Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures.

Scientific Reports
C McGuffeyF N Beg

Abstract

Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples, potentially providing an approach for creating samples of warm dense matter with conditions not present on Earth. Envisioned on a larger scale, they could heat fusion fuel to achieve ignition. We have shown in an experiment that a kilojoule-class, multi-picosecond short pulse laser is particularly effective for heating materials. The proton beam can be focussed via target design to achieve exceptionally high flux, important for the applications mentioned. The laser irradiated spherically curved diamond-like-carbon targets with intensity 4 × 1018 W/cm2, producing proton beams with 3 MeV slope temperature. A Cu witness foil was positioned behind the curved target, and the gap between was either empty or spanned with a structure. With a structured target, the total emission of Cu Kα fluorescence was increased 18 fold and the emission profile was consistent with a tightly focussed beam. Transverse proton radiography probed the target with ps order temporal and 10 μm spatial resolution, revealing the fast-acting focussing electric field. Complementary particle-in-cell simulations show h...Continue Reading

References

Feb 15, 2001·Physical Review Letters·M RothH Powell
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Jun 1, 2004·Physical Review Letters·T E CowanN Renard-LeGalloudec
Dec 31, 2005·Physical Review Letters·L RomagnaniO Willi
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Feb 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·B QiaoF N Beg
Apr 19, 2016·Nature Communications·Satyabrata KarMarco Borghesi

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Citations

Jan 30, 2021·Physical Review Letters·Tianhong WangGennady Shvets

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Methods Mentioned

BETA
X-ray

Software Mentioned

LSP
VISRAD
OMEGA

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