A 14 MeV neutron spectrometer for the Joint European Torus deuterium-tritium experiments

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Particle Measurements, Neutron Spectroscopy, Tokamaks, Spherical Tokamaks, Components And Instrumentation, Solid-State Detectors, Fueling, Heating And Ignition, Fusion Products Effects, Fast Particle Effects

Scientific paper

A 14 MeV neutron spectrometer, based on the principle of the proton recoil telescope, has been installed as a deuterium-tritium (DT) plasma diagnostic at the Joint European Torus. The device comprises three identical telescope modules arranged one behind the other, to increase efficiency without worsening resolution. It views the plasma along a horizontal line of sight. The total efficiency is 7.05×10-5 counts per (neutron per cm2), and the calculated response function has a full width at half maximum of 2.2% at an incident neutron energy of 14.1 MeV. The spectrometer was operational throughout the recent DT experiment No. 1, and selected neutron spectra have been analyzed in terms of the contributions from the various neutron production mechanisms.

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