http://www-pub.iaea.org/MTCD/publicatio ... s/IT14.htm
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There is more.An overview of g-ray diagnostic observations of fast a-particles and He-ions in JET is presented and capabilities of this diagnostics in ITER are discussed. The talk will cover the following points: 1) An introduction to the physics of the used alpha-particle diagnosis, which based on measurements of the g-ray emission from the 9Be(a,ng)12C nuclear reaction. 2) A description of the experimental equipment used for the measurements, in particularly, g-ray spectrometers and 2-D gamma cameras. 3) First measurements of g-ray spectra from nuclear reactions between fusion-born a particles and Be impurities, which were done in JET D-majority plasmas just after short blips of T-NBI. In the performed experiments the time dependence of the measured spectra allowed the determination of the density evolution of alphas, and in this way a correlation between the g-ray emission decay and plasma parameters in different plasma scenarios was established.