Relativistic Quasimonoenergetic Positron Jets from Intense Laser-Solid Interactions

被引：309

作者：

Chen, Hui ^{[1
]}

Wilks, S. C. ^{[1
]}

Meyerhofer, D. D. ^{[2
,3
]}

Bonlie, J. ^{[1
]}

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

Chen, S. N. ^{[1
]}

Courtois, C. ^{[4
]}

Elberson, L. ^{[1
]}

Gregori, G. ^{[5
]}

Kruer, W. ^{[1
]}

Landoas, O. ^{[4
]}

Mithen, J. ^{[5
]}

Myatt, J. ^{[2
]}

Murphy, C. D. ^{[5
]}

Nilson, P. ^{[2
]}

Price, D. ^{[1
]}

Schneider, M. ^{[1
]}

Shepherd, R. ^{[1
]}

Stoeckl, C. ^{[2
]}

Tabak, M. ^{[1
]}

Tommasini, R. ^{[1
]}

Beiersdorfer, P. ^{[1
]}

机构：

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

[2] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA

[3] Univ Rochester, Dept Mech Engn & Phys, Rochester, NY 14623 USA

[4] DIF, CEA, DAM, F-91297 Arpajon, France

[5] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

PAIR PRODUCTION; ELECTRON; BEAMS; ANNIHILATION; PULSES; PHOTON;

D O I：

10.1103/PhysRevLett.105.015003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Detailed angle and energy resolved measurements of positrons ejected from the back of a gold target that was irradiated with an intense picosecond duration laser pulse reveal that the positrons are ejected in a collimated relativistic jet. The laser-positron energy conversion efficiency is similar to 2 X 10(-4). The jets have similar to 20 degree angular divergence and the energy distributions are quasimonoenergetic with energy of 4 to 20 MeV and a beam temperature of similar to 1 MeV. The sheath electric field on the surface of the target is shown to determine the positron energy. The positron angular and energy distribution is controlled by varying the sheath field, through the laser conditions and target geometry.

引用

页数：4

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