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Development of an Experimental Platform for the Investigation of Laser-Plasma Interaction in Conditions Relevant to Shock Ignition Regime.

Review of Scientific Instruments(2022)

Osaka Univ | Univ Bordeaux | INO CNR

Cited 3|Views52
Abstract
The shock ignition (SI) approach to inertial confinement fusion is a promising scheme for achieving energy production by nuclear fusion. SI relies on using a high intensity laser pulse (≈1016 W/cm2, with a duration of several hundred ps) at the end of the fuel compression stage. However, during laser-plasma interaction (LPI), several parametric instabilities, such as stimulated Raman scattering and two plasmon decay, nonlinearly generate hot electrons (HEs). The whole behavior of HE under SI conditions, including their generation, transport, and final absorption, is still unclear and needs further experimental investigation. This paper focuses on the development of an experimental platform for SI-related experiments, which simultaneously makes use of multiple diagnostics to characterize LPI and HE generation, transport, and energy deposition. Such diagnostics include optical spectrometers, streaked optical shadowgraph, an x-ray pinhole camera, a two-dimensional x-ray imager, a Cu Kα line spectrometer, two hot-electron spectrometers, a hard x-ray (bremsstrahlung) detector, and a streaked optical pyrometer. Diagnostics successfully operated simultaneously in single-shot mode, revealing the features of HEs under SI-relevant conditions.
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要点】:本研究开发了一个实验平台,用于在冲击点火(SI)条件下研究激光等离子体相互作用,其创新点在于集成了多种诊断工具来表征激光等离子体相互作用和热电子生成、传输及能量沉积的过程。

方法】:研究采用了一系列诊断工具,包括光学光谱仪、拉伸光阴影图、X射线孔径相机、二维X射线成像仪、Cu Kα线光谱仪、两个热电子光谱仪、硬X射线(制动辐射)检测器以及拉伸光体温计。

实验】:实验平台能够在单次拍摄模式下成功运行多种诊断工具,揭示了在SI相关条件下热电子的特征。