GroundBIRD is a ground-based experiment for the precise observation of the polarization of the cosmic microwave background (CMB). To achieve high sensitivity at large angular scale, we adopt three features in this experiment: fast rotation scanning, microwave kinetic inductance detector (MKID) and cold optics. The rotation scanning strategy has the advantage to suppress 1/f noise. It also provides a large sky coverage of 40\%, which corresponds to the large angular scales of l∼6. This allows us to constrain the tensor-to-scalar ratio by using low l B-mode spectrum. The focal plane consists of 7 MKID arrays for two target frequencies, 145 GHz and 220 GHz band. There are 161 pixels in total, of which 138 are for 144 GHz and 23 are for 220 GHz. This array is currently under development and the prototype will soon be evaluated in telescope. The GroundBIRD telescope will observe the CMB at the Teide observatory. The telescope was moved from Japan to Tenerife and is now under test. We present the status and plan of the GroundBIRD experiment.
@article{arxiv.2011.07705,
title = {GroundBIRD : A CMB polarization experiment with MKID arrays},
author = {Kyungmin Lee and Jihoon Choi and Ricardo Tanausú Génova-Santos and Makoto Hattori and Masashi Hazumi and Shunsuke Honda and Takuji Ikemitsu and Hidesato Ishida and Hikaru Ishitsuka and Yonggil Jo and Kenichi Karatsu and Kenji Kiuchi and Junta Komine and Ryo Koyano and Hiroki Kutsuma and Satoru Mima and Makoto Minowa and Joonhyeok Moon and Makoto Nagai and Taketo Nagasaki and Masato Naruse and Shugo Oguri and Chiko Otani and Michael Peel and Rafael Rebolo and José Alberto Rubiño-Martín and Yutaro Sekimoto and Junya Suzuki and Tohru Taino and Osamu Tajima and Nozomu Tomita and Tomohisa Uchida and Eunil Won and Mitsuhiro Yoshida},
journal= {arXiv preprint arXiv:2011.07705},
year = {2020}
}
Comments
7 pages, 5 figures, LTD18 proceeding, Published in JLTP