The nickel density obtained by this technique agrees well with that obtained from the K α line intensity measured with a soft x‐ray spectrometer and that obtained from a bolometric measurement of central radiated power coupled with a coronal equilibrium model of the radiation. ![]() The nickel L‐line cooling rate, calculated with the code, is presented. It also contains basic descriptions and applications of both elements. A computer code, including over 100 nickel L‐line transitions, has been developed to obtain the nickel density. This article contains comparison of key thermal and atomic properties of iron and nickel, two comparable chemical elements from the periodic table. Because the diodes are absolute detectors of radiation, the soft x‐ray emission profile is used to obtain the absolute nickel concentration and density profile in the center of the plasma. Chordal data from the array of diodes are inverted to provide the spatial profile of soft x‐ray emission. When the diode signal is dominated by nickel L‐line emission, the observed signal is considerably larger than the calculated continuum contribution. Nickel is the base element for superalloys. The contribution of the continuum portion of the spectra to the central diode signal can be calculated and compared to the observed signal. An array of soft xray diodes has been used to obtain central nickel densities for discharges in the Doublet III tokamak, during operation with an inconel. Nickel also reduces thermal expansion for better dimensional stability. ![]() The nature of the diode signals is determined primarily by comparison with soft x‐ray spectra.
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