Inverse Bremsstrahlung Absorption

被引：17

作者：

Turnbull, D. ^{[1
]}

Katz, J. ^{[1
]}

Sherlock, M. ^{[2
]}

Divol, L. ^{[2
]}

Shaffer, N. R. ^{[1
]}

Strozzi, D. J. ^{[2
]}

Colaitis, A. ^{[3
]}

Edgell, D. H. ^{[1
]}

Follett, R. K. ^{[1
]}

McMillen, K. R. ^{[1
]}

Michel, P. ^{[2
]}

Milder, A. L. ^{[4
]}

Froula, D. H. ^{[1
]}

机构：

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

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[3] Ctr Lasers Intenses & Applicat, F-33400 Talence, France

[4] Univ Alberta, Edmonton, AB T6G 2R3, Canada

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 14期

关键词：

FREE GAUNT FACTOR; COULOMB LOGARITHM; CONDUCTIVITY; EMISSION; FORMULAS;

D O I：

10.1103/PhysRevLett.130.145103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Inverse bremsstrahlung absorption was measured based on transmission through a finite-length plasma that was thoroughly characterized using spatially resolved Thomson scattering. Expected absorption was then calculated using the diagnosed plasma conditions while varying the absorption model components. To match data, it is necessary to account for (i) the Langdon effect; (ii) laser-frequency (rather than plasmafrequency) dependence in the Coulomb logarithm, as is typical of bremsstrahlung theories but not transport theories; and (iii) a correction due to ion screening. Radiation-hydrodynamic simulations of inertial confinement fusion implosions have to date used a Coulomb logarithm from the transport literature and no screening correction. We anticipate that updating the model for collisional absorption will substantially revise our understanding of laser-target coupling for such implosions.

引用

页数：6

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