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This article reports on the application of the minor branch of the D–T reaction, D2 +T3 =He5 +γ(16.7 MeV), as a diagnostic vehicle to determine the cross-sectional distribution of fusion reactions in a D–T burning plasma. Arrays of scintillation detectors, located circumferentially about the plasma, outside the reaction chamber, obtain line-integrated values of gamma-ray production along chords through the chamber. Tomographic techniques will be used to reconstruct the reacting profiles. A description of the tomographic system and reconstruction examples are presented.

A fairly compact mass spectrometer suitable for vacuum use, and requiring no cooling, was built utilizing permanent magnets. A uniform, variable magnetic field, with a maximum of 2800 G, was produced in a 0.6-cm-wide gap by using a rotating block of samarium–cobalt permanent magnets, and an iron yoke assembly.