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Abstract

We propose the use of n-d back scattering for neutron time of flight measurements. It is shown that the back scattering geometry presents significant advantages to conventional n-p spectrometers. The expected performance limits of the new spectrometer with regard to energy resolution ("TRIANGLE"E/E), efficiency(epsilon), count rate and dynamic range are evaluated together with practical considerations such as the effects of background radiation. The results are used to derive an optimized spectrometer design for applications at large fusion tokamaks such as JET with epsilon and "TRIANGLE"E/E being variable in the ranges 1.0 <= "TRIANGLE"E/E <= 2.7% and 2.10**-3 <= epsilon <= 8.10**-3 cm**2. The instrument could also be used to measure the minority component of d-t reactions in deuterium plasmas.

Additional information

Authors: KAELLNE J JET JOINT UNDERTAKING, ABINGDON (UK) ELEVANT T ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN) , JET JOINT UNDERTAKING, ABINGDON (UK);ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN)
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(85)03, 1985
Record Number: 1989123088800 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en