Laser-plasmas in the relativistic-transparency regime: Science and applications

被引：62

作者：

Fernandez, Juan C. ^{[1
]}

Gautier, D. Cort ^{[1
]}

Huang, Chengkung ^{[1
]}

Palaniyappan, Sasikumar ^{[1
]}

Albright, Brian J. ^{[1
]}

Bang, Woosuk ^{[1
,2
]}

Dyer, Gilliss ^{[3
]}

Favalli, Andrea ^{[1
]}

Hunter, James F. ^{[1
]}

Mendez, Jacob ^{[1
]}

Roth, Markus ^{[4
]}

Swinhoe, Martyn ^{[1
]}

Bradley, Paul A. ^{[1
]}

Deppert, Oliver ^{[4
]}

Espy, Michelle ^{[1
]}

Falk, Katerina ^{[5
]}

Guler, Nevzat ^{[1
,6
]}

Hamilton, Christopher ^{[1
]}

Hegelich, Bjorn Manuel ^{[3
]}

Henzlova, Daniela ^{[1
]}

Ianakiev, Kiril D. ^{[1
]}

Iliev, Metodi ^{[1
]}

Johnson, Randall P. ^{[1
]}

Kleinschmidt, Annika ^{[4
]}

Losko, Adrian S. ^{[1
]}

McCary, Edward ^{[3
]}

Mocko, Michal ^{[1
]}

Nelson, Ronald O. ^{[1
]}

Roycroft, Rebecca ^{[3
]}

Cordoba, Miguel A. Santiago ^{[1
]}

Schanz, Victor A. ^{[4
]}

Schaumann, Gabriel ^{[4
]}

Schmidt, Derek W. ^{[1
]}

Sefkow, Adam ^{[7
,8
]}

Shimada, Tsutomu ^{[1
]}

Taddeucci, Terry N. ^{[1
]}

Tebartz, Alexandra ^{[4
]}

Vogel, Sven C. ^{[1
]}

Vold, Erik ^{[1
]}

Wurden, Glen A. ^{[1
]}

Yin, Lin ^{[1
]}

机构：

[1] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA

[2] GIST, Dept Phys & Photon Sci, Gwangju 61005, South Korea

[3] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[4] Tech Univ Darmstadt, Inst Nucl Phys, D-64289 Darmstadt, Germany

[5] ASCR, Inst Phys, ELI Beamlines, Prague 18221 8, Czech Republic

[6] Spectral Sci, 4 Fourth Ave, Burlington, MA 01803 USA

[7] Lab Laser Energet, Rochester, NY 14623 USA

[8] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

来源：

PHYSICS OF PLASMAS | 2017年 / 24卷 / 05期

关键词：

ION-ACCELERATION; PROTON-BEAMS; DRIVEN; CONTRAST; RADIATION; EXPANSION; ELECTRON; FACILITY; PHOTON; FOILS;

D O I：

10.1063/1.4983991

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Laser-plasma interactions in the novel regime of relativistically induced transparency (RIT) have been harnessed to generate intense ion beams efficiently with average energies exceeding 10MeV/nucleon (> 100MeV for protons) at " table-top" scales in experiments at the LANL Trident Laser. By further optimization of the laser and target, the RIT regime has been extended into a self-organized plasma mode. This mode yields an ion beam with much narrower energy spread while maintaining high ion energy and conversion efficiency. This mode involves self-generation of persistent high magnetic fields (similar to 10(4) T, according to particle-in-cell simulations of the experiments) at the rear-side of the plasma. These magnetic fields trap the laser-heated multi-MeV electrons, which generate a high localized electrostatic field (similar to 0.1 TV/m). After the laser exits the plasma, this electric field acts on a highly structured ion-beam distribution in phase space to reduce the energy spread, thus separating acceleration and energy-spread reduction. Thus, ion beams with narrow energy peaks at up to 18MeV/nucleon are generated reproducibly with high efficiency (approximate to 5%). The experimental demonstration has been done with 0.12 PW, high-contrast, 0.6 ps Gaussian 1.053 mu m laser pulses irradiating planar foils up to 250 nm thick at 2-8 x 10(20) W/cm(2). These ion beams with co-propagating electrons have been used on Trident for uniform volumetric isochoric heating to generate and study warm-dense matter at high densities. These beam plasmas have been directed also at a thick Ta disk to generate a directed, intense point-like Bremsstrahlung source of photons peaked at similar to 2MeV and used it for point projection radiography of thick high density objects. In addition, prior work on the intense neutron beam driven by an intense deuterium beam generated in the RIT regime has been extended. Neutron spectral control by means of a flexible converter-disk design has been demonstrated, and the neutron beam has been used for point-projection imaging of thick objects. The plans and prospects for further improvements and applications are also discussed. (C) 2017 Author(s).

引用

页数：19

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