High throughput measurements of soft x-ray impurity emission using a multilayer mirror telescope

Physics

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Optical Measurements, Emission, Absorption, And Scattering Of Electromagnetic Radiation, Impurities In Plasmas, Tokamaks, Spherical Tokamaks, Plasma Turbulence, Fluctuation And Chaos Phenomena

Scientific paper

A 4 in. multilayer mirror telescope has been tested on National Spherical Torus Experiment (NSTX) for high throughput measurements of the beam excited soft x-ray impurity emission. The design is aimed at imaging low-k turbulent fluctuations in the plasma core. The test device used curved and planar Mo/Si mirrors to focus with ~15% optical transmission and few angstrom bandwidths, the 135 A˚ Lyα line from injected Li III atoms, or the n=2-4 line from intrinsic C VI ions. As test detectors we used 1 cm2 absolute extreme ultraviolet diodes, equipped with 400 kHz bandwidth, low noise preamplifiers. With the available view on NSTX the telescope successfully detected small impurity density fluctuations associated with 1/1 modes rotating at midradius, indicating that a high signal to noise ratio and cost effective core turbulence diagnostic is feasible based on this concept.

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