2022 Fiscal Year Annual Research Report
Indirect measurement of the Hubble Constant through stereoscopic gamma-ray observations with CTA-LST and MAGIC
| Project/Area Number |
22H01226
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| Allocation Type | Single-year Grants |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Mazin Daniel 東京大学, 宇宙線研究所, 特任准教授 (90747990)
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| Co-Investigator(Kenkyū-buntansha) |
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, 教授 (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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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Keywords | gamma-rays / Cherenkov telescopes / hardware trigger / H0 constant / EBL |
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| Outline of Annual Research Achievements |
The stereo hardware trigger has been installed and validated.
In particular, we purchased and deployed a new trigger cable between the LST camera and MAGIC counting house shortening the trigger travel time by about 500ns compared to the previous installation. This is important to deliver the LST trigger in time to build a coincidence trigger with the MAGIC telescopes because MAGIC telescopes have a relatively short analog buffer length. We also installed a new firmware in MAGIC trigger system and developed the software code to control and monitor zenith and azimuth dependent trigger delays between LST and MAGIC telescopes. The trigger timing has been adjusted and several test data sets has been taken in hardware stereo mode.
In the same time work on methodology to derive constraints on the density of the Extragalactic Background Light has been done, which can be directly used to constrain the Hubble constant H0.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The progress of the project is within the schedule. The hardware part of the project has been designed, deployed and commissioned. The evaluation of the performance is ongoing.
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| Strategy for Future Research Activity |
In FY2023 we will study the actual performance and take data
on various gamma-ray sources. We expect several trips to La Palma to polish the performance of the trigger and make it to a standard trigger system between LST1 and MAGIC telescopes. We also expect to take first data with hardware stereo trigger on extragalactic sources to derive preliminary limits on the H0 constant.
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Research Products
(2 results)
