Application of Digital Phase Analysis to Far-Infrared Laser Interferometer for the Large Helical Device

被引：0

作者：

Sakai H. ^{[1
]}

Tanaka K. ^{[1
,2
]}

Takemura Y. ^{[2
,3
]}

Ito Y. ^{[2
]}

Tokuzawa T. ^{[2
,3
]}

Yasuhara R. ^{[2
,3
]}

Uehara H. ^{[2
,3
]}

Kinoshita T. ^{[1
]}

Akiyama T. ^{[2
,5
]}

Nakayama K. ^{[4
]}

Kawahata K. ^{[2
]}

机构：

[1] Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Kasuga

[2] National Institute for Fusion Science, Gifu, Toki

[3] The Graduate University for Advanced Studies, Gifu, Toki

[4] College of Engineering, Chubu University, Aichi, Kasugai

[5] General Atomics, P. O. Box 85068, San Diego, 92186-9784, CA

来源：

Plasma and Fusion Research | 2023年 / 18卷

关键词：

digital demodulation; far-infrared laser; interferometer; plasma;

D O I：

10.1585/PFR.18.1402062

中图分类号：

学科分类号：

摘要：

A digital phase analysis technique was applied to a 119-μm wavelength far-infrared (FIR) laser interferometer on the Large Helical Device (LHD). High-density plasma measurement without phase jumping was achieved, representing an improvement over measurements made using a conventional analog phase counter. Digital phase analysis became operational at a quarter of the threshold of the analog phase counter. The phase sensitivity was also improved using digital analysis because the noise level was reduced to approximately half that of the conventional analog phase counter. The improved phase sensitivity enabled measurement of small-amplitude fluctuations. © 2023 The Japan Society of Plasma Science and Nuclear Fusion Research

引用

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