PPPL-5067

A New Spectrometer Design for the X-ray Spectroscopy of Laser-produced Plasmas with High (sub-ns) Time Resolution

Authors: M. Bitter, K. W. Hill, P. C. Efthimion, L. Delgado-Aparicio, N. Pablant, Jian Lu, P. Beiersdorfer, and Hui Chen

Abstract: This paper describes a new type of x-ray crystal spectrometer, which can be used in combination with gated x-ray detectors to obtain spectra from laser-produced plasmas with a high (sub-ns) time resolution. The spectrometer consists of a convex, spherically bent crystal, which images individual spectral lines as perfectly straight lines across multiple, sequentially gated, strip detectors. Since the Bragg-reflected rays are divergent, the distance between detector and crystal is arbitrary, so that this distance can be appropriately chosen to optimize the experimental arrangement with respect to the detector parameters. The spectrometer concept was verified in proof-of-principle experiments by imaging the Lβ1- and Lβ2-lines of tungsten, at 9.6735 and 9.96150 keV, from a micro-focus xray tube with a tungsten target onto a two-dimensional pixilated Pilatus detector, using a convex, spherically bent Si-422 crystal with a radius of curvature of 500 mm.
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Presented at: The 20th Topical Conference on High-Temperature Plasma Diagnostics, Atlanta, Georgia, June, 2014.

Published in: Review of Scientific Instruments 85, 11D627 (2014); doi: 10.1063/1.4894390
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