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This content will become publicly available on August 7, 2019

Title: Experimental considerations to observe two ionizing fronts in systems with a sharp absorption edge

This paper examines the experimental requirements to observe two shock fronts driven by a single x-ray source in systems with a sharp absorption edge. Here, we consider systems where the peak of the x-ray radiation drive coincides with the K-edge of the carbon, which occurs at a photon energy of 284 eV, causing photons to be deposited in two regions. The low-energy photons (E < 284 eV) penetrate further and drive the main shock, while the higher-energy photons (E > 284 eV) are absorbed in the ablated plasma. These higher-energy photons create an ionization front, which then produces a second shock, termed an edge-shock. Using a different radiation-hydrodynamics code and different opacity and equation of state tables, we replicate the previous work and build upon them to explore the conditions required to form the edge shock. We find that having the material K-edge coincide with the spectral domain of the radiation source is necessary but not sufficient on its own to drive the edge-shock.
Authors:
 [1] ;  [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Climate and Space Science and Dept. of Applied Physics
  2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Applied Physics and Dept. of Mechanical Engineering
  3. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Climate and Space Science and Dept. of Applied Physics and Engineering
Publication Date:
Grant/Contract Number:
NA0002956; NA0002719; NA0001944; B614207
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; x-rays; optical properties; interstellar clouds; radiography; hydrodynamics
OSTI Identifier:
1463297