Search Results 1-20 of 36

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  • FPGA-based 32-tap Hilbert transformer design applied for direct phase detection method in heterodyne interferometry

    Nguyen Thanh Dong , Duong Quang Anh , Higuchi Masato , WEI Dong , Aketagawa Masato

    … In this paper, the design of a 32-taps Hilbert transformer with an FIR filter to generate the quadrature component of the reference is conducted. …

    Proceedings of JSPE Semestrial Meeting 2019S(0), 480-481, 2019

    J-STAGE 

  • Development of a New Far Infrared Laser Interferometer in Heliotron J and First Results

    OHTANI Yoshiaki , MARUSHCHENKO Nikolai. B. , KOBAYASHI Shinji , OKADA Hiroyuki , KADO Shinnichiro , YAMAMOTO Satoshi , ZANG Linge , WEIR Gavin M. , KENMOCHI Naoki , KONOSHIMA Shigeru , NAKAMURA Yuji , OHSHIMA Shinsuke , TURKIN Yuriy , SANO Fumimichi , ASAVATHAVORNVANIT Nuttasart , AKIYAMA Tsuyoshi , MINAMI Takashi , TANAKA Kenji , NAGASAKI Kazunobu , SHI Nan , MIZUUCHI Tohru

    … <p>A new far infrared (FIR) laser interferometer with high time resolution has been developed in Heliotron J for measuring high performance plasmas. … The FIR laser interferometer is a heterodyne-type Michelson interferometer with a 1 MHz intermediate frequency. … The interferometer uses a super rotating grating and the viewing chord passes through an off-axis position. …

    Plasma and Fusion Research 10(0), 1402091-1402091, 2015

    J-STAGE 

  • Electron Density Reconstruction and Optimum Beam Arrangement of Far-Infrared Interferometer in Heliotron J

    SHI Nan , OKADA Hiroyuki , KADO Shinichiro , KOBAYASHI Shinji , KONOSHIMA Shigeru , KENMOCHI Naoki , SANO Fumimichi , OHSHIMA Shinsuke , TANAKA Kenji , MINAMI Takashi , NAGASAKI Kazunobu , YAMAMOTO Satoshi , OHTANI Yoshiaki , ZANG Linge , MIZUUCHI Tohru

    … <p>A multichannel far-infrared (FIR) laser interferometer is being developed for the helical-axis heliotron device Heliotron J with asymmetrical poloidal cross-section to study high-density plasma. …

    Plasma and Fusion Research 9(0), 3402043-3402043, 2014

    J-STAGE 

  • Study of Plasma Current Decay in the Initial Phase of High Poloidal Beta Disruptions in JT-60U

    SHIBATA Yoshihide , MATSUNAGA Go , KAMADA Yutaka , SUGIHARA Masayoshi , WATANABE Kiyomasa , OHNO Noriyasu , OKAMOTO Masaaki , ISAYAMA Akihiko , KURIHARA Kenichi , OYAMA Naoyuki , NAKANO Tomohide , KAWANO Yasunori

    … The plasma resistance and inductance were evaluated from an equilibrium calculation code and the measurement value of a magnetic sensor, the electron temperature evaluated by using ECE measurement and the electron density measured by FIR interferometer. …

    Plasma and Fusion Research (6), 1302136-1302136, 2011

    J-STAGE 

  • 21pTE-9 Development of FIR laser interferometer in Heliotron J  [in Japanese]

    Takeuchi M. , 木島 滋 , 花谷 清 , 中村 祐司 , 佐野 史道 , Minami T. , Tanaka K. , Mizuuchi T. , 長崎 百伸 , 岡田 浩之 , 山本 聡 , 小林 進二 , 大島 慎介

    Meeting Abstracts of the Physical Society of Japan 65.1.2(0), 241, 2010

    J-STAGE 

  • Development of Two-color FIR Laser Interferometer by Two-wavelength CO_2 Laser Pumping  [in Japanese]

    NAKAYAMA Kazuya , OKAJIMA Shigeki , KAWAHATA Kazuo , TANAKA Kenji , AKIYAMA Tsuyoshi

    … Simultaneously oscillated multi-line far infrared (FIR) lasers from a single FIR laser cavity have been developed as optical sources of a two-color interferometer for plasma diagnostics. … Common beam splitters of the two-color FIR laser interferometer have been designed by using precise optical constants (refractive index and absorption coefficient) of silicon. …

    IEEJ Transactions on Fundamentals and Materials 129(11), 763-770, 2009-11-01

    J-STAGE  References (13)

  • Development of the FIR laser diagnostics for Burning Plasma experiment  [in Japanese]

    KAWAHATA Kazuo , AKIYAMA Tsuyoshi , TANAKA Kenji , OKAJIMA Shigeki , NAKAYAMA Kazuya

    日本赤外線学会誌 = Journal of the Japan Society of Infraed Science and Technolog 17(1), 31-38, 2008-03-28

    References (22)

  • Development of the FIR laser diagnostics for burning plasma experiment  [in Japanese]

    川端 一男 , 秋山 毅志 , 田中 謙治 [他]

    Journal of the Japan Society of Infraed Science and Technolog 17(1), 31-38, 2008-03

  • Bench Testing of New Polarimeter with Silicon Photoelastic Modulator for Short Wavelength FIR Laser

    Tsuyoshi AKIYAMA , Kazuo KAWAHATA , Shigeki OKAJIMA , Kazuya NAKAYAMA , Theodore C. OAKBERG

    … A short wavelength laser whose wavelength is about 50 μm is preferable for a polarimeter and an interferometer in large fusion devises. …

    Plasma and Fusion Research (Vol. 2), S1113-1 - S1113, 2007-01-01

    IR 

  • Development of Short-Wavelength Far-Infrared Lasers and Optical Elements for Plasma Diagnostics

    NAKAYAMA Kazuya , TOMIMOTO Masahiro , OKAJIMA Shigeki , KAWAHATA Kazuo , TANAKA Kenji , TOKUZAWA Tokihiko , AKIYAMA Tsuyoshi , ITO Yasuhiko

    … laser have been developed to establish a new two-color FIR laser interferometer system for high density and large volume plasma diagnostics. … To design the collimated beams for the interferometer, the beam profiles and the divergence angles have been measured for the 48- and 57-μm CH<sub>3</sub>OD lasers oscillated simultaneously. …

    Plasma and Fusion Research (2), S1114-S1114, 2007

    J-STAGE 

  • Bench Testing of New Polarimeter with Silicon Photoelastic Modulator for Short Wavelength FIR Laser

    AKIYAMA Tsuyoshi , KAWAHATA Kazuo , OKAJIMA Shigeki , NAKAYAMA Kazuya , OAKBERG Theodore C.

    … A short wavelength laser whose wavelength is about 50 μm is preferable for a polarimeter and an interferometer in large fusion devises. …

    Plasma and Fusion Research (2), S1113-S1113, 2007

    J-STAGE  Cited by (1)

  • Reconstruction of Edge Density Profiles Using Ultrashort-Pulse Reflectometry in LHD

    YOKOTA Yuya , MASE Atsushi , KOGI Yuichiro , TOKUZAWA Tokihiko , KAWAHATA Kazuo

    … The density profiles in the edge region are successfully determined and compared with those obtained by an FIR laser interferometer. …

    Plasma and Fusion Research (1), 040-040, 2006

    J-STAGE 

  • 02aC11P Development of far-infrared laser interferometer system in Heliotron J  [in Japanese]

    Watanabe S. , Nagasaki K. , 水内 亨 , Yamamoto S. , Akiyama T. , Sano F. , Kobayashi S. , Okada H. , Kondo K. , Torii Y. , Motojima G. , Kaneko M. , Arimoto H. , Tsuji T. , Nakamura H. , Kitagawa H. , Yabutani H. , Uno M. , Fujikawa S. , Watanabe N.

    プラズマ・核融合学会年会予稿集 (22), 264, 2005

    NDL Digital Collections 

  • 30aB20P Development of a new two colour FIR laser interferometer (III)  [in Japanese]

    KAWAHATA Kazuo , TANAKA Kenji , TOKUZAWA Tokihiko , ITO Yasuhiko , 秋山 毅志 , Pavlichenko R. , OKAJIMA Shigeki , NAKAYAMA Kazuya

    プラズマ・核融合学会年会予稿集 (22), 133, 2005

    NDL Digital Collections 

  • Development of a new two color far infrared laser interferometer for future fusion devices

    K. Kawahata , K. Tanaka , T. Tokuzawa , T. Akiyama , Y. Ito , S. Okajima , K. Nakayama , R.J. Wylde

    … A new two color far infrared (FIR) laser interferometer under development for future fusion devices will be presented. … The output power of 57.2 ?m CH_3OD laser is estimated to be ~1.6 W, which is the highest laser power in the FIR wavelength regime. … The optical configuration of a new interferometer system using two colors will be proposed. … Mechanical vibration can be compensated by using the two color interferometer. …

    Review of Scientific Instruments Vol.75(Issue10), pp.3508-3510, 2004-10-01

    IR 

  • 24aB06 Development of a new two colour FIR laser interferometer (II)  [in Japanese]

    KAWAHATA Kazuo , TANAKA Kenji , TOKUZAWA Tokihiko , ITO Yasuhiko , 秋山 毅志 , OKAJIMA Shigeki , NAKAYAMA Kazuya

    プラズマ・核融合学会年会予稿集 (21), 149, 2004

    NDL Digital Collections 

  • 27pA05 Development of a new two colour FIR laser interferometer  [in Japanese]

    KAWAHATA Kazuo , TANAKA Kenji , TOKUZAWA Tokihiko , ITO Yasuhiko , OKAJIMA Shigeki , NAKAYAMA Kazuya

    プラズマ・核融合学会年会予稿集 (20), 183, 2003

    NDL Digital Collections 

  • Protostellar Jets  [in Japanese]

    FURUYA Ray S.

    … Subsequently we report our discovery of a newly ejected extraordinarily compact protostellar jet-a micro jet-from the Class 0 protostar S 106 FIR. … We propose that S106 FIR is an archetype of the youngest evolutionary class, a protostar observed just after the creation of the protostellar jet. …

    Journal of plasma and fusion research 76(7), 633-641, 2000-07-25

    NDL Digital Collections  References (10) Cited by (2)

  • Use of Glass Beads Filter in Scanning Fabry-Perot Interferometry

    Dodo Taro , Sugawa Masao , Hashimoto Fumiaki , Matsuki Nobuyuki

    … In FIR spectrometry, an interference low-pass filter is used to cut the harmonics of a Fabry-Perot interferometer (FPI). … The combined use of an interference filter and a glass bead filter gives good performance in FIR spectrometry. …

    Japanese Journal of Applied Physics 30pt1(1), 178-179, 1991

    J-STAGE 

  • Use of Glass Beads Filter in Scanning Fabry-Perot Interferometry

    Dodo Taro , Sugawa Masao , Hashimoto Fumiaki , Matsuki Nobuyuki

    … In FIR spectrometry, an interference low-pass filter is used to cut the harmonics of a Fabry-Perot interferometer (FPI). … The combined use of an interference filter and a glass bead filter gives good performance in FIR spectrometry. …

    Japanese Journal of Applied Physics 30pt1(1), 178-179, 1991

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