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- W2019965647 abstract "Densities of C, O, and Si impurities during the steady-state portion of Alcator-C discharges have been computed from spectroscopic measurements of the absolute brightnesses of visible and uv emission lines in combination with a one-dimensional transport calculation which models the charge-state and emissivity profiles. Profiles of all the charge states of a particular impurity were calculated by utilizing independent measurements of plasma density and temperature and by solving the coupled system of transport and rate equations connecting the ionization states. These profiles were then used to calculate emissivity profiles by solving the matrix equation relating the level populations through collisional excitation, collisional deexcitation, spontaneous emission, inner-shell ionization, and cascades from upper levels. Three different types of limiters (molybdenum, graphite, and SiC-coated graphite) have been used on the Alcator-C. It was observed that the principal impurities in the plasma, under most conditions, were determined by the type of limiter material being used. However, the source of the impurities could be either the wall or the limiters, since it has been shown that the wall becomes coated with limiter material. A significant influx of impurities directly from the limiters was often seen during the application of lower-hybrid-frequency rf power to the plasma." @default.
- W2019965647 created "2016-06-24" @default.
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- W2019965647 date "1985-05-01" @default.
- W2019965647 modified "2023-09-28" @default.
- W2019965647 title "Impurity-density calculations from spectroscopic measurements of visible and uv line emission on the Alcator-<i>C</i>tokamak" @default.
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- W2019965647 doi "https://doi.org/10.1103/physreva.31.3291" @default.
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