The effects of wall temperature on light impurity concentrations in the Alcator tokamak were measured spectroscopically. The results show that the temperature reduction decreases the influx of oxygen by a factor of 4–5 in normal tokamak operation when the wall temperature dropped from 450 to 77 K but does not affect the other light impurities (N,C).
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Marmar et al. (1979) studied this question.
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