Abstract
In large tokamak devices, such as JET, TFTR, JT‐60U and ITER, a neutron emission profile monitor is considered as one of the principal diagnostic tools, firstly in providing information to characterize the fusion source in terms of its location, shape, intensity and secondly in developing an understanding of fast ion physics in tokamak plasmas. The JET neutron profile monitor is one of the most advanced such instruments currently operating. It enables 2‐D imaging of the non‐circular plasma neutron source through a tomographic deconvolution of line‐integrated measurements. Historically it was usually assumed that the fusion neutron source is a function of the magnetic flux surfaces (MFS), but recent JET results have clearly demonstrated the influence of non‐uniform fast particle populations on the neutron emission profile.Neutron energy spectroscopy also carries valuable information about fast ion behaviour and the fusion and nuclear reactions taking place in the plasma. Spectrum measurements of neutrons w...
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