Hot-Electron Temperature and Laser-Light Absorption in Fast Ignition

被引：175

作者：

Haines, M. G. ^{[1
,2
]}

Wei, M. S. ^{[1
]}

Beg, F. N. ^{[1
]}

Stephens, R. B. ^{[3
]}

机构：

[1] Univ Calif San Diego, La Jolla, CA 92093 USA

[2] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[3] Gen Atom Co, San Diego, CA 92186 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.102.045008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experimental data [F. N. Beg , Phys. Plasmas 4, 447 (1997)] indicate that for intense short-pulse laser-solid interactions at intensities up to 5x10(18) W cm(-2) the hot-electron temperature proportional to(I lambda(2))(1/3). A fully relativistic analytic model based on energy and momentum conservation laws for the laser interaction with an overdense plasma is presented here. A general formula for the hot-electron temperature is found that closely agrees with the experimental scaling over the relevant intensity range. This scaling is much lower than ponderomotive scaling. Examination of the electron forward displacement compared to the collisionless skin depth shows that electrons experience only a fraction of a laser-light period before being accelerated forward beyond the laser light's penetration region. Inclusion of backscattered light in a modified model indicates that light absorption approaches 80%-90% for intensity > 10(19) W cm(-2).

引用

页数：4

共 8 条

[1]

Beg FN, 1997, PHYS PLASMAS, V4, P447, DOI 10.1063/1.872103

[2] A Bremsstrahlung spectrometer using k-edge and differential filters with image plate dosimeters [J].

Chen, C. D. ;

King, J. A. ;

Key, M. H. ;

Akli, K. U. ;

Beg, F. N. ;

Chen, H. ;

Freeman, R. R. ;

Link, A. ;

Mackinnon, A. J. ;

MacPhee, A. G. ;

Patel, P. K. ;

Porkolab, M. ;

Stephens, R. B. ;

Van Woerkom, L. D. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2008, 79 (10)

[3]

KHO H, 1983, PHYS REV A, V28, P3156, DOI DOI 10.1103/PHYSREVA.28.3156

[4] Diagnostics for fast ignition science (invited) [J].

MacPhee, A. G. ;

Akli, K. U. ;

Beg, F. N. ;

Chen, C. D. ;

Chen, H. ;

Clarke, R. ;

Hey, D. S. ;

Freeman, R. R. ;

Kemp, A. J. ;

Key, M. H. ;

King, J. A. ;

Le Pape, S. ;

Link, A. ;

Ma, T. Y. ;

Nakamura, H. ;

Offermann, D. T. ;

Ovchinnikov, V. M. ;

Patel, P. K. ;

Phillips, T. W. ;

Stephens, R. B. ;

Town, R. ;

Tsui, Y. Y. ;

Wei, M. S. ;

Van Woerkom, L. D. ;

Mackinnon, A. J. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2008, 79 (10)

[5] Absorption of short laser pulses on solid targets in the ultrarelativistic regime [J].

Ping, Y. ;

Shepherd, R. ;

Lasinski, B. F. ;

Tabak, M. ;

Chen, H. ;

Chung, H. K. ;

Fournier, K. B. ;

Hansen, S. B. ;

Kemp, A. ;

Liedahl, D. A. ;

Widmann, K. ;

Wilks, S. C. ;

Rozmus, W. ;

Sherlock, M. .

PHYSICAL REVIEW LETTERS, 2008, 100 (08)

[6] IGNITION AND HIGH-GAIN WITH ULTRAPOWERFUL LASERS [J].

TABAK, M ;

HAMMER, J ;

GLINSKY, ME ;

KRUER, WL ;

WILKS, SC ;

WOODWORTH, J ;

CAMPBELL, EM ;

PERRY, MD ;

MASON, RJ .

PHYSICS OF PLASMAS, 1994, 1 (05) :1626-1634

[7] Laboratory measurements of 0.7 GG magnetic fields generated during high-intensity laser interactions with dense plasmas [J].

Wagner, U. ;

Tatarakis, M. ;

Gopal, A. ;

Bee, F.N. ;

Clark, E.L. ;

Dangor, A.E. ;

Evans, R.G. ;

Haines, M.G. ;

Mangles, S.P.D. ;

Norreys, P.A. ;

Wei, M.-S. ;

Zepf, M. ;

Krushelnick, K. .

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2004, 70 (2 2) :026401-1

[8] ABSORPTION OF ULTRA-INTENSE LASER-PULSES [J].

WILKS, SC ;

KRUER, WL ;

TABAK, M ;

LANGDON, AB .

PHYSICAL REVIEW LETTERS, 1992, 69 (09) :1383-1386

← 1 →