| Project/Area Number |
18K03684
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
Sakashita Ken 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (50435616)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | ニュートリノ / 液体アルゴンTPC / ニュートリノ原子核相互作用 / 液体アルゴン |
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| Outline of Final Research Achievements |
The development of a large size "Liquid Argon Time Projection Chamber (LAr TPC)" was studied. In this study, we developed a dual-phase liquid-argon TPC to realize a high signal-to-noise ratio. We successfully achieved to observe a signal from cosmic-ray muon events in which the signal gain was about 9 with the dual-phase TPC. On the other hand, we also turned out that a electrical discharge of the large area GEM boards is one of serious problem toward the realization of large size LArTPC. We plan to develop a GEM using a high resistive material in order to resolve this problem.
In parallel with the dual-phase readout R&D, we also developed an application-specific integrated circuit (ASIC) that can read out a large size signal without any saturation and keeping a low noise. It was confirmed that the ASIC satisfied the requirements from the detector such as a dynamic range and amount of internal noise as predicted by the simulation.
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| Academic Significance and Societal Importance of the Research Achievements |
ニュートリノ原子核反応の理解は、ニュートリノ振動の全容解明にむけて事前に解決すべきステップである。液体アルゴンTPCは、反応から放出される荷電粒子の飛跡を3次元で詳細に捉え高い粒子識別やエネルギー測定能力によりニュートリノ原子核反応を詳細に調べることができるが、実際の実験に必要な大型化に課題がある。本研究成果を基に、液体アルゴンTPCの大型化にむけた課題の１つ、高い信号-雑音比での信号読み出しが可能になった。また、本研究で開発する検出器技術開発は、他の素粒子原子核の測定器や、医療用イメージングデバイスへの応用も可能である。
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