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This paper describes the results from calculations with a Monte Carlo code, McKM3, which models the neutron transport of an upgraded 2.45 MeV neutron time-of-flight spectrometer recently installed at the JET Joint Laboratory. The old instrument has been successfully operated at JET for several years and measured the energy spectrum of the neutron emission from hot deuterium plasmas. The upgraded version of this instrument, with the same resolution and with approximately 6 times the efficiency, consists of two identical and cuboid organic scintillator start detectors and thirty identical organic scintillator stop detectors. The cylindrically shaped stop detectors are evenly distributed on the periphery of a constant time-of-flight sphere and positioned at a 30 degree scattering angle with respect to the start detectors. In this work, the response function for different thicknesses and areas of the start detectors has been investigated. Apart from finding a suitable compromise between efficiency and resolution, it was also important to find a geometry that kept the tails of the response function, arising from multiply scattered neutrons in the start detectors, at a low level.

Additional information

Authors: HOEK M, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)39 EN (1992) 29 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199211286 / Last updated on: 1994-11-29
Original language: en
Available languages: en