Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908915292176384 |
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| author | Tsujii, Miku Tanaka, Tomonaga Fasano, Alessandro Génova-Santos, Ricardo Honda, Shunsuke Jo, Yonggil Kataoka, Keisuke Otani, Chiko Peel, Mike Suzuki, Junya Tajima, Osamu Won, Eunil Hattori, Makoto |
| author_facet | Tsujii, Miku Tanaka, Tomonaga Fasano, Alessandro Génova-Santos, Ricardo Honda, Shunsuke Jo, Yonggil Kataoka, Keisuke Otani, Chiko Peel, Mike Suzuki, Junya Tajima, Osamu Won, Eunil Hattori, Makoto |
| contents | We presented the optimization procedures of the baffle mounted on the GroundBIRD telescope for measuring the polarization of the Cosmic Microwave Background~(CMB). The telescope employs dual mirror reflective telescopes installed in a cryostat. The primary objectives were to minimize stray light contamination, maintain the integrity of the main beam, and ensure that thermal loading from the baffle remains significantly below that from the atmosphere. Using quasi-optical simulations, we have optimized the baffle's aperture angle to suppress stray light without degrading the main beam quality. We confirmed through Moon observations that the optimized baffle design works to eliminate the contamination of the stray light as expected. Furthermore, no measurable degradation in the noise equivalent temperature~(NET) was detected, indicating minimal thermal impact. These results show that our baffle optimization strategy effectively reduces systematic errors while maintaining observational sensitivity, providing valuable insights for future CMB experiments with similar optical architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_22071 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light Tsujii, Miku Tanaka, Tomonaga Fasano, Alessandro Génova-Santos, Ricardo Honda, Shunsuke Jo, Yonggil Kataoka, Keisuke Otani, Chiko Peel, Mike Suzuki, Junya Tajima, Osamu Won, Eunil Hattori, Makoto Instrumentation and Methods for Astrophysics We presented the optimization procedures of the baffle mounted on the GroundBIRD telescope for measuring the polarization of the Cosmic Microwave Background~(CMB). The telescope employs dual mirror reflective telescopes installed in a cryostat. The primary objectives were to minimize stray light contamination, maintain the integrity of the main beam, and ensure that thermal loading from the baffle remains significantly below that from the atmosphere. Using quasi-optical simulations, we have optimized the baffle's aperture angle to suppress stray light without degrading the main beam quality. We confirmed through Moon observations that the optimized baffle design works to eliminate the contamination of the stray light as expected. Furthermore, no measurable degradation in the noise equivalent temperature~(NET) was detected, indicating minimal thermal impact. These results show that our baffle optimization strategy effectively reduces systematic errors while maintaining observational sensitivity, providing valuable insights for future CMB experiments with similar optical architectures. |
| title | Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2509.22071 |