Abstract
Fully ionized oxygen and carbon in PDX plasmas are detected via charge-exchange recombination reactions between the impurities and hydrogen atoms from a low-power neutral beam. The ${\mathrm{C}}^{6+}$ and ${\mathrm{O}}^{8+}$ ions are observed out to radii beyond the limiter, which is in contrast to expectations based on coronal equilibrium but consistent with a simple diffusive transport model. Central values of ${Z}_{\mathrm{eff}}$ obtained with these measurements agree with values obtained from plasma resistivity and visible bremsstrahlung measurements.
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