Development of sweeping detector phase contrast imaging in Large Helical Device

IF 1.3 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION

Journal of Instrumentation Pub Date : 2023-12-01 DOI:10.1088/1748-0221/18/12/C12019

H. Sakai, K. Tanaka, T. Kinoshita

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引用次数: 0

Abstract

Phase contrast imaging (PCI) has been used for the turbulence profile measurement in Large Helical Devices; however, it does not have sufficient spatial resolution owing to the small number of two-dimensional (2D) detector elements. Therefore, in this study, we limited the measurement target to steady-state plasmas and conduct a pseudo multichanneling of a 2D detector array by sweeping using a one-dimensional detector. This new system is called SD-PCI. SD-PCI needs two detectors, one is one-dimensional detector and the other is single channel detector. By selecting suitable detector and imaging magnification for target turbulence or device characteristics, SD-PCI demonstrates the potential capability and enhancements. The wavenumber spectra comparison from the correlation calculations of the simultaneous measurement of the actual plasma with conventional 2D-PCI and proposed SD-PCI shows that SD-PCI is as effective as 2D-PCI in spectral broadening. The simplicity of the proposed system is expected to be applicable to various devices. In this paper, the SD-PCI system was explained along with the initial results of the 2D wavenumber spectrum calculation, which was necessary for obtaining turbulence profile.

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在大型螺旋装置中开发扫描探测器相衬成像技术

相位对比成像（PCI）已被用于大型螺旋设备中的湍流剖面测量；然而，由于二维（2D）探测器元件数量较少，它不具备足够的空间分辨率。因此，在本研究中，我们将测量目标限定为稳态等离子体，并通过使用一维探测器进行扫频，对二维探测器阵列进行伪多通道测量。这种新系统被称为 SD-PCI。SD-PCI 需要两个探测器，一个是一维探测器，另一个是单通道探测器。通过针对目标湍流或设备特性选择合适的探测器和成像倍率，SD-PCI 展示了其潜在的能力和改进。通过相关计算对实际等离子体与传统的 2D-PCI 和拟议的 SD-PCI 同步测量的波长光谱进行比较，结果表明 SD-PCI 在光谱展宽方面与 2D-PCI 一样有效。拟议系统的简易性有望适用于各种设备。本文在解释 SD-PCI 系统的同时，还介绍了二维波谱计算的初步结果，这是获得湍流剖面所必需的。

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.