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Abstract

In order to cover a broad range of neutron spectra and fluxes during D-T operation in JET we propose the use of two different detector techniques: neutron induced reactions in a silicon surface barrier detector and neutron - proton elastic scattering in a liquid scintillator. Experimental investigations of 28-Si(n,alpha)25-Mg reactions have resulted in resolutions of DELTA-E(FWHM)/E about 0.02 with intrinsic efficiency equal to 10**-4 and a maximum useful count rate equal to 1600 c.p.s. However, due to overlap of adjacent peaks, caused by excited states of 25- Mg, this spectrometer has an operation range limited to FWHM/E less or about 0.04. For broader neutron distributions we propose the use of a conventional liquid scintillator system with a light guide, photomultiplier tube and modified conventional electronics. Experiments have demonstrated a resolution equal to 0.05 and a n - gamma separation better than 90 % at total count rates equal to 2.10**5 c.p.s.

Additional information

Authors: ELEVANT T ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN), ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN)
Bibliographic Reference: WRITE TO DEPARTMENT OF PLASMA PHYSICS AND FUSION RESEARCH, ROYAL INSTITUTE OF TECHNOLOGY, S-100 44 STOCKHOLM 70 (SWEDEN), MENTIONING REPORT TRITA-PFU-83-07, 1983
Record Number: 1989122047400 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en