New insights into the laser produced electron-positron pairs

被引：30

作者：

Chen, Hui ^{[1
]}

Nakai, M. ^{[2
]}

Sentoku, Y. ^{[3
]}

Arikawa, Y. ^{[2
]}

Azechi, H. ^{[2
]}

Fujioka, S. ^{[2
]}

Keane, C. ^{[1
]}

Kojima, S. ^{[2
]}

Goldstein, W. ^{[1
]}

Maddox, B. R. ^{[1
]}

Miyanaga, N. ^{[2
]}

Morita, T. ^{[2
]}

Nagai, T. ^{[2
]}

Nishimura, H. ^{[2
]}

Ozaki, T. ^{[2
]}

Park, J. ^{[1
]}

Sakawa, Y. ^{[2
]}

Takabe, H. ^{[2
]}

Williams, G. ^{[1
]}

Zhang, Z. ^{[2
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[2] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan

[3] Univ Nevada, Dept Phys, Reno, NV 89557 USA

来源：

NEW JOURNAL OF PHYSICS | 2013年 / 15卷

关键词：

PLASMA; PARTICLES; CREATION;

D O I：

10.1088/1367-2630/15/6/065010

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report new results from the intense laser target interaction experiment that produces relativistic electron-positron pairs. Laser to electron energy transfer, inferred using x-ray and neutron measurements, was found to be consistent with the measured positrons. To increase the number of positrons, one needs to deliver a greater number of relativistic electrons from the laser-plasma interaction to the high Z gold target. A large preplasma was found to have a negative impact for this purpose, while the laser could produce hotter electrons in such preplasma. The peak energy shift in the positron spectrum is confirmed as the post-acceleration in the sheath potential behind the target. The results were supported by a collisional one-dimensional particle-in-cell code. This experiment was performed using the high-power LFEX laser at the Institute of Laser Engineering at Osaka University using a suite of diagnostics measuring electrons, positrons, x-rays and neutrons from the laser-target interaction at the relativistic regime.

引用

页数：11

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