Broadband 2D Imaging Spectroscopic Diagnostic

Two-dimensional imaging spectroscopic techniques are powerful tools in diagnosing HED plasmas for measuring spatial distributions of the plasma electron temperature and density. This has been achieved by using arrays of either spherically bent crystals with very high spectral and space resolution but with limited spectral coverage, or pinholes with flat Bragg reflectors with extended spectral coverage but lower resolution. Both methods work optimally for mm-size sources. Our instrument utilizes a convex crystal to produce a 2D image of the x-ray source in each spectral line over a broad spectral range. This instrument is compatible with cm-sized sources, making it an attractive diagnostic for z-pinches or fusion targets. We present measurement techniques established through ray-tracing and measurements made on tabletop x-ray sources to illustrate the spectral coverage and resolution capabilities of this instrument.