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2021 Fiscal Year Final Research Report

Development of a corrector lens of the K-EUSO space telescope for UHECR observation

Research Project

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Project/Area Number 19H01915
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Takizawa Yoshiyuki  国立研究開発法人理化学研究所, 光量子工学研究センター, 専任研究員 (70312246)

Co-Investigator(Kenkyū-buntansha) 榊 直人  国立研究開発法人理化学研究所, 開拓研究本部, 協力研究員 (90342790)
Project Period (FY) 2019-04-01 – 2022-03-31
Keywords超高エネルギー宇宙線 / 宇宙望遠鏡 / 大型プラスチックレンズ / フレネルレンズ / 大型レンズ製造
Outline of Final Research Achievements

The origin and nature of Ultra-High Energy Cosmic Rays (UHECRs, > 6×1019 eV) is one of mysteries of physics to be solved. Two grand observatories (Telescope Array and Auger) are observing UHECRs. However, two observatories have not found an origin of UHECRs due to low statistics. Japanese team proposed to use a corrector lens for a Russian UHECRs mission to the EUSO Russian team. With this change, this mission is able to observe all sky with 4 times larger annual exposure than Auger. At the beginning of this research (April 2019), the main task was corrector lens manufacturing. However, in June 2019, ROSCOSMOS reported a result of a conceptual design analysis of this mission. ROSCOSMOS required to re-design the telescope structure that Astronaut can easily assemble by their extravehicular activity. In this research, we and the Russian team designed an optical system that satisfies the ROSCOSMOS requirement and we manufacture two lenses for the new optics.

Free Research Field

高エネルギー宇宙線

Academic Significance and Societal Importance of the Research Achievements

超高エネルギー宇宙線の起源と加速機構のため、地上観測が進められているが、未だ統計不足で解明には至っていない。この解決方法として、広い面積を監視する「広角望遠鏡による宇宙からの観測」がある。日本チームは、EUSO計画で日本が担当した大型レンズの設計・製造技術と国際JEM- EUSOコラボレーションで開発した焦点面検出器ユニットの導入で、観測性能を向上させることを提案し、ロシアと日本のJEM-EUSOチームを核としたK-EUSO (KLYPVE-EUSO)ミッションが立ち上がった。K-EUSOは、Auger の年間露出量の4倍に達し、複数の起源天体の同定が期待でき「荷電粒子天文学」を創始を行う。

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Published: 2023-01-30  

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