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Updated: Jun 6, 2026

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
Published on: August 25, 2016
Observation of alpha particle loss from JET plasmas during ion cyclotron resonance frequency heating using a thin
D S Darrow1, F E Cecil, V Kiptily
1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA. ddarrow@pppl.gov
Abstract:
The loss of MeV alpha particles from JET plasmas has been measured with a set of thin foil Faraday cup detectors during third harmonic heating of helium neutral beam ions. Tail temperatures of ∼ 2 MeV have been observed, with radial scrape off lengths of a few centimeters. Operational experience from this system indicates that such detectors are potentially feasible for future large tokamaks, but careful attention to screening rf and MHD induced noise is essential.
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