Enhanced proton beam collimation in the ultra-intense short pulse regime

被引：19

作者：

Green, J. S. ^{[1
]}

Dover, N. P. ^{[2
]}

Borghesi, M. ^{[3
]}

Brenner, C. M. ^{[1
,4
]}

Cameron, F. H. ^{[1
]}

Carroll, D. C. ^{[1
,4
]}

Foster, P. S. ^{[1
,3
]}

Gallegos, P. ^{[1
,4
]}

Gregori, G. ^{[5
]}

McKenna, P. ^{[4
]}

Murphy, C. D. ^{[6
]}

Najmudin, Z. ^{[2
]}

Palmer, C. A. J. ^{[7
]}

Prasad, R. ^{[8
]}

Romagnani, L. ^{[9
]}

Quinn, K. E. ^{[3
]}

Schreiber, J. ^{[10
,11
]}

Streeter, M. J. V. ^{[2
]}

Ter-Avetisyan, S. ^{[12
]}

Tresca, O. ^{[4
]}

Zepf, M. ^{[3
]}

Neely, D. ^{[1
,4
]}

机构：

[1] Rutherford Appleton Lab, STFC, Cent Laser Facil, Didcot OX11 0QX, Oxon, England

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

[3] Queens Univ Belfast, Dept Phys & Astron, Belfast BT7 1NN, Antrim, North Ireland

[4] Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 0NG, Lanark, Scotland

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

[6] Univ Edinburgh, Nucl Phys Grp, Edinburgh EH9 3JZ, Midlothian, Scotland

[7] DESY, Hamburg, Germany

[8] Univ Dusseldorf, Inst Laser & Plasma Phys, D-40225 Dusseldorf, Germany

[9] UPMC, CEA, CNRS, Ecole Polytech,LULI, F-91128 Palaiseau, France

[10] LMU Munchen, Fak Phys, D-85748 Garching, Germany

[11] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[12] Acad Sci Czech Republic, Inst Phys, ELI Beamlines, Prague 18221, Czech Republic

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2014年 / 56卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

laser; plasma; electron; acceleration; proton; ION-ACCELERATION; LASER-PULSES; SCALE LENGTH; PLASMA; TARGETS; DRIVEN;

D O I：

10.1088/0741-3335/56/8/084001

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：

The collimation of proton beams accelerated during ultra-intense laser irradiation of thin aluminum foils was measured experimentally whilst varying laser contrast. Increasing the laser contrast using a double plasma mirror system resulted in a marked decrease in proton beam divergence (20 degrees to <10 degrees), and the enhanced collimation persisted over a wide range of target thicknesses (50 nm-6 mu m), with an increased flux towards thinner targets. Supported by numerical simulation, the larger beam divergence at low contrast is attributed to the presence of a significant plasma scale length on the target front surface. This alters the fast electron generation and injection into the target, affecting the resultant sheath distribution and dynamics at the rear target surface. This result demonstrates that careful control of the laser contrast will be important for future laser-driven ion applications in which control of beam divergence is crucial.

引用

页数：8