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Abstract

This paper provides a description of the diagnostic systems and techniques, based on the detection of nuclear fusion reaction products, which have been exploited at JET in order to obtain information on plasma conditions. The presentation has been illustrated with experimental findings which represent the first results from the various systems. These results have already been published, usually in Conference Proceedings. It is worth noting that in all cases the interpretation of the data is not entirely satisfactory: this may be because the fundamental understanding is imperfect, because our modelling techniques and the computational power available are inadequate or because the supplementary data on plasma conditions required for a complete plasma description are imprecise or even lacking. For the future we can expect that the simultaneous analysis of all the neutron diagnostics measurements will lead to an acceptable understanding of the neutron emission. The study of proton and gamma-ray emission addresses rather different problems, those of sawtooth internal disruptions and of ion energy distributions resulting from the application of intense ICRF heating. Taken together, the study of fusion reaction products provides a powerful weapon for examining the behaviour of thermonuclear plasmas.

Additional information

Authors: JARVIS O N JET JOINT UNDERTAKING, ABINGDON, UK, JET JOINT UNDERTAKING, ABINGDON, UK
Bibliographic Reference: REPORT JET-R(87)15, 1987, AVAILABILITY: JET, ABINGDON, UK
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