Source position determination method of multiplexing lobster-eye optics

Keisuke Uchiyama; Toru Tamagawa; Tatehiro Mihara; Yuanhui Zhou; Yuichiro Ezoe; Masaki Numazawa; Daiki Ishi; Ryota Otsubo; Aoto Fukushima; Tatsuya Yuasa; Hikaru Suzuki; Tomoki Uchino; Sae Sakuda; Kumi Ishikawa

doi:10.1117/12.2560427

13 December 2020 Source position determination method of multiplexing lobster-eye optics

Keisuke Uchiyama, Toru Tamagawa, Tatehiro Mihara, Yuanhui Zhou, Yuichiro Ezoe, Masaki Numazawa, Daiki Ishi, Ryota Otsubo, Aoto Fukushima, Tatsuya Yuasa, Hikaru Suzuki, Tomoki Uchino, Sae Sakuda, Kumi Ishikawa

Author Affiliations +

Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray; 114447E (2020) https://doi.org/10.1117/12.2560427
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The source position determination method of the multiplexing lobster-eye optics (MuLE), which is a newly proposed configuration of the Lobster-Eye (LE) optics to reduce the number of focal plane detectors significantly, was developed. In the MuLE configuration, X-rays came from different field-of-views (FoVs) were focused on a single imager. To separate the multiplexed FoVs, the optics was designed so that cross-like responses of LE mirror in different FoVs had different azimuthal rotation angles. In this paper, we show the method to determine the rotation angles and verify the FoV discrimination power by using a ray tracing simulation. The configuration we assumed in the simulation was nine multiplexed FoVs projecting onto a single imager (nine-segment MuLE optics) with a 30 cm focal length and a 9×9 cm² effective area of each LE segment. One LE segment covers 9.6°× 9.6° FoV and the total FoV of the nine-segment MuLE configuration was 9 times of that. Our method provided 100% correct FoV discrimination at the 5σ detection limit flux (35–70 mCrab) for a transient source with a duration of 100 s except for the edge of the FoV.

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Keisuke Uchiyama, Toru Tamagawa, Tatehiro Mihara, Yuanhui Zhou, Yuichiro Ezoe, Masaki Numazawa, Daiki Ishi, Ryota Otsubo, Aoto Fukushima, Tatsuya Yuasa, Hikaru Suzuki, Tomoki Uchino, Sae Sakuda, and Kumi Ishikawa "Source position determination method of multiplexing lobster-eye optics", Proc. SPIE 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray, 114447E (13 December 2020); https://doi.org/10.1117/12.2560427

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