Stray light suppression for Thomson scattering diagnostic on linear magnetized plasma device

IF 1.3 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION

Journal of Instrumentation Pub Date : 2023-11-01 DOI:10.1088/1748-0221/18/11/c11002

Zhiyi Lin, Jinlin Xie, Qiaofeng Zhang, Mengmeng Xu, Qingbin Zeng

引用次数: 0

Abstract

Abstract In Thomson scattering (TS) diagnostic system, the stray light greatly affects the signal-to-noise ratio (SNR). The suppression issue is particularly severe for the low density and low temperature plasma due to very few scattered photons and narrow line broadening. The traditional methods, such as Brewster window, beam dump and transmission pipe with black-coated internal surface, have been adopted in the stray light suppression system on our Linear Magnetized Plasma (LMP) device. Moreover, an assembly of tapered apertures are placed in the optical path. Via numerical simulation, the optimal configuration of the adjustable aperture tube (size, location, and orientation) that provide the best suppression has been found. Numerical results show that the optimal aperture group with 6 mm and 8 mm tapered apertures can maintain over 97% transmission rate of the main laser energy while reducing stray light by 99.6%.

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线性磁化等离子体器件汤姆逊散射诊断中的杂散光抑制

摘要在汤姆逊散射(TS)诊断系统中，杂散光对系统的信噪比影响很大。对于低密度低温等离子体，由于散射光子很少，线展宽窄，抑制问题尤其严重。在线性磁化等离子体(LMP)器件杂散光抑制系统中，采用了布鲁斯特窗、光束转储和内表面涂黑的传输管等传统方法。此外，在光路中放置了锥形孔径的组件。通过数值模拟，找到了具有最佳抑制效果的可调孔径管的最佳配置(尺寸、位置和方向)。数值计算结果表明，6 mm和8 mm锥形孔径的最优孔径组可使主激光能量的透过率保持在97%以上，同时使杂散光减少99.6%。

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

Journal of Instrumentation 工程技术-仪器仪表

CiteScore

2.40

自引率

15.40%

发文量

827

审稿时长

7.5 months

期刊介绍： Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include. -Accelerators: concepts, modelling, simulations and sources- Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons- Detector physics: concepts, processes, methods, modelling and simulations- Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics- Instrumentation and methods for plasma research- Methods and apparatus for astronomy and astrophysics- Detectors, methods and apparatus for biomedical applications, life sciences and material research- Instrumentation and techniques for medical imaging, diagnostics and therapy- Instrumentation and techniques for dosimetry, monitoring and radiation damage- Detectors, instrumentation and methods for non-destructive tests (NDT)- Detector readout concepts, electronics and data acquisition methods- Algorithms, software and data reduction methods- Materials and associated technologies, etc.- Engineering and technical issues. JINST also includes a section dedicated to technical reports and instrumentation theses.