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Establishment of high accuracy diagnostic method of highly ionised tungsten ion in high temperature plasmas in next generation fusion devices

Research Project

Project/Area Number 15K06658
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institutes for Quantum and Radiological Science and Technology (2016-2018)
Japan Atomic Energy Agency (2015)

Principal Investigator

Nakano Tomohide  国立研究開発法人量子科学技術研究開発機構, 那珂核融合研究所 先進プラズマ研究部, 上席研究員(定常) (50354593)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords原子分子データ / 原子過程 / 二電子性再結合 / プラズマ・核融合 / 原子物理 / 原子データ / タングステン / 電離断面積 / 再結合断面積
Outline of Final Research Achievements

The purpose of this study is to evaluate uncertainties of the calculated W62+ ionization and W63+ recombination cross-sections. Because of difficulties in direct measurement of the cross-sections, evaluation of the uncertainties by direct comparison between calculated and measured cross-sections are not available.
We have developed a method, by which dependence of emission intensities on electron impact energy is cancelled out. The method enables direct comparison of the ratio of W62+ to W63+ emission intensity with the ratio of W63+ recombination to W62+ ionization cross-section. The comparison indicates that uncertainty of the calculated cross-sections is small in a low electron impact energy range but large in a high electron impact energy range. This suggests that further improvement of the calculation is required.

Academic Significance and Societal Importance of the Research Achievements

計算したW62+電離・W63+再結合断面積は改善すべき部分はあるものの,本研究により初めて精度が評価された断面積を整備した.将来の核融合炉プラズマ中のタングステンイオン密度の導出に本データを用いることによって,その測定値に対する精度(真のタングステンイオン密度が存在する範囲)を評価することが可能である.これは測定を質的に向上させることから,以前より切望されていたデータである.さらなる理論計算の改善により,高電子衝突エネルギーでの精度の向上を目指す.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (5 results)

All 2019 2018 2016

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results) Funded Workshop (1 results)

  • [Journal Article] Spatial distribution of Ne ions in detached divertor plasmas of JT-60U2019

    • Author(s)
      Nakano T.、Asakura N.
    • Journal Title

      Nuclear Materials and Energy

      Volume: 18 Pages: 356-359

    • DOI

      10.1016/j.nme.2019.01.020

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Calculation of W62+ ionisation and W63+ recombination cross sections2018

    • Author(s)
      仲野 友英 , 大橋隼人 , 中村信行
    • Organizer
      プラズマ・核融合学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Spatial distribution of highly charged Ne ions in detached divertor plasmas of JT-60U2018

    • Author(s)
      Nakano T.、Asakura N.
    • Organizer
      International Conference on Plasma Surface Interactions in Controlled Fusion Devices
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] EXPERIMENTAL EVALUATION OF W44+ IONIZATION AND W45+ RECOMBINATION CROSS-SECTIONSI2016

    • Author(s)
      T. Nakano1, H. Ohashi and N. Nakamura
    • Organizer
      ICAMDATA2016
    • Place of Presentation
      Gunsan Saemangeum Convention Center, Rep. of Korea, Gunsan
    • Year and Date
      2016-09-26
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Funded Workshop] International Conference on Plasma Surface Interactions in Controlled Fusion Devices2018

    • Related Report
      2018 Annual Research Report

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Published: 2015-04-16   Modified: 2020-03-30  

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