Use of the sup 28 Si( n , p ) sup 28 Al reaction for the measurement of 14 MeV neutrons from fusion plasmas

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1141678· OSTI ID:6205722

Sadler, G; Jarvis, O N; van Belle, P; Pillon, M ^[1]

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1. JET Joint Undertaking Abingdon, Oxfordshire OX14 3EA (United Kingdom)

The {sup 28}Si({ital n}, {ital p}){sup 28}Al reaction is shown to be ideal for monitoring the emission of 14 MeV neutrons from {ital d}-{ital t} fusion plasmas. The daughter nuclide, {sup 28}Al, has a 2.246 min half-life and so is suitable for studying discharges of up to 1 min duration; the decay gamma radiation has an energy of 1.779 MeV and is easily detected with a NaI(Tl) detector. The same sample can be recycled for successive JET discharges and the data taking is fully automatic. Absolute neutron yields are obtained by calibrating with the standard {sup 63}Cu({ital n}, 2{ital n}){sup 62}Cu reaction. The effective threshold energy of 5 MeV completely discriminates against 2.5 MeV {ital d}-{ital d} neutrons, making this reaction also highly appropriate for the study of the 14 MeV neutrons emitted during the burnup of the 1.0 MeV tritons produced in the second branch of the {ital d}-{ital d} reaction. Some results from this application will be presented.

• OSTI ID: 6205722
• Journal Information: Review of Scientific Instruments; (USA), Vol. 61:10; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
NEUTRON DETECTORS
CALIBRATION
PLASMA DIAGNOSTICS
TOKAMAK DEVICES
NEUTRON FLUENCE
COPPER 63 TARGET
D-D REACTORS
NEUTRON REACTIONS
PERFORMANCE
BARYON REACTIONS
CLOSED PLASMA DEVICES
HADRON REACTIONS
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
NUCLEON REACTIONS
RADIATION DETECTORS
TARGETS
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics
440103 - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation