A tabletop, ultrashort pulse photoneutron source driven by electrons from laser wakefield acceleration

被引：24

作者：

Jiao, X. J. ^{[1
]}

Shaw, J. M. ^{[1
]}

Wang, T. ^{[1
]}

Wang, X. M. ^{[1
]}

Tsai, H. ^{[1
]}

Poth, P. ^{[2
]}

Pomerantz, I. ^{[1
,3
]}

Labun, L. A. ^{[1
]}

Toncian, T. ^{[1
]}

Downer, M. C. ^{[1
]}

Hegelich, B. M. ^{[1
]}

机构：

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

[2] Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany

[3] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

来源：

MATTER AND RADIATION AT EXTREMES | 2017年 / 2卷 / 06期

关键词：

Neutron source; LWFA; Photoneutron reaction; PLASMA;

D O I：

10.1016/j.mre.2017.10.003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Relativistic electron beams driven by laser wakefield acceleration were utilized to produce ultrashort neutron sources. The experiment was carried out on the 38 fs, similar to 0.5 J, 800 nm Ti:Sapphire laser in the 10 TW UT3 laser lab at University of Texas at Austin. The target gas was a high density pulsed gas jet composed of 90% He and 10% N-2. The laser pulse with a peak intensity of 1.5 x 10(18) W/cm(2) interacted with the target to create a cylindrical plasma channel of 60 mu m radius (FWHM) and 1.5 mm length (FWHM). Electron beams of similar to 80 pC with the Gaussian energy distribution centered at 37 MeV and a width of 30 MeV (FWHM) were produced via laser wakefield acceleration. Neutron fluences of similar to 2.4 x 10(6) per shot with hundreds of ps temporal length were generated through bremsstrahlung and subsequent photoneutron reactions in a 26.6 mm thick tungsten converter. Results were compared with those of simulations using EPOCH and GEANT4, showing agreement in electron spectrum, neutron fluence, neutron angular distribution and conversion rate. (C) 2017 Science and Technology Information Center, China Academy of Engineering Physics. Publishing services by Elsevier B.V.

引用

页码：296 / 302

页数：7

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