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
收藏
相关论文
共 50 条
  • [1] Application of Digital Phase Analysis to Far-Infrared Laser Interferometer for the Large Helical Device
    Sakai, Hikona
    Tanaka, Kenji
    Takemura, Yuki
    Ito, Yasuhiko
    Tokuzawa, Tokihiko
    Yasuhara, Ryo
    Uehara, Hiyori
    Kinoshita, Toshiki
    Akiyama, Tsuyoshi
    Nakayama, Kazuya
    Kawahata, Kazuo
    PLASMA AND FUSION RESEARCH, 2023, 18
  • [2] Far infrared laser interferometer system on the large helical device
    Rev Sci Instrum, 1 pt 2 (707):
  • [3] Far infrared laser interferometer system on the Large Helical Device
    Kawahata, K
    Tanaka, K
    Ito, Y
    Ejiri, A
    Okajima, S
    REVIEW OF SCIENTIFIC INSTRUMENTS, 1999, 70 (01): : 707 - 709
  • [4] Far-infrared Fizeau interferometer for large aspheric mirror
    Wu Yongqian
    Zhang Yudong
    Wu Fan
    Chen Qiang
    Li Lianghong
    INTERFEROMETRY XIV: APPLICATIONS, 2008, 7064
  • [5] FIRI—A far-infrared interferometer
    Frank P. Helmich
    R. J. Ivison
    Experimental Astronomy, 2009, 23 : 245 - 276
  • [6] Continuous-wave terahertz phase imaging using a far-infrared laser interferometer
    Wang, Yingxin
    Zhao, Ziran
    Chen, Zhiqiang
    Zhang, Li
    Kang, Kejun
    Deng, Jingkang
    APPLIED OPTICS, 2011, 50 (35) : 6452 - 6460
  • [7] THE IMPROVED PYROELECTRIC DETECTORS FOR FAR-INFRARED LASER INTERFEROMETER MEASURING
    GAO, XA
    INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1990, 11 (05): : 641 - 649
  • [8] DESIGN OF REMOTE CONTROL SYSTEM FOR FAR-INFRARED LASER INTERFEROMETER
    Shi Nan
    Gao Xiang
    Jie Yinxian
    Wang Erhui
    Yang Yao
    PROCEEDINGS OF THE 18TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING 2010, VOL 1, 2011, : 701 - 706
  • [9] ANALYSIS OF A MODEL OF A FAR-INFRARED LASER
    WU, XG
    MANDEL, P
    JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1986, 3 (05) : 724 - 731
  • [10] A HELICAL UNDULATOR FOR THE FAR-INFRARED FREE-ELECTRON LASER
    BUKIN, AI
    GASKEVICH, EB
    KURAKIN, VG
    SAVUSHKIN, OV
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1994, 341 (1-3): : AB117 - AB118
12345