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A time-of-flight neutron spectrometer for DT-plasma diagnostics

Technical Report:

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).
Publication Date:
Jun 01, 1991
Product Type:
Technical Report
Report Number:
TRITA-PFU-91-07
Reference Number:
SCA: 700320; PA: AIX-23:013622; SN: 92000639315
Resource Relation:
Other Information: PBD: Jun 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TIME-OF-FLIGHT SPECTROMETERS; PLASMA DIAGNOSTICS; BENCH-SCALE EXPERIMENTS; EXPERIMENTAL DATA; FAST NEUTRONS; MEV RANGE 01-10; MEV RANGE 10-100; SIMULATION; 700320; PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION
OSTI ID:
10111668
Research Organizations:
Royal Inst. of Tech., Stockholm (Sweden). Dept. of Plasma Physics and Fusion Research
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE92614453; TRN: SE9100269013622
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
SWDN
Size:
52 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}