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Absolute pulse energy measurement of XFEL using pulse radiometer

Research Project

Project/Area Number 17K18422
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Quantum beam science
General applied physics
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Tanaka Takahiro  国立研究開発法人産業技術総合研究所, 計量標準総合センター, 主任研究員 (30509667)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords放射計 / 自由電子レーザー / 校正 / カロリーメータ / 放射光 / X線自由電子レーザー / パルスエネルギー / 絶対測定 / X線自由電子レーザー / 検出器 / XFEL
Outline of Final Research Achievements

In this study, I have developed a new pulse radiometer for absolute measurement of the pulse energy of X-ray free electron laser Laser (XFEL).
The pulse radiometer consists of a cavity absorber that absorbs all the XFEL radiation, heat sinks and heat flux sensors. The heat flux sensors are placed between the cavity absorber and the heat sink. When the XFEL is completely absorbed by the absorber, the change of heat flux from the absorber to the heat sink is detected as the voltage signal. We have carried out a demonstration experiment at SACLA and successfully detected the signal caused by the XFEL pulse, but the time constant is insufficient for pulse resolved measurement for 60Hz repetition frequency of XFEL. Therefore, the pulse radiometer needs to be improved.

Academic Significance and Societal Importance of the Research Achievements

本研究成果の学術的意義は、従来の放射計の課題であった応答速度の飛躍的に向上させるため、従来の温度変化の測定から脱却し、熱流束の変化の測定に基づいた計測器を開発し、実証したことである。
既存の放射計の極低温放射計や常温放射計などは、温度測定に基づいて行われてきたため、出力が安定な光源(放射光やCWレーザー)に対しては有用であるが、パルス毎の強度変動が不可避であるXFELに対しては、この時定数の遅さは克服すべき課題となっていた。本研究で提案した熱流束測定に基づくパルス放射計は、既存の放射計の時定数の問題を克服する可能性の高い、世界的にも新しい試みである。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2019 2018 2017 Other

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

  • [Int'l Joint Research] European XFEL/DESY(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] 放射計による自由電子レーザーのパワーの絶対測定2019

    • Author(s)
      田中隆宏
    • Journal Title

      原子衝突学会誌

      Volume: 16 Pages: 28-39

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Air-kerma standard for mammography x-ray and radiometers for x-ray FEL2019

    • Author(s)
      Takahiro Tanaka
    • Organizer
      TCRI workshop in Melbourne
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Comprehensive evaluation of a compact room-temperature radiometer2018

    • Author(s)
      Takahiro Tanaka, Alexander Gottwald, Roman R. Klein, Udo Kroth, Hendrik Kaser, Reiner Thornagel, Janin Lubeck, Andrey A. Sorokin, Kai Tiedtke and Mathias Richter
    • Organizer
      Synchrotron Radiation Instrumentation (SRI 2018)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Radiometers for free‐electron lasers2017

    • Author(s)
      Takahiro Tanaka
    • Organizer
      304th PTB-Seminar VUV and EUV Metrology
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2017-04-28   Modified: 2021-02-19  

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