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MeV x-ray production from a petawatt laser in the regime of a relativistically transparent preplasma, with applications to radiography

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0237193· OSTI ID:2482579
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  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. University of California, San Diego, CA (United States)
  3. Rice University, Houston, TX (United States)
  4. University of Michigan, Ann Arbor, MI (United States)
  5. University of Texas, Austin, TX (United States)
  6. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  7. The Ohio State University, Columbus, OH (United States)
Bright sources of mega-electron volt (MeV) x-rays have many unique applications, including nuclear physics, radiation oncology, and imaging high areal density systems. High intensity lasers (>1018 W cm-2) incident on mm-thick metal targets can deliver MeV x-rays via the bremsstrahlung process, providing sources with ultrashort duration (~ps) and small source size (~100 μm). Here, we report on a reproducible regime of laser-driven MeV x-ray sources, where the x-ray dose can be further increased by 60% by coating the metal target with micrometers of plastic. High fidelity numerical simulations indicate that the interaction is a result of relativistic transparency in the preplasma. Though relativistic transparency is present in both cases, the greater sound speed and smaller ion inertia of the plastic target allow the laser to more deeply penetrate and couple more efficiently to electrons. Radiography with this system demonstrates a resolving power < 300 μm, important for imaging applications.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
89233218CNA000001; SC0021125
OSTI ID:
2482579
Alternate ID(s):
OSTI ID: 2532375
Report Number(s):
LA-UR--24-24598
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 31; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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