Abstract
In order to measure the radiation losses of a theta pinch plasma (electron densityne=1−5×1016 cm−3, electron temperatureTe=150−350 eV), a grazing incidence spectrograph is absolutely calibrated in the range 10–200 A. This is done in two steps: First the measured intensity ratios of lines emitted by hydrogen-like ions are compared with their calculated values thus yielding the relative sensitivity of the instrument. The result is confirmed by incorporating well known intensity ratios of lithium-like ions. Secondly absolute calibration is possible by hanging the spectrograph on an absolutely calibrated monochromator via the branching-ratios of lithium-like ions.
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