Determination of hydrogen/deuterium ratio with neutron measurements on MAST

Determination of hydrogen/deuterium ratio with neutron measurements on MAST

Determination of hydrogen/deuterium ratio with neutron measurements on MAST 150 150 Mathew

Determination of hydrogen/deuterium ratio with neutron measurements on MAST

On MAST, compressional Alfven eigenmodes can be destabilized by the presence of a sufficiently large population of energetic particles in the plasma. This dependence was studied in a series of very similar discharges in which increasing amounts of hydrogen were puffed into a deuterium plasma. A simple method to estimate the isotopic ratio nH/nD using neutron emission measurements is here described. The inferred isotopic ratio ranged from 0.0 to 0.6 and no experimental indication of changes in radial profile of nH/nD were observed. These findings are confirmed by TRANSP/NUBEAM simulations of the neutron emission.

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22/07/2014