Title of article
The 2.5 MeV neutron flux monitor for MAST
Author/Authors
Ivan Cecconello، نويسنده , , M. and Sangaroon، نويسنده , , S. and Conroy، نويسنده , , S. and Donato، نويسنده , , M. and Ericsson، نويسنده , , G. and Marini-Bettolo، نويسنده , , C. and Ronchi، نويسنده , , R. and Stro¨m، نويسنده , , P. and Weiszflog، نويسنده , , M. and Wodniak، نويسنده , , I. and Turnyanskiy، نويسنده , , Ann M. Stewart-Akers، نويسنده , , R. and Cullen، نويسنده , , A. and Fitzgerald، نويسنده , , I. and McArdle، نويسنده , , G. and Pacoto، نويسنده , , C. and Thomas-Davies، نويسنده , , N.، نويسنده ,
Pages
12
From page
72
To page
83
Abstract
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.
Keywords
Fusion diagnostics , Neutron flux monitor , Liquid scintillator
Journal title
Astroparticle Physics
Record number
2012226
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