光纤干涉仪在紧凑型托卡马克等离子体高电子密度测量中的应用。

Optical fiber interferometer application for high electron density measurements on compact torus plasmas.

作者信息

Zhang Sen, Chen Chen, Lan Tao, Ding Weixing, Zhuang Ge, Mao Wenzhe, Lan Shijie, Wu Jie, Xu Hangqi, Deng Tijian, Zhu Junfeng, Wu Jiaren, Zu Yiming, Kong Defeng, Zhang Shoubiao, Yao Yuan, Wei Zian, Liu Zixi, Zhou Haiyang, Wang Hai, Wen Xiaohui, Liu Ahdi, Xie Jinlin, Li Hong, Xiao Chijin, Liu Wandong

机构信息

KTX Laboratory and Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China.

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.

出版信息

Rev Sci Instrum. 2020 Jun 1;91(6):063501. doi: 10.1063/5.0005868.

DOI:10.1063/5.0005868

PMID:32611014

Abstract

An optical fiber Mach-Zehnder interferometer at a wavelength of 1.55 µm has been developed for measurements of high electron density on compact torus (CT) plasmas with a high time resolution of 0.1 µs and high phase resolution of 6.4 × 10 rad. To improve density measurement accuracy, the phase noise of the interferometer has been investigated in detail and optimized. In the bench test, the interferometer was calibrated using a piezoelectric ceramic actuator with known stroke. Initial results on CT plasma show that the optical fiber interferometer provides reliable density measurements at two spatial locations and the bulk velocity of plasma can be determined by the method of time of flight.

摘要

已开发出一种波长为1.55 µm的光纤马赫-曾德尔干涉仪，用于测量紧凑型托卡马克（CT）等离子体中的高电子密度，其具有0.1 µs的高时间分辨率和6.4×10 rad的高相位分辨率。为提高密度测量精度，已对干涉仪的相位噪声进行了详细研究并进行了优化。在台架试验中，使用具有已知行程的压电陶瓷致动器对干涉仪进行了校准。CT等离子体的初步结果表明，光纤干涉仪可在两个空间位置提供可靠的密度测量，并且等离子体的整体速度可通过飞行时间法确定。