• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Realization of high-sensitivity imaging measurements of plasma radiation for divertor detachment study

Research Project

Project/Area Number 19K14689
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Mukai Kiyofumi  核融合科学研究所, ヘリカル研究部, 助教 (90632266)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords非接触ダイバータ / ボロメータ / イメージング / 輻射計測 / 非接触プラズマ / 薄膜 / プラズマ計測 / 核融合 / 真空蒸着
Outline of Research at the Start

核融合炉では、装置内壁の局所的な熱負荷を減らすため、プラズマ周辺のダイバータ部を内壁と非接触にする、非接触ダイバータという運転手法が考えられている。その実現には、プラズマからの輻射を含むエネルギーの伝搬を明らかにする必要があり、高感度・多チャンネル(イメージング)の輻射計測が求められる。
本研究では、ダイバータプラズマを対象とし、薄膜検出器の金属層の構造を①真空蒸着法により薄くする、②小型の検出器に分割して熱伝導による損失を減らす、という2つのアプローチで計測を高感度化する。

Outline of Final Research Achievements

In this study, I have improved the sensitivity of the InfraRed imaging Video Bolometer (IRVB), which is a 2-D radiation diagnostic necessary for investigating the energy balance of divertor detachment. For an IRVB on GAMMA10 / PDX (University of Tsukuba) that is conducting divertor simulation experiment, (1) an infrared camera was replaced to maximize the number of pixels observing a foil detector, (2) a titanium foil with one micron thickness was selected as the detector by optimizing foil material and thickness for the measurement with the photon energy <= 1 keV. By the sensitivity improvement, I successfully measured the radiation profile even in Ne seeded plasmas. The radiation in Xe seeded plasmas is more than three times that of in Ne seeded plasmas. Therefore, it is expected that the high-sensitivity IRVB will contribute to the investigation of the physical mechanism of the divertor detachment by comparing the species of impurity gases in the future.

Academic Significance and Societal Importance of the Research Achievements

核融合発電の実現には装置内壁の局所熱負荷を減らす必要があり、不純物ガスを入射し輻射損失を増やして熱負荷を分散する、非接触ダイバータと呼ばれる運転方法が検討されている。その物理機構の解明には中小型のプラズマ実験装置を活用して知見を蓄積する必要がある一方で、中小型の装置では輻射が弱いため計測器の高感度化が課題であった。
本研究では、輻射イメージング計測の主要な構成部品である赤外線カメラや薄膜検出器の材質及び膜厚を検討し、高感度化に成功した。これまで計測できなかった不純物ガス種の条件でも輻射計測が可能となったことで、今後中小型装置を活用した非接触ダイバータの物理機構の解明が進展すると期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Sensitivity improvement of infrared imaging video bolometer for divertor plasma measurement2021

    • Author(s)
      Mukai K.、Peterson B. J.、Ezumi N.、Shigematsu N.、Ohshima S.、Miyashita A.、Matoike R.
    • Journal Title

      Review of Scientific Instruments

      Volume: 92 Issue: 6 Pages: 063521-063521

    • DOI

      10.1063/5.0043664

    • NAID

      120007166309

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Steady-state sustainment of divertor detachment with multi-species impurity seeding in LHD2021

    • Author(s)
      Mukai Kiyofumi、Masuzaki Suguru、Hayashi Yuki、Oishi Tetsutaro、Suzuki Chihiro、Kobayashi Masahiro、Tokuzawa Tokihiko、Tanaka Hirohiko、Tanaka Kenji、Kinoshita Toshiki、Sakai Hikona、Peterson Byron Jay
    • Journal Title

      Nuclear Fusion

      Volume: 61 Issue: 12 Pages: 126018-126018

    • DOI

      10.1088/1741-4326/ac2bbc

    • NAID

      120007167590

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Feature extraction from two-dimensional radiation images of impurity seeded plasmas on Large Helical Device2021

    • Author(s)
      Kiyofumi MUKAI, B. J. Peterson, G. Kawamura, and K. Munechika
    • Organizer
      The 30th International Toki Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LHD不純物入射プラズマの2次元輻射画像からの特徴抽出2021

    • Author(s)
      向井清史、ピーターソンバイロン、河村学思、宗近洸洋
    • Organizer
      第38回プラズマ・核融合学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ダイバータプラズマ計測を目的としたイメージングボロメータの高感度化2020

    • Author(s)
      向井清史、Byron J. Peterson、江角直道、重松直希、大島慎介、宮下顕、的池遼太
    • Organizer
      第37回プラズマ・核融合学会年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Sensitivity Improvement of Infrared Imaging Video Bolometer for Divertor Plasma Measurement2020

    • Author(s)
      Kiyofumi Mukai, Byron J. Peterson, Naomichi Ezumi, Naoki Shigematsu, Shinsuke Oshima, Akira Miyashita, and Ryota Matoike
    • Organizer
      High-Temperature Plasma Diagnostics Conference (HTPD 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Radiative Divertor Using Impurity Seeding on Large Helical Device2019

    • Author(s)
      Kiyofumi Mukai, Suguru Masuzaki, Yuki Hayashi, Chihiro Suzuki, Tetsutaro Oishi, Masahiro Kobayashi, Hirohiko Tanaka, Byron J. Peterson
    • Organizer
      22nd International Stellarator and Heliotron Workshop 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] LHDにおける不純物ガス入射によるダイバータ熱負荷軽減2019

    • Author(s)
      向井清史、増崎貴、林祐貴、鈴木千尋、大石鉄太郎、 小林政弘、田中宏彦、Byron J. Peterson
    • Organizer
      第36回プラズマ・核融合学会年会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Remarks] 2種類の不純物入射で安定したプラズマ装置壁の熱負荷低減を実現

    • URL

      https://www-lhd.nifs.ac.jp/pub/Science/Paper_NF61-126018.html

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi