Abstract
The edge plasma and impurity content of the ZT-40M reversed-field pinch during operation without limiters are characterized using silicon collector probes. After exposure to a number of deuterium discharges, analysis of the probe samples yields information about both the ion temperature and the impurity flux. Deuterium retention and depth profile measurements show that the charge-exchange outflux from ZT-40M consists of two components: a large 50 eV component and a smaller, energetic component corresponding to an ion temperature of ≈ 400 eV. Measured deposits of nickel, chromium, iron, and molybdenum atoms, which are the main constituents of the Inconel 625 liner, indicate that the flux of metal atoms is 1–2% of the total deuterium outflux.
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