Characterization of High-Intensity Laser Propagation in the Relativistic Transparent Regime through Measurements of Energetic Proton Beams

被引：98

作者：

Willingale, L. ^{[1
]}

Nagel, S. R. ^{[1
]}

Thomas, A. G. R. ^{[1
]}

Bellei, C. ^{[1
]}

Clarke, R. J. ^{[2
]}

Dangor, A. E. ^{[1
]}

Heathcote, R. ^{[2
]}

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

Kamperidis, C. ^{[1
]}

Kneip, S. ^{[1
]}

Krushelnick, K. ^{[1
]}

Lopes, N. ^{[3
]}

Mangles, S. P. D. ^{[1
]}

Nazarov, W. ^{[4
]}

Nilson, P. M. ^{[1
]}

Najmudin, Z. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England

[2] Rutherford Appleton Lab, Cent Laser Facil, Chilton OX11 0QX, Oxon, England

[3] Inst Super Tecn, GoLP, Lisbon, Portugal

[4] Univ St Andrews, St Andrews KY16 9ST, Fife, Scotland

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

ION-ACCELERATION; PLASMA; PULSES; ABSORPTION;

D O I：

10.1103/PhysRevLett.102.125002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experiments were performed to investigate the propagation of a high intensity (I similar to 10(21) W cm(-2)) laser in foam targets with densities ranging from 0.9n(c) to 30n(c). Proton acceleration was used to diagnose the interaction. An improvement in proton beam energy and efficiency is observed for the lowest density foam (n(e)=0.9n(c)), compared to higher density foams. Simulations show that the laser beam penetrates deeper into the target due to its relativistic propagation and results in greater collimation of the ensuing hot electrons. This results in the rear surface accelerating electric field being larger, increasing the efficiency of the acceleration. Enhanced collimation of the ions is seen to be due to the self-generated azimuthal magnetic and electric fields at the rear of the target.

引用

页数：4

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