The neutron camera upgrade for MAST Upgrade.

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ID: 97187
2018
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Abstract
The Neutron Camera Upgrade (NCU) is a neutron flux monitor consisting of six lines of sight (LoSs) under installation on Mega Ampere Spherical Tokamak (MAST) Upgrade. The NCU is expected to contribute to the study of the confinement of fast ions and on the efficiency of non-inductive current drive in the presence of on-axis and off-axis neutral beam injection by measuring the neutron emissivity profile along the equatorial plane. This paper discusses the NCU main design criteria, the engineering and interfacing issues, and the solutions adopted. In addition, the results from the characterization and performance studies of the neutron detectors using standard -rays sources and a Cf source are discussed. The proposed design has a time resolution of 1 ms with a statistical uncertainty of less than 10% for all MAST Upgrade scenarios with a spatial resolution of 10 cm: higher spatial resolution is possible by moving the LoSs in-between plasma discharges. The energy resolution of the neutron detector is better than 10% for a light output of 0.8 MeVee, and the measured pulse shape discrimination is satisfactory.
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Authors Cecconello, M;Sperduti, A;Fitzgerald, I;Conroy, S;Holm, S J;Weiszflog, M;
Journal The Review of scientific instruments
Year 2018
DOI
10.1063/1.5038948
URL
Keywords
cosmic rays cosmogenic neutrons geomagnetic pole neutron detectors secondary cosmic rays

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