2D spatially resovled spectroscopy of hed plasmas using a single convex crystal

Abstract

Summary form only given. 2D resolved spectroscopy is an advanced plasma diagnostics tool, providing a method to determine the spatial dependence of plasma parameters (Te, ne). Convex crystal spectrometers are used to record X-ray spectra over wide energy (or wavelength) ranges. Strong source broadening is typical of such spectrometers, which can be dominant over other broadening mechanisms. The physical size of the source can reduce the resolving power (E/ΔE) of such spectrometer down to around 200. Spectra can be spatially resolved in a single dimension by using a slit to create an image of the source. In case of such spectra recorded by convex crystal spectrometers, it is often noted that the shape of the lines themselves, as recorded on a medium, resemble the shape of the plasma source. This provides some crude resolution perpendicular to the spectral line, allowing 2D spatially resolved spectroscopy of the X-ray source. This concept was applied to analyze the time-integrated spectra of Al-Mg wire array Z-pinch implosions on the Zebra generator. The K-shell emission as a function of plasma parameters (density, temperature and plasma thickness) was modeled by the PrismSPECT code. Treating intensity ratios as line ratios, 2D distribution of ne and Te in the pinch was determined.