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Title: Spatial resolution of a spherical x-ray crystal spectrometer at various magnifications

Here, a high spatial resolution of a few μm is often required for probing small-scale high-energy-density plasmas using high resolution x-ray imaging spectroscopy. This resolution can be achieved by adjusting system magnification to overcome the inherent limitation of the detector pixel size. Laboratory experiments on investigating the relation between spatial resolution and system magnification for a spherical crystal spectrometer are presented. Tungsten Lβ 2 rays from a tungsten-target micro-focus x-ray tube were diffracted by a Ge 440 crystal, which was spherically bent to a radius of 223 mm, and imaged onto an x-ray CCD with 13-μm pixel size. The source-to-crystal (p) and crystal-to-detector (q) distances were varied to produce spatial magnifications ( M = q/p) ranging from 2 to 10. The inferred instrumental spatial width reduces with increasing system magnification M. However, the experimental measurement at each M is larger than the theoretical value of pixel size divided by M. Future work will focus on investigating possible broadening mechanisms that limit the spatial resolution.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2] ; ORCiD logo [3]
  1. Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
  2. NRC Kurchatov Institute, Moscow (Russia)
  3. Ecopulse, Inc., Springfield, VA (United States)
Publication Date:
Grant/Contract Number:
AC02-09CH-11466
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21st Topical Conference on High-Temperature Plasma Diagnostics , Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
NRC Kurchatov Institute, Moscow, Russia; Ecopulse, Inc., 7844 Vervain Ct., Springfield, Virginia 22152, USA
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1340074