The JET neutron time-of-flight spectrometerFunded under: FP2-FUSION 10C
A novel instrument for measuring neutron energy spectra over the interval 2-3 MeV is described. It is based on Time-of-Flight measurements between correlated events in two spatially separated sets of plastic scintillators. The required operating conditions, performance tests and results are described for two years of operation, during which neutron energy spectra in the 2-3 MeV range from D(d,n)3He reactions in JET were studied. The results from Monte-Carlo and analytical model calculations of the spectrometer energy resolution and response function are presented. Correction for the inevitable random background is dealt with in detail and a reduction procedure valid for fast variations in neutron count-rates is provided. Plasma ion temperatures deduced from the neutron spectra agree within statistical limitations with the results from other diagnostic techniques in use at JET. Stable behaviour up to useful count-rates of 3000 counts per second have been obtained, making possible the study of neutron spectra on the short time scales typical of fusion plasmas.
Bibliographic Reference: Report: JET-P(89)76 EN (1989) 36 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199011407 / Last updated on: 1994-12-02
Original language: en
Available languages: en