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

被引：0

作者：

Strehlow, J. ^{[1
]}

Yin, L. ^{[1
]}

Wong, C. -s. ^{[1
]}

Luedtke, S. V. ^{[1
]}

Palaniyappan, S. ^{[1
]}

Stark, D. J. ^{[1
]}

Huang, C. -k. ^{[1
]}

Bogale, A. ^{[2
]}

Cage, B. ^{[3
]}

Coffman, T. A. ^{[1
]}

Bengoa, A. Figueroa ^{[1
]}

Fitzgarrald, R. ^{[4
]}

Mix, L. T. ^{[1
]}

Nedbailo, R. ^{[5
]}

Rusby, D. R. ^{[6
]}

Schmidt, J. L. ^{[1
]}

Twardowski, J. ^{[7
]}

Van Pelt, A. ^{[1
]}

Day, T. H. ^{[1
]}

Jones, B. J. ^{[1
]}

Bruce, S. A. ^{[5
]}

Helal, A. ^{[5
]}

Spinks, M. M. ^{[5
]}

Quevedo, H. J. ^{[5
]}

Beg, F. N. ^{[2
]}

Chowdhury, E. A. ^{[7
]}

Ditmire, T. ^{[5
]}

Liang, E. ^{[3
]}

Thomas, A. G. R. ^{[4
]}

Fernandez, J. C. ^{[1
]}

Gautier, D. C. ^{[1
]}

Hunter, J. ^{[1
]}

Kim, Y. ^{[1
]}

Meaney, K. D. ^{[1
]}

Albright, B. J. ^{[1
]}

机构：

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

[2] Univ Calif San Diego, Ctr Energy Res, La Jolla, CA 92093 USA

[3] Rice Univ, Phys & Astron Dept, Houston, TX 77005 USA

[4] Univ Michigan, Gerard Mourou Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA

[5] Univ Texas Austin, Ctr High Energy Dens Sci, Austin, TX 78712 USA

[6] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[7] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

来源：

PHYSICS OF PLASMAS | 2024年 / 31卷 / 12期

关键词：

ELECTRON; PLASMA; WAVE;

D O I：

10.1063/5.0237193

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：

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 (> 10(18) W cm(-2)) incident on mm-thick metal targets can deliver MeV x-rays via the bremsstrahlung process, providing sources with ultrashort duration ( similar to ps) and small source size (similar to 100 mu m). 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 mu m, important for imaging applications.

引用

页数：10

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