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The 2.5 MeV neutron flux monitor for MAST
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2014 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 753, 72-83 p.Article in journal (Refereed) Published
Abstract [en]

A proof-of-principle collimated Neutron flux Camera (NC) monitor for the measurement of the 2.45 MeV neutron emission from the deuterium–deuterium fusion reactions has been developed, installed and put into use at the Mega Ampere Spherical Tokamak (MAST). The NC measures the spatial and time resolved volume integrated neutron emissivity in deuterium fusion plasmas in the presence of auxiliary plasma heating along two equatorial and two diagonal lines of sight whose tangency radius can be varied between plasma discharges. This paper describes the NC design principles, their technical realization and its performances illustrated with experimental observations of different plasma scenarios. Neutron count rates in the range 0.1–1.5 MHz are routinely observed allowing time resolutions as high as 1 ms with a statistical uncertainty less than 10% and an energy threshold of 0.5 MeV. Examples of the effect of plasma instabilities on the neutron emission are presented. The good results obtained will be used for the design of the neutron flux camera monitor for MAST Upgrade.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 753, 72-83 p.
Keyword [en]
Neutron flux monitor, Liquid scintillator, Fusion diagnostics
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-179054DOI: 10.1016/j.nima.2014.03.060ISI: 000336547500010ScopusID: 2-s2.0-84899454408OAI: oai:DiVA.org:kth-179054DiVA: diva2:881151
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QC 20151214

Available from: 2015-12-09 Created: 2015-12-09 Last updated: 2015-12-14Bibliographically approved

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Ström, Petter
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Fusion, Plasma and Space Physics

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