development, detailed characterization and use of organic liquid scintillation detectors. Such detectors, e.g. NE213, are routinely used as high resolution compact neutron spectrometers in many nuclear experiments. In recent years, a series of measurements with a carefully characterized detector was carried out by PTB in collaboration with ENEA and EFDA-JET at the Joint European Torus (JET). The results show that these detectors can be used as high resolution compact neutron spectrometers for diagnostic purposes in fusion research. The neutron energy spectrum can be reliably determined from the acquired pulse height spectrum provided the response function of the detector is well determined, a suitable unfolding method is applied and care is taken to ensure stable operation of the system during the measurement. We describe in this paper tests of the performance of the spectrometer carried out at the PTB accelerator. The irradiation facilities at PTB are well suited for such investigations since they allow testing of neutron and photon detectors over a wide range in energy and intensity. Among the reference neutron fields available, there are fields with energies of 2.5 MeV and 14 MeV, produced by means of D(d,n) and T(d,n) reactions. Detailed calculations of the energy spectra have been carried out, and they indicate that the widths of the peaks are comparable to those of thermal fusion plasmas with Maxwellian temperatures of the order of 1 keV. Measurements carried out with a compact neutron spectrometer under fusion-relevant conditions (i.e., using reference fields with energies of 2.5 MeV and 14 MeV and suitable ranges of count rates and statistics) are discussed in terms of the energy resolution that is achievable and the influence of the different irradiation conditions. |
