Initial Results from the New Lost Alpha Diagnostics on JET

Two new devices have been installed in the JET vacuum vessel near the plasma boundary to investigate the loss of energetic ions and fusion products in general and alpha particles in particular during the up coming JET experiments. These devices are (i) a set of multichannel thin foil Faraday collectors and (ii) a well collimated scintillator which is optically connected to a charge coupled device. Initial results, including the radial, energy and poloidal dependence of lost ions from low yield plasmas during the 2005-06 JET restart campaign will be presented.
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EFDC060117 947.71 Kb