| 研究課題/領域番号 |
23K22497
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| 補助金の研究課題番号 |
22H01226 (2022-2023)
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| 研究種目 |
基盤研究(B)
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| 配分区分 | 基金 (2024)
補助金 (2022-2023) |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分15020:素粒子、原子核、宇宙線および宇宙物理に関連する実験
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| 研究機関 | 東京大学 |
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研究代表者 |
Mazin Daniel 東京大学, 宇宙線研究所, 特任教授 (90747990)
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| 研究分担者 |
Vovk Ievgen 東京大学, 宇宙線研究所, 助教 (20899405)
手嶋 政廣 東京大学, 宇宙線研究所, グローバルフェロー (40197778)
齋藤 隆之 東京大学, 宇宙線研究所, 助教 (60713419)
高橋 光成 名古屋大学, 宇宙地球環境研究所, 特任助教 (60838960)
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| 研究期間 (年度) |
2022-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2024年度)
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| 配分額 *注記 |
15,600千円 (直接経費: 12,000千円、間接経費: 3,600千円)
2024年度: 2,730千円 (直接経費: 2,100千円、間接経費: 630千円)
2023年度: 5,850千円 (直接経費: 4,500千円、間接経費: 1,350千円)
2022年度: 7,020千円 (直接経費: 5,400千円、間接経費: 1,620千円)
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| キーワード | Hubble constant / Cherenkov telescopes / Hardware stereo trigger / gamma-rays / trigger system / EBL / Hubble Constant / gamma-ray / Cherenkov / hardware trigger / H0 constant / IACT / Trigger / gamma rays |
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| 研究開始時の研究の概要 |
We will take data on flaring AGNs and GRBs with the new trigger system. We will analyse joint CTA-LST and MAGIC data and derive constraints on the extragalactic background light as well as the Hubble Constant H0. We also look into a new technology of Hollow Core Fibers to improve the trigger system.
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| 研究実績の概要 |
In FY2023 the hardware stereo trigger has been commissioned and first gamma-ray flux sensitivity results have been obtained. Taking joint LST1-MAGIC data with the hardware stereo trigger proved to collect about 100% more gamma rays than with the LST1 and MAGIC run separately, due to addition of the LST1-MAGIC1 and LST1-MAGIC2 events, which did not trigger the third telescope. The additional events recorded with the hardware stereo triggers are, as expected, clustered at low gamma-ray energies, which is in particular use for distant sources, like AGNs and GRBs. The improved sensitivity has been shown at the JPS meeting in Spring FY2023. Data on Crab nebula and Mrk421 has been collected. On theoretical side, a methodology has been prepared to derive Hubble Constant H0 from gamma-ray data.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The progress is smooth. The hardware part is finished but some drawbacks have been recognized. 1. Only 50% of the sky is accessible with the newly developed hardware stereo trigger for LST1 and MAGIC telescopes. This makes it more difficult to obtain a sufficient amount of data needed to constrain the extragalactic background light and to determine the Hubble Constant H0.
2. The usage of the hardware is not automatic, MAGIC telescope operators have to be instructed to use it every time. This reduces the amount of data taken.
On the theoretical side, the methodology to constrain the EBL and the Hubble Constant H0 is in place and waits for gamma-ray data to be applied to.
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| 今後の研究の推進方策 |
in FY2024 automation of the usage of the hardware stereo trigger should be implemented to increase the amount of data taken. Also analysis tools of this type of joint LST1-MAGIC data has to be improved (which goes beyond the scope of this grant). We are also investigating a possibility of using a hollow fiber, which is a new technology promising to save some 200ns in propagation of the trigger signal from LST1 to MAGIC, which in turn would open the accessible sky porting from currently 50% to 90%. Finally, we are hoping to obtain data on flares from AGN and close-by GRBs to produce and publish results on EBL and Hubble Constant H0.
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