Abstract
A neutron time-of-flight spectrometer is proposed for spectral measurements of 14 MeV neutrons, generated in deuterium plasma through consecutive d(d,t)p and d(t,n){alpha} reactions, i.e. minority d-t neutrons. According to numerical simulations, spectral width, average energy and fluxes of neutrons depend on confinement and slowing down of the tritons in which the electron temperature plays a significant role. Neutrons, backscattered in a deuterated first scintillator are detected in a second hydrogen based scintillator. Laboratory tests, with an efficiency of 8 x 10{sup -6} cm{sup 2} provide a resolution equal to 2.2%, which scales reciprocally to the flight path length. A reference spectrometer is suggested for measurements at JET, with an efficiency of 2.7 x 10{sup -2} cm{sup 2} and an energy resolution better than 3%, which enables spectral measurements of 14 MeV minority neutrons in the emission interval 5 x 10{sup 13} - 10{sup 16} s{sup -1}, provided neutron filters are utilized. An upgraded version of the device, aimed for spectral measurements of 14 MeV neutrons from DT-plasmas, is suggested. In this case the resolution is 2.0% and the maximum efficiency 2.9 x 10{sup -3} cm{sup 2}. (au).
Citation Formats
Olsson, M, and Elevant, T.
A time-of-flight neutron spectrometer for DT-plasma diagnostics.
Sweden: N. p.,
1991.
Web.
Olsson, M, & Elevant, T.
A time-of-flight neutron spectrometer for DT-plasma diagnostics.
Sweden.
Olsson, M, and Elevant, T.
1991.
"A time-of-flight neutron spectrometer for DT-plasma diagnostics."
Sweden.
@misc{etde_10111668,
title = {A time-of-flight neutron spectrometer for DT-plasma diagnostics}
author = {Olsson, M, and Elevant, T}
abstractNote = {A neutron time-of-flight spectrometer is proposed for spectral measurements of 14 MeV neutrons, generated in deuterium plasma through consecutive d(d,t)p and d(t,n){alpha} reactions, i.e. minority d-t neutrons. According to numerical simulations, spectral width, average energy and fluxes of neutrons depend on confinement and slowing down of the tritons in which the electron temperature plays a significant role. Neutrons, backscattered in a deuterated first scintillator are detected in a second hydrogen based scintillator. Laboratory tests, with an efficiency of 8 x 10{sup -6} cm{sup 2} provide a resolution equal to 2.2%, which scales reciprocally to the flight path length. A reference spectrometer is suggested for measurements at JET, with an efficiency of 2.7 x 10{sup -2} cm{sup 2} and an energy resolution better than 3%, which enables spectral measurements of 14 MeV minority neutrons in the emission interval 5 x 10{sup 13} - 10{sup 16} s{sup -1}, provided neutron filters are utilized. An upgraded version of the device, aimed for spectral measurements of 14 MeV neutrons from DT-plasmas, is suggested. In this case the resolution is 2.0% and the maximum efficiency 2.9 x 10{sup -3} cm{sup 2}. (au).}
place = {Sweden}
year = {1991}
month = {Jun}
}
title = {A time-of-flight neutron spectrometer for DT-plasma diagnostics}
author = {Olsson, M, and Elevant, T}
abstractNote = {A neutron time-of-flight spectrometer is proposed for spectral measurements of 14 MeV neutrons, generated in deuterium plasma through consecutive d(d,t)p and d(t,n){alpha} reactions, i.e. minority d-t neutrons. According to numerical simulations, spectral width, average energy and fluxes of neutrons depend on confinement and slowing down of the tritons in which the electron temperature plays a significant role. Neutrons, backscattered in a deuterated first scintillator are detected in a second hydrogen based scintillator. Laboratory tests, with an efficiency of 8 x 10{sup -6} cm{sup 2} provide a resolution equal to 2.2%, which scales reciprocally to the flight path length. A reference spectrometer is suggested for measurements at JET, with an efficiency of 2.7 x 10{sup -2} cm{sup 2} and an energy resolution better than 3%, which enables spectral measurements of 14 MeV minority neutrons in the emission interval 5 x 10{sup 13} - 10{sup 16} s{sup -1}, provided neutron filters are utilized. An upgraded version of the device, aimed for spectral measurements of 14 MeV neutrons from DT-plasmas, is suggested. In this case the resolution is 2.0% and the maximum efficiency 2.9 x 10{sup -3} cm{sup 2}. (au).}
place = {Sweden}
year = {1991}
month = {Jun}
}