| Project/Area Number |
19K23438
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0203:Particle-, nuclear-, astro-physics, and related fields
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| Research Institution | Okayama University (2020-2022)
The University of Tokyo (2019) |
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Principal Investigator |
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| Project Period (FY) |
2019-08-30 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | astrophysics / cosmology / systematic effects / cosmic ray / detectors / particle interactions |
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| Outline of Research at the Start |
The next generation of cosmology missions seek to measure direct evidence of inflation theory. To reduce uncertainties created by Earth's atmosphere, we must measure this in space. The target signal is very small, and can only be seen by very sensitive instruments. However, telescopes in space will be subject to radiation by cosmic rays. We will study the cosmic ray environment of the next missions, and understand the scale of the threat on their data. We will attack the problem using simulations and experiments to develop mitigations and understand how this systematic effect can be overcome.
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| Outline of Final Research Achievements |
During the course of this research project, we have carried out a large number of experiments and simulation tasks relating to evaluating cosmic ray systematic effects in next-generation CMB telescopes. Because it is necessary to measure the CMB at large angular scales, measurements must be taken from space, and telescopes are therefore subject to cosmic radiation. Detectors on such telescopes are very sensitive and are kept at cold temperatures in order to reduce noise and measure the small sky signal very precisely.
In our study, we have produced an end-to-end simulator for evaluating the systematic effects produced by cosmic rays in LiteBIRD. By accounting for the space environment, the thermal response of the focal plane, the electrothermal response of the detectors, and the propagation of time-ordered data into maps, we can find the level of CR effects in order to reduce the severity of them.
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| Academic Significance and Societal Importance of the Research Achievements |
The next generation of cosmology telescopes seeks to measure primordial B-modes, which would provide direct evidence of cosmic inflation, and the human understanding of how we came to exist. This has fundamental impacts on the origins of humanity. The removal of CR effects makes this goal possible.
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