LHD电子温度波动测量相关ECE系统的研制

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION Journal of Instrumentation Pub Date : 2023-10-01 DOI:10.1088/1748-0221/18/10/c10007
M. Gong, M. Nishiura, R. Yanai, Y. Takemura
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引用次数: 0

摘要

相关性ece (C-ECE)是研究湍流驱动输运的标准方法。这种方法允许包含湍流输运和独立热噪声信息的电子温度波动。湍流特征是从两个近距离位置的相关分析中提取的。利用A - C-ECE系统在大螺旋装置(LHD)上测量了74-79.6 GHz频率范围内的发射。该系统采用光谱去相关方法,作为LHD中的集体汤姆逊散射诊断接收机。C-ECE接收机系统由包含32个带通滤波器的滤波器组系统和工作在12.5 GHz中频(IF)级采样率的快速数字化系统组成。本文介绍了通过C-ECE系统使用相干分析方法获得的LHD温度波动谱的初步实验结果。从中性束注入开始,在磁探针中激发出5khz的MHD模式,并从两个C-ECE接收器系统中获得相干谱。温度波动结果是由去除偏置后的相干谱得出的,表明在0到400 kHz的频率范围内,温度波动水平约为3%。利用C-ECE接收系统,将进一步研究漂移波湍流活动,并重建LHD温度波动的径向分布。
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Development of correlation ECE system for electron temperature fluctuation measurement in LHD
Abstract Correlation-ECE (C-ECE) is a standard method for investigating turbulence driven transport. This method allows electron temperature fluctuations that contain information on turbulent transport and independent thermal noise. The turbulence feature is extracted from a correlation analysis from two close locations. The A C-ECE system is utilized on the large helical device (LHD) to measure emission within the frequency range of 74–79.6 GHz. This system employs the spectral decorrelation method and serves as a collective Thomson scattering diagnostic receiver in the LHD. The C-ECE receiver system is comprised of a filter bank system with 32 band-pass filters and a fast digitizer system operating at a sampling rate of 12.5 GHz in the intermediate frequency (IF) stage. This study presents initial experimental results on temperature fluctuation spectra in the LHD, obtained through the C-ECE system using a coherency-based analysis method. An MHD mode at 5 kHz is excited from the onset of neutral beam injection in a magnetic probe, and coherence spectra are obtained from two C-ECE receiver systems. The temperature fluctuation results are derived from the coherence spectrum after bias removal and indicate a level of approximately 3% in the frequency range of 0 to 400 kHz. Further investigations will be conducted to explore drift wave turbulence activities and reconstruct the radial profile of temperature fluctuation in the LHD using the C-ECE receiver systems.
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来源期刊
Journal of Instrumentation
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.
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