Physics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rsci...77jf330s&link_type=abstract
Review of Scientific Instruments, Volume 77, Issue 10, pp. 10F330-10F330-5 (2006).
Physics
1
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.
Delgado-Aparicio L.
Finkenthal Michael
Johnson Dennis
Kaita R.
Kugel H.
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