Recent fast electron energy transport experiments relevant to fast ignition inertial fusion

被引：29

作者：

Norreys, P. A. ^{[1
,2
]}

Scott, R. H. H. ^{[1
,2
]}

Lancaster, K. L. ^{[1
]}

Green, J. S. ^{[1
,2
]}

Robinson, A. P. L. ^{[1
]}

Sherlock, M. ^{[1
]}

Evans, R. G. ^{[2
]}

Haines, M. G. ^{[2
]}

Kar, S.

Zepf, M. ^{[3
]}

Key, M. H. ^{[4
]}

King, J. ^{[5
]}

Ma, T. ^{[5
]}

Yabuuchi, T. ^{[5
]}

Wei, M. S. ^{[5
]}

Beg, F. N. ^{[5
]}

Nilson, P. ^{[6
]}

Theobald, W. ^{[6
]}

Stephens, R. B. ^{[7
]}

Valente, J. ^{[8
]}

Davies, J. R. ^{[8
]}

Takeda, K. ^{[9
]}

Azechi, H. ^{[9
]}

Nakatsutsumi, M. ^{[10
]}

Tanimoto, T. ^{[10
]}

Kodama, R. ^{[9
,10
]}

Tanaka, K. A. ^{[10
]}

机构：

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

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

[3] Queens Univ Belfast, Belfast BT7 1NN, Antrim, North Ireland

[4] Lawrence Livermore Natl Lab, Livermore, CA USA

[5] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA

[6] Univ Rochester, Laser Energet Lab, Rochester, NY USA

[7] Gen Atom Corp, San Diego, CA 92186 USA

[8] Inst Plasmas, Grp Lasers & Plasmas, P-1049001 Lisbon, Portugal

[9] Osaka Univ, Inst Laser Engn, Suita, Osaka 565, Japan

[10] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

来源：

NUCLEAR FUSION | 2009年 / 49卷 / 10期

基金：

英国工程与自然科学研究理事会; 日本科学技术振兴机构;

关键词：

LASER-SOLID INTERACTIONS; PLASMA INTERACTIONS; VULCAN PETAWATT; HIGH-GAIN; FACILITY; TARGETS; ACCELERATION; CHANNELS; DENSITY; PULSES;

D O I：

10.1088/0029-5515/49/10/104023

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：

A number of experiments have been undertaken at the Rutherford Appleton Laboratory that were designed to investigate the physics of fast electron transport relevant to fast ignition inertial fusion. The laser, operating at a wavelength of 1054 nm, provided pulses of up to 350 J of energy on target in a duration that varied in the range 0.5-5 ps and a focused intensity of up to 10(21) W cm(-2). A dependence of the divergence of the fast electron beam with intensity on target has been identified for the first time. This dependence is reproduced in two-dimensional particle-in-cell simulations and has been found to be an intrinsic property of the laser-plasma interaction. A number of ideas to control the divergence of the fast electron beam are described. The fractional energy transfer to the fast electron beam has been obtained from calibrated, time-resolved, target rear-surface radiation temperature measurements. It is in the range 15-30%, increasing with incident laser energy on target. The fast electron temperature has been measured to be lower than the ponderomotive potential energy and is well described by Haines' relativistic absorption model.

引用

页数：8

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