A new toroidal x-ray crystal spectrometer for the diagnosis of high energy density plasmas at the National Ignition Facility

Journal Article · 10 October 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5036806 · OSTI ID:1480330

Bitter, M. ^[1]; Hill, K. W. ^[1]; Gao, Lan ^[1]; Kraus, B. F.  ^[1]; Efthimion, P. C. ^[1]; Delgado-Aparicio, L. ^[1]; Pablant, N.  ^[1]; Stratton, B. ^[1]; Schneider, M.  ^[2]; Coppari, F. ^[2]; Kauffman, R.  ^[2]; MacPhee, A. G.  ^[2]; Ping, Y. ^[2]; Thorn, D. ^[2]

---

1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The here-described spectrometer was developed for the extended x-ray absorption fine structure spectroscopy of high-density plasmas at the National Ignition Facility. It employs as the Bragg reflecting element a new type of toroidally bent crystal with a constant and very large major radius R and a much smaller, locally varying, minor radius r. Here, the focusing properties of this crystal and the experimental arrangement of the source and detector make it possible to (a) fulfill the conditions for a perfect imaging of an ideal point source for each wavelength, (b) obtain a high photon throughput, (c) obtain a high spectral resolution by eliminating the effects of source-size broadening, and (d) obtain a one-dimensional spatial resolution with a high magnification perpendicular to the main dispersion plane.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• OSTI ID: 1480330
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748
• Publisher: American Institute of Physics (AIP)Copyright Statement
• Country of Publication: United States
• Language: English