Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)

Kohji Takimoto; Seung-Cheol Bang; Priyadarshini Bangale; James J. Bock; Asantha Cooray; Kenta Danbayashi; Richard M. Feder; Masaki Furutani; Kevin Gates; Ryo Hashimoto; Viktor Hristov; Arisa Kida; Phillip Korngut; Alicia Lanz; Dae-Hee Lee; Lunjun Liu; Peter Mason; Toshio Matsumoto; Shuji Matsuura; Jodi-Ann Morgan; Chi H. Nguyen; Won-Kee Park; Dorin Patru; James Parkus; Shohta Sakai; Kei Sano; Hiroko Suzuki; Aoi Takahashi; Sohta Tatsu; Kohji Tsumura; Takehiko Wada; Shiang-Yu Wang; Yasuhiro Yamada; Michael Zemcov

doi:10.1117/12.2561917

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13 December 2020 Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)

Kohji Takimoto, Seung-Cheol Bang, Priyadarshini Bangale, James J. Bock, Asantha Cooray, Kenta Danbayashi, Richard M. Feder, Masaki Furutani, Kevin Gates, Ryo Hashimoto, Viktor Hristov, Arisa Kida, Phillip Korngut, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Jodi-Ann Morgan, Chi H. Nguyen, Won-Kee Park, Dorin Patru, James Parkus, Shohta Sakai, Kei Sano, Hiroko Suzuki, Aoi Takahashi, Sohta Tatsu, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov

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Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114435A (2020) https://doi.org/10.1117/12.2561917
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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Abstract

The total integrated emission from galaxies, known as the Extragalactic Background Light (EBL), is an important observable for understanding the history of star formation over the history of the universe. Spatial fluctuations in the infrared EBL as measured by the Cosmic Infrared Background ExpeRiment (CIBER), Spitzer and AKARI exceed the predicted signal from galaxy clustering alone. The CIBER-2 project seeks to extend CIBER observa- tions of the EBL throughout the near infrared into the optical, through measurements above Earth's atmosphere during a suborbital sounding rocket flight. The experiment has a LN2-cooled 28.5 cm Cassegrain telescope along with three optical paths and dichroic beamsplitters, which are used to obtain three wide-field images in six broad spectral bands between 0.5-2.0 μm. The three focal planes also contain linear variable filters (LVFs) which simultaneously take spectra with resolution R=20 across the same range. CIBER-2 is scheduled to y multiple times on a Black Brant IX sounding rocket from White Sands Missile Range in the New Mexico desert. For the first flight, scheduled for early 2021, we have completed a variety of pre-flight optical tests, which we use to make focus adjustments, spectral response measurements, and absolute photometric calibrations. In this paper, we describe the methods behind these tests and present their results for pre-flight performance evaluation. In particular, we present measurements of the PSF for each broad spectral band, along with absolute calibration factors for each band and the LVF. Through monochromator scans, we also measure the spectral responsivity of each LVF as a function of position.

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Kohji Takimoto, Seung-Cheol Bang, Priyadarshini Bangale, James J. Bock, Asantha Cooray, Kenta Danbayashi, Richard M. Feder, Masaki Furutani, Kevin Gates, Ryo Hashimoto, Viktor Hristov, Arisa Kida, Phillip Korngut, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Jodi-Ann Morgan, Chi H. Nguyen, Won-Kee Park, Dorin Patru, James Parkus, Shohta Sakai, Kei Sano, Hiroko Suzuki, Aoi Takahashi, Sohta Tatsu, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, and Michael Zemcov "Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114435A (13 December 2020); https://doi.org/10.1117/12.2561917

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