HE-LIKE IONS ARE OF PARTICULAR INTEREST IN TOKAMAK IMPURITY RESEARCH BECAUSE OF THEIR DOMINANCE OVER LARGE TEMPERATURE RANGES.

HE-LIKE IONS ARE OF PARTICULAR INTEREST IN TOKAMAK IMPURITY RESEARCH BECAUSE OF THEIR DOMINANCE OVER LARGE TEMPERATURE RANGES. ABSOLUTE DENSITY MEASUREMENTS OF THESE IONS AS A FUNCTION OF TIME AND SPACE ARE ESSENTIAL. WE THEREFORE PROPOSE TO CONSTRUCT A CRYSTAL SPECTROMETER THAT WILL RECORDSPATIALLY AND TEMPORALLY RESOLVED EMISSION FROM 1S-2P TRANSITIONS IN HE-LIKE AND OTHER HIGHLY IONIZED IONS. THE SPECTROMETER WILL BE ABLE TO SIMULTANEOUSLY ACQUIRE SPECTRA FROM EITHER SEVERAL ELEMENTS OR SEVERAL TANGENTIAL CORDS, A SIGNIFICANT EXTENSION OF THE STATE OF THE ART. IT WILL BE USED ON TEXT, OR ON A DIFFERENT TOKAMAK THAT DOE MAY FIND MORE APPROPRIATE, TO PERFORM EXTENSIVE TRANSPORT AND ATOMIC PHYSICS STUDIES ON NATURALLY OCCURING AND INJECTED IMPURITIES. SPATIALLY AND TEMPORALLY RESOLVED MEASUREMENTS OF THE ION AND ELECTRON TEMPERATUES, ABSOLUTE ION DENSITIES, DISTRIBUTION OF IONIZATION STAGES, AND DEVIATION FROM IONIZATION EQUILIBRIUM WILL BE OBTAINED. THE TRANSPORTVELOCITIES, THE DIELECTRONIC RECOMBINATION RATE OF THE HE-LIKE IONIZATION STAGE, AND SCALING INFORMATION REGARDING COLLISIONAL IONIZATION AND EXCITATION RATES WILL ALSO BE DETERMINED. THESE MEASUREMENTS REPRESENT A SUBSTANTIAL EXTENSION OF THE MEASURED DATA BASE REGARDING ATOMIC PHYSICSAND TRANSPORT OF TOKAMAK IMPURITIES. IN PHASE I WE WILL DESIGN THE SPECTROMETER AND CALCULATE THE ANTICIPATED SPECTRA. IN PHASE II WE WILL CONSTRUCT, INSTALL, AND TEST THE SPECTROMETER ON TEXT AND PERFORM EXTENSIVE ATOMIC PHYSICS AND TRANSPORT MEASUREMENTS.