Search Results 1-20 of 671

  • Advanced diagnostics of industrial plasmas using laser Thomson scattering  [in Japanese]

    TOMITA Kentaro

    <p>最近のレーザートムソン散乱(LTS)計測の事例として,半導体露光用極端紫外(EUV)光源用プラズマの構造解明研究を紹介する.本研究では計測用レーザーからの迷光を低減しつつ,電子温度の検出下限を従来システムから2桁程度向上させた.これにより協同散乱のイオン項を検出し,電子密度・温度,平均イオン価数の計測を可能とした.直径0.5mm以下のサイズである光源の電子密度・温度の2次元空間分 …

    Oyo Buturi 89(5), 260-264, 2020

    J-STAGE 

  • Studies of a Lower-Hybrid Wave Driven Plasma Equilibrium with a Hybrid-MHD Model on the TST-2 Spherical Tokamak

    TSUJII Naoto , KO Yongtae , MATSUZAKI Kyohei , RICE James H.P. , OSAWA Yuki , YOSHIDA Yusuke , TAKASE Yuichi , EJIRI Akira , WATANABE Osamu , YAMAZAKI Hibiki , PENG Yi , IWASAKI Kotaro , AOI Yuki

    … The resulting poloidal flux function was more skewed towards the outboard side when fast electrons were introduced, which was more consistent with the density profile measured by the Thomson scattering diagnostic.</p> …

    Plasma and Fusion Research 15(0), 2402010-2402010, 2020

    J-STAGE 

  • Spatial and temporal measurement of recombining detached plasmas by laser Thomson scattering

    Kajita Shin , Ohshima Hiroshi , Tanaka Hirohiko , Seki Masamichi , Takano Hiroki , Ohno Noriyasu

    ファイル公開:2020-10-21

    Plasma Sources Science and Technology 28(10), 105015, 2019-10-21

    IR 

  • Investigation of recombination front region in detached plasmas in a linear divertor plasma simulator

    吉川 正志 , N. Ohno , M. Seki , H. Ohshima , H. Tanaka , S. Kajita , Y. Hayashi , H. Natsume , H. Takano , I. Saeki , Masayuki YOSHIKAWA , H. van der Meiden

    … We have investigated detailed plasma structure around the recombination front region (RFR), where volume electron-ion recombination (EIR) strongly occurs in detached plasmas, by using two-dimensional (2D) movable probe system as well as laser Thomson scattering diagnostics. …

    Nuclear Materials and Energy (19), 458-462, 2019-05

    IR 

  • Observation of the whole Thomson scattering spectrum of laser-produced plasmas for EUV light sources

    Sato Yuta , Fukada Raimu , Ito Fumitaka , Tomita Kentaro , Uchino Kiichiro

    … The whole spectrum including the ion feature and the electron feature of collective Thomson scattering from laser-produced tin plasmas for EUV light sources has been observed for the first time. … By applying the spectrometer system appropriately designed and optimizing the scattering geometry, it was achieved to detect the peak of the electron feature with the signal-to-noise ratio larger than one. …

    九州大学大学院総合理工学報告 40(2), 11-15, 2019-02

    IR 

  • Laser Thomson scattering diagnostics for streamer discharge in high pressure He gas  [in Japanese]

    村上 倫理 , 江口 恭平 , 王 斗艶 , 富田 健太郎 , 浪平 隆男

    <p>非熱平衡プラズマの一種であるパルスストリーマ放電プラズマは、様々な化学活性種を生成することが知られており、水処理やオゾン生成など、多くの分野に応用されている。しかし、ストリーマ放電の十分な基礎特性解明は未だ達成されていないため、ストリーマ放電に関する基礎的研究が必要である。本研究では、針対円錐電極におけるストリーマ放電の進展過程をICCDカメラで観察し、ストリーマ放電の特性を調べ …

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu 2019(0), 157-158, 2019

    J-STAGE 

  • Fast Tangentially Viewed Soft X-Ray Imaging System Based on Image Intensifier with Microchannel Plate Detector on QUEST

    HUANG Canbin , ONCHI Takumi , HANADA Kazuaki , KURODA Kengoh , KOJIMA Shinichro , FUJIYOSHI Hiroaki , MIURA Hiroki , YAMADA Tomoki , IDEI Hiroshi , HASEGAWA Makoto

    … The proposed method was used to obtain SXR spectra in the energy range 1.5 - 3.5 keV with a core electron temperature in agreement with electron temperatures measured by the Thomson scattering method. …

    Plasma and Fusion Research 14(0), 1402128-1402128, 2019

    J-STAGE 

  • Oscillation Characteristics of a High Power 300 GHz Band Pulsed Gyrotron for Use in Collective Thomson Scattering Diagnostics

    SAITO Teruo , NISHIURA Masaki , TANAKA Shunsuke , SHINBAYASHI Ryuji , TATEMATSU Yoshinori , YAMAGUCHI Yuusuke , FUKUNARI Masafumi , KUBO Shin , SHIMOZUMA Takashi , TANAKA Kenji

    … <p>A high power sub-THz pulsed gyrotron with a frequency of 303 GHz has been developed for use as the power source of the collective Thomson scattering (CTS) diagnostics in the Large Helical Device (LHD) at the National Institute for Fusion Science. …

    Plasma and Fusion Research 14(0), 1406104-1406104, 2019

    J-STAGE 

  • Improvement of Aperture Configuration to Reduce the Stray Light for Thomson Scattering Measurement Using a Peripheral Beam Profile Monitor

    KAWAMATA Yuya , EJIRI Akira , MATSUZAKI Kyohei , TAKASE Yuichi , TSUJII Naoto , ONCHI Takumi , NAGASHIMA Yoshihiko

    … <p>The stray light is a major problem in Thomson scattering (TS) measurements. …

    Plasma and Fusion Research 14(0), 1402072-1402072, 2019

    J-STAGE 

  • Development of Thomson Scattering Measurement System for Upstream Plasmas in the NAGDIS-II Device

    TAKANO Hiroki , OHSHIMA Hiroshi , KAJITA Shin , TANAKA Hirohiko , OHNO Noriyasu

    … <p>A new laser Thomson scattering (LTS) measurement system in the upstream region of the linear plasma device NAGDIS-II is established in addition to the recently introduced LTS in the downstream. …

    Plasma and Fusion Research 14(0), 2405031-2405031, 2019

    J-STAGE 

  • YAG-Thomson Scattering System in GAMMA 10/PDX Central and End Cells

    YOSHIKAWA Masayuki , MINAMI Ryutaro , EZUMI Naomichi , YAMADA Ichihiro , YASUHARA Ryo , FUNABA Hisamichi , MINAMI Takashi , KENMOCHI Naoki , MOURI Tomoya , KOHAGURA Junko , SHIMA Yoriko , YAMASAKI Tomoya , SUTO Shun , NAKANISHI Hiroyuki , SAKAMOTO Mizuki , NAKASHIMA Yousuke

    … <p>We developed an yttrium aluminum garnet (YAG)-Thomson scattering (TS) system for radial profile measurements of electron temperature and density in the GAMMA 10/PDX central cell. …

    Plasma and Fusion Research 14(0), 2402002-2402002, 2019

    IR  J-STAGE 

  • An Outlook into a Possible Intensified Camera Based Thomson Scattering System for High Temperature Plasmas

    LEE Kiyong

    … <p>A possible intensified camera based Thomson scattering (TS) system for high temperature plasma measurement of over 100 eV is investigated. … Due to the broad wavelength range of the scattering spectrum, to increase detection of photons per pixel, the optical setup have to compromise of the most efficient element that uses volume phase holographic (VPH) grating and a wire grid polarizer. …

    Plasma and Fusion Research 14(0), 2401019-2401019, 2019

    J-STAGE 

  • Development of a laser amplification system for the multi-pass Thomson scattering system for GAMMA 10/PDX

    吉川 正志 , 小波藏 純子 , 坂本 瑞樹 , 江角 直道 , 南 龍太郎 , M. Yoshikawa , J. Kohagura , M. Chikatsu , Y. Shima , M. Sakamoto , Y. Nakashima , N. Ezumi , R. Minami , R. Yasuhara , I. Yamada , H. Funaba , T. Minami , N. Kenmochi

    … The multi-pass Thomson scattering (MPTS) system is a useful technique for increasing the Thomson scattering (TS) signal intensities and improving the TS diagnostic time resolution. … The MPTS system has been constructed for enhancing the Thomson scattered signals for the improvement of measurement accuracy and the megahertz sampling time resolution. …

    Review of scientific instruments 89(10), 10C102, 2018-10

    IR 

  • Helium line emission spectroscopy in recombining detached plasmas

    Kajita Shin , Suzuki Kensuke , Tanaka Hirohiko , Ohno Noriyasu

    … When using four line emissions (501.6, 667.8, 706.5, and 728.1 nm), the discrepancy of the results compared to results from the laser Thomson scattering (LTS) method increased along with increasing gas pressure. …

    Physics of Plasmas 25(6), 063303, 2018-06-15

    IR 

  • Incoherent laser Thomson scattering diagnostic for pulsed streamer discharge  [in Japanese]

    江口 恭平 , 藤田 遼 , 王 斗艶 , 浪平 隆男 , 富田 健太郎

    <p>非熱平衡プラズマの一種であるパルスストリーマ放電プラズマは、様々な化学活性種を生成することが知られており、水処理やオゾン発生など、多くの分野に応用されている。しかし、ストリーマ放電の詳細な基礎特性は未だ不明である。したがって、ストリーマ放電に関する基礎的研究が必要である。本研究では、ICCDカメラを用いて針対円錐電極におけるストリーマヘッドの進展過程を観察し、ストリーマ放電の特性 …

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu 2018(0), 58-58, 2018

    J-STAGE 

  • Collective Thomson Scattering Diagnostics and spectrum analysis in LHD deuterium plasma  [in Japanese]

    Iizawa Moe , Kubo Shin , Nishiura Masaki , Tanaka Kenji , Shimozuma Takashi , LHD Experiment Group

    Meeting Abstracts of the Physical Society of Japan 73.1(0), 803-803, 2018

    J-STAGE 

  • Thomson Scattering Measurement of Two Electron Temperature Components in Transition to Detached Plasmas

    OHSHIMA Hiroshi , KAJITA Shin , TANAKA Hirohiko , OHNO Noriyasu , VAN DER MEIDEN Hennie J.

    … <p>We have performed laser Thomson scattering (LTS) measurements during the transition between attached and detached helium plasmas in the linear divertor simulator NAGDIS-II. …

    Plasma and Fusion Research 13(0), 1201099-1201099, 2018

    J-STAGE 

  • Radial Profile Measurements of Electron Temperature and Density Using the Thomson Scattering System in GAMMA 10/PDX

    YOSHIKAWA Masayuki , FUNABA Hisamichi , MINAMI Takashi , KENMOCHI Naoki , KOHAGURA Junko , CHIKATSU Masayuki , SHIMA Yoriko , SAKAMOTO Mizuki , NAKASHIMA Yousuke , MINAMI Ryutaro , YAMADA Ichihiro , YASUHARA Ryo

    … <p>We developed the YAG Thomson scattering (TS) system for electron temperature and density radial profiles in a single laser shot in the tandem mirror GAMMA 10/PDX. …

    Plasma and Fusion Research 13(0), 3402051-3402051, 2018

    IR  J-STAGE 

  • Thomson Scattering Measurement of Laser-Produced Plasma in a Magnetic Thrust Chamber

    ITADANI Yutaro , NISHIMURA Hiroaki , SUNAHARA Atushi , MORI Yoshitaka , JOHZAKI Tomoyuki , NAKASHIMA Hideki , YAMAMOTO Naoji , MORITA Taichi , SAITO Naoya , EDAMOTO Masafumi , KOJIMA Tomihiko , TAKAGI Mariko , NAGASHIMA Keisuke , FUJIOKA Shinsuke , YOGO Akifumi

    … We constructed a spectrometer with high wavelength resolution of 35 pm to obtain plasma parameters by measuring ion feature of laser Thomson scattering from a laser-produced plasma in a magnetic thrust chamber. …

    Plasma and Fusion Research 13(0), 1306016-1306016, 2018

    J-STAGE 

  • Effect of wall light reflection in ITER diagnostics

    Kajita Shin , Aumeunier Marie-Helene , Yatsuka Eiichi , Andreenko Evgeny , Alekseev Andrey , Kukushkin Alexander , Neverov Vladislav , Kocan Martin , Bassan Michele , Veshchev Evgeny , DeBock Maarten , Barnsley Robin , Kukushkin Andrei , Reichle Roger , Walsh Michael

    … Four different diagnostics in ITER were chosen for the simulation, i.e. visible spectroscopy, infrared thermography, edge laser Thomson scattering, and charge exchange recombination spectroscopy. …

    Nuclear Fusion 57(11), 116061-116061, 2017-09-04

    IR 

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