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Title: A laser parameter study on enhancing proton generation from microtube foil targets

Journal Article · · Scientific Reports

The interaction of an intense laser with a solid foil target can drive ~ TV/m electric fields, accelerating ions to MeV energies. In this study, we experimentally observe that structured targets can dramatically enhance proton acceleration in the target normal sheath acceleration regime. At the Texas Petawatt Laser facility, we compared proton acceleration from a 1μm flat Ag foil, to a fixed microtube structure 3D printed on the front side of the same foil type. A pulse length (140–450 fs) and intensity ((4–10) ×1020 W/cm2) study found an optimum laser configuration (140 fs, 4 ×1020 W/cm2), in which microtube targets increase the proton cutoff energy by 50% and the yield of highly energetic protons (>10 MeV) by a factor of 8×. When the laser intensity reaches 1021 W/cm2, the prepulse shutters the microtubes with an overcritical plasma, damping their performance. 2D particle-in-cell simulations are performed, with and without the preplasma profile imported, to better understand the coupling of laser energy to the microtube targets. The simulations are in qualitative agreement with the experimental results, and show that the prepulse is necessary to account for when the laser intensity is sufficiently high.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001; NA0003842; NA0003525; SC0021125; 218456; AC52-07NA27344
OSTI ID:
1873935
Alternate ID(s):
OSTI ID: 1876819; OSTI ID: 1882619; OSTI ID: 1888098
Report Number(s):
LA-UR-22-22248; LLNL-JRNL-839884; SAND2022-10269J; 10827; PII: 14881
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 12 Journal Issue: 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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