INVESTIGATIONS ON CALIBRATION SOURCES FOR SOFT-X-RAY PLASMA SPECTROSCOPY AND IMPURITY MONITORS

For absolute soft-x-ray line intensity measurements to deduce elementa l concentrations and parameters of magnetically confined plasmas large -area x-ray sources are developed and investigated. These calibration sources use K, L, and M transitions in different elements and cover a wide photon energy (and wavelength) range. From the measured absolute line intensities of these sources the quantum efficiency values of num erous elements for K-, L-, and M-line emission per incident electron a re deduced. They represent the basis of simple soft-x-ray monitors for impurities in fusion plasmas. (C) 1996 American Institute of Physics.