Initial Results from Ion Temperature Profile Deconvolution in Compact Tori

Data from single chord Doppler ion temperature measurements in spheromaks have been analyzed with the aid of a one dimensional equilibrium charge state transport code. With electron temperature profiles known from Thomson scattering and estimates for transport rates, we can determine the radial location for the impurity line emission. The results of these analyses are the reconstruction of one dimensional ion temperature profiles. From this T_i profile data we can now correctly calculate volume averaged confinement quantities. Our initial findings are that previously quoted values of ⟨β⟩ and ⟨τ_E⟩ were underestimated by a factor of ∼ 4 and now the highest quoted energy confinement times are ∼ 50µs.