Forward fitting of experimental data from a NE213 neutron detector installed with the magnetic proton recoil upgraded spectrometer at JET
- Department of Physics and Astronomy, EURATOM-VR Association, Uppsala University, Uppsala (Sweden)
In this paper, we present the results obtained from the data analysis of neutron spectra measured with a NE213 liquid scintillator at JET. We calculated the neutron response matrix of the instrument combining MCNPX simulations, a generic proton light output function measured with another detector and the fit of data from ohmic pulses. For the analysis, we selected a set of pulses with neutral beam injection heating (NBI) only and we applied a forward fitting procedure of modeled spectral components to extract the fraction of thermal neutron emission. The results showed the same trend of the ones obtained with the dedicated spectrometer TOFOR, even though the values from the NE213 analysis were systematically higher. This discrepancy is probably due to the different lines of sight of the two spectrometers (tangential for the NE213, vertical for TOFOR). The uncertainties on the thermal fraction estimates were from 4 to 7 times higher than the ones from the TOFOR analysis.
- OSTI ID:
- 22303710
- Journal Information:
- Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 Euratom; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION HEATING
COMPUTERIZED SIMULATION
DATA ANALYSIS
EXPERIMENTAL DATA
JET TOKAMAK
MONTE CARLO METHOD
NEUTRON DETECTION
NEUTRON SPECTRA
PROTON RECOIL DETECTORS
SCINTILLATION COUNTERS
SPECTROMETERS
THERMAL NEUTRONS
TIME-OF-FLIGHT SPECTROMETERS