CO2-laser Interferometer on the Large Helical Device

IF 2.1 4区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Journal of Fusion Energy Pub Date : 2026-05-05 DOI:10.1007/s10894-026-00570-2

Kenji Tanaka, Tsuyoshi Akiyama, Toshiki Kinoshita, Hikona Sakai, Yuki Takemura, Hikaru Okuwada, Akira Uritani, Clive Michael

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Abstract

This study reports the development of \(\hbox {CO}_2\) laser interferometers for electron density measurements on the large helical device (LHD). Two types of interferometers using approximately 10 \(\mu m\) are developed. One is an imaging two-color laser interferometer (I-TCI) for measuring density profiles and macroscopic fluctuations of MHD instabilities, and the other is a single channel phase-modulated dispersion interferometer (PMDI) designed for reliable density monitoring. The diagnostic principles, systems, and analysis techniques are outlined, and representative measurement results are presented. The I-TCI system was also designed to operate in the deuterium experiments performed on LHD from 2017 until 2022. Shielding against neutron and \(\gamma\)-ray irradiation was necessary to prevent damage to the I-TCI detection system. Design strategies for neutron and \(\gamma\)-ray shielding are presented in the appendices.

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大螺旋装置上的co2激光干涉仪

本文报道了在大螺旋装置（LHD）上测量电子密度的\(\hbox {CO}_2\)激光干涉仪的研制。两种类型的干涉仪使用大约10 \(\mu m\)被开发。一种是成像双色激光干涉仪（I-TCI），用于测量密度分布和MHD不稳定性的宏观波动，另一种是单通道相位调制色散干涉仪（PMDI），用于可靠的密度监测。概述了诊断原理、系统和分析技术，并给出了具有代表性的测量结果。I-TCI系统还被设计用于从2017年到2022年在LHD上进行的氘实验。对中子和\(\gamma\)射线的屏蔽是必要的，以防止对I-TCI探测系统的损坏。附录中介绍了中子和\(\gamma\)射线屏蔽的设计策略。

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 Fusion Energy 工程技术-核科学技术

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

2.3 months

期刊介绍： The Journal of Fusion Energy features original research contributions and review papers examining and the development and enhancing the knowledge base of thermonuclear fusion as a potential power source. It is designed to serve as a journal of record for the publication of original research results in fundamental and applied physics, applied science and technological development. The journal publishes qualified papers based on peer reviews. This journal also provides a forum for discussing broader policies and strategies that have played, and will continue to play, a crucial role in fusion programs. In keeping with this theme, readers will find articles covering an array of important matters concerning strategy and program direction.