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Title: Ionization energy shift of characteristic K x-ray lines from high-Z materials for plasma diagnostics

The energy of the characteristic x-rays emitted by high atomic number atoms in a plasma that contains energetic electrons depends on the atom's ionization. For tungsten, the ionization energy shift of the L-lines has recently been used to diagnose the plasma's ionization; the change in energy of a K-line has been measured for iridium and observed for ytterbium. Here, we present detailed computations of the ionization energy shift to K-lines of these and an additional element, dysprosium; for these atoms, some K-lines nearly coincide in energy with K-edges of slightly lower Z atoms so that a change in transmission behind a K-edge filter betrays a change in energy. The ionization energy shift of such high-energy K-lines may enable a unique diagnostic when the plasma is inside an otherwise opaque enclosure such as hohlraums used on the National Ignition Facility.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5]
  1. Faculty of Chemistry, Nicholas Copernicus University, 87-100 Toruń (Poland)
  2. Ecopulse, Inc., 7844 Vervain Ct, Springfield, Virginia 22152 (United States)
  3. National Centre for Nuclear Research, 05-400 Otwock (Poland)
  4. Artep, Inc., 2922 Excelsior Springs Ct, Ellicott, Maryland 21042 (United States)
  5. Naval Research Laboratory, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
22252020
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATOMIC NUMBER; ATOMS; DYSPROSIUM; IONIZATION; IRIDIUM; PLASMA DIAGNOSTICS; TAIL ELECTRONS; TUNGSTEN; X RADIATION; YTTERBIUM