Absolute value measurement of ion-scale turbulence by two-dimensional phase contrast imaging in Large Helical 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/c11009

T. Kinoshita, K. Tanaka, H. Sakai, R. Yanai, M. Nunami, C.A. Michael

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引用次数: 0

Abstract

Abstract Absolute value measurements of turbulence amplitude in magnetically confined high-temperature plasmas can effectively explain turbulence-driven transport characteristics and their role in plasma confinements. Two-dimensional phase contrast imaging (2D-PCI) is a technique to evaluate the space-time spectrum of ion-scale electron density fluctuation. However, absolute value measurement of turbulence amplitude has not been conducted owing to the nonlinearity of the detector. In this study, the absolute measurement method proposed in the previous study is applied to turbulence measurement results in the large helical device. As a result, the localized turbulence amplitude at n e = 1.5 × 10 19 m -3 is approximately 3.5 × 10 15 m -3 , which is 0.02% of the electron density. In addition, the evaluated poloidal wavenumber spectrum is almost consistent, within a certain error range, the spectrum being calculated using a nonlinear gyrokinetic simulation. This result is the first to the best of our knowledge to quantitatively evaluate turbulence amplitudes measured by 2D-PCI and compare with simulations.

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大型螺旋装置中离子尺度湍流的二维相衬成像绝对值测量

磁约束高温等离子体湍流幅值的绝对值测量可以有效地解释湍流驱动输运特性及其在等离子体约束中的作用。二维相衬成像(2D-PCI)是一种评价离子尺度电子密度波动时空谱的技术。然而，由于探测器的非线性，湍流幅值的绝对值测量一直没有进行。在本研究中，将前人研究中提出的绝对测量方法应用于大型螺旋装置的湍流测量结果。结果表明，ne = 1.5 × 10 19 m -3处的局部湍流幅值约为3.5 × 10 15 m -3，约为电子密度的0.02%。此外，计算得到的极向波数谱基本一致，在一定误差范围内，采用非线性陀螺动力学模拟计算谱。据我们所知，这是第一次对2D-PCI测量的湍流幅度进行定量评估，并与模拟进行比较。

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.