Abstract
In this paper we report on the results of deuterium and hydrogen experiments in the Sustained Spheromak Physics Experiment (SSPX). We have compared ∼500 deuterium discharges with similar discharges in hydrogen. Typically, we produce H2 plasmas with peak toroidal currents in the range of 0.6MA, electron temperatures (Te) of ∼200eV and energy confinement times (τE) of ∼200μs. The D2 fueled discharges show similar results to those with H2 fueling with no obvious differences in confinement time. Electron temperatures of ∼200 eV with similar electron densities were observed. Both the deuterium and hydrogen fueled discharges have a calculated thermal diffusivity below χe<10m2/s. However, the D2 fueled discharges had a factor of ∼5 increase in high-Z (titanium) impurity content suggesting an increase of physical sputtering. We find no significant mass scaling effects.
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