Measurement of Thomson-scattering spectra with continuous angular resolution (invited).

IF 1.3 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION

Review of Scientific Instruments Pub Date : 2024-09-01 DOI:10.1063/5.0219182

J Katz, R Boni, A L Milder, D Nelson, K Daub, D H Froula

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引用次数: 0

Abstract

A novel Thomson-scattering diagnostic with continuous angular resolution over a span of 120° was developed for the characterization of plasmas produced at the Omega Laser Facility. Spectrally resolving light scattered from electron plasma wave features as a function of emission angle provides a means to efficiently probe a large range of plasma frequencies and k vectors. Together, these spectra contain critical constraints on the plasma-physics models used to interpret the data and enable experimental measurements of the electron-velocity distribution function over several orders of magnitude without assumptions about its mathematical form. Major components of the instrument include (1) a reflective collection objective that gathers light over a range of 120° × 12°; (2) a spatial-filter image relay for measurement localization; (3) cylindrical optics for producing a line image of the collection aperture; (4) a transmission grating spectrometer; and (5) a time-gated, image-intensified camera. Thomson-scattered light collected from an ∼50 - μm3 volume of plasma is recorded with 0.8-nm spectral and 1° angular resolution. Initial experiments examined the properties of the electron-velocity distribution in gas-jet-produced plasmas in the presence of heating via inverse bremsstrahlung absorption.

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以连续角度分辨率测量汤姆逊散射光谱（特邀）。

为鉴定欧米茄激光设施产生的等离子体的特性，开发了一种新型汤姆逊散射诊断仪，具有 120° 跨度的连续角度分辨率。通过分辨电子等离子体波特征散射光的光谱与发射角的函数关系，可以有效地探测大范围的等离子体频率和k向量。这些光谱共同包含了对用于解释数据的等离子体物理模型的重要约束，并能够在不假设其数学形式的情况下，对几个数量级的电子速度分布函数进行实验测量。该仪器的主要组成部分包括：(1) 一个反射式收集物镜，收集 120° × 12° 范围内的光线；(2) 用于测量定位的空间滤波图像中继器；(3) 用于产生收集孔线性图像的圆柱形光学器件；(4) 透射光栅光谱仪；(5) 时间门控图像增强照相机。从 ∼50 - μm3 等离子体中收集的汤姆逊散射光以 0.8-nm 光谱和 1° 角度分辨率进行记录。最初的实验研究了在通过反轫致辐射吸收加热的情况下，气体喷射产生的等离子体中电子速度分布的特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Review of Scientific Instruments 工程技术-物理：应用

CiteScore

3.00

自引率

12.50%

发文量

758

审稿时长

2.6 months

期刊介绍： Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.