Suprathermal electron production in laser-irradiated Cu targets characterized by combined methods of x-ray imaging and spectroscopy

被引：28

作者：

Renner, O. ^{[1
]}

Smid, M. ^{[1
]}

Batani, D. ^{[2
]}

Antonelli, L. ^{[2
,3
,4
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221, Czech Republic

[2] Univ Bordeaux, CNRS, CEA, CELIA,UMR 5107, F-33405 Talence, France

[3] Univ Roma Tor Vergata, Dip Ingn Ind, Rome, Italy

[4] Univ Roma La Sapienza, Dipartimento SBAI, Piazzale Aldo Moro 5, I-00185 Rome, Italy

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2016年 / 58卷 / 07期

关键词：

laser-plasma interaction; inertial confinement fusion; suprathermal electron generation; x-ray plasma diagnostics; HOT-ELECTRONS; PRE-PLASMA; EMISSION; INTENSITY; CRYSTALS;

D O I：

10.1088/0741-3335/58/7/075007

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：

In a series of experiments performed with laser-irradiated planar targets at the PALS laser facility, the generation of suprathermal electrons has been studied at conditions relevant for the development of a shock ignition approach to inertial confinement fusion. A simultaneous application of high-collection-efficiency K-shell imaging with high resolution x-ray spectroscopy offers a novel approach to hot electron diagnosis at non-coated or moderately coated, medium-atomic-number targets, where the contribution of suprathermal-electron-generated, frequency-shifted K alpha emission from highly ionized atoms cannot be neglected. Based on experimental data provided by these combined techniques and their interpretation via collisional-radiative atomic codes and Monte Carlo modeling of hot electron energy deposition in heated Cu targets, the fraction of the energy converted to hot electrons at laser intensities approximate to 10(16) W cm(-2) was measured to be at the level of 0.1-0.8%. The higher values of conversion efficiency found for frequency tripled radiation support a theoretical conjecture of enhanced laser energy absorption by a resonance mechanism and its transport to a flow of fast electrons.

引用

页数：8

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