Simulation of the optical system in the GroundBIRD telescope

Yonggil Jo; Jihoon Choi; Makoto Hattori; Shunsuke Honda; Tomonaga Tanaka; Miku Tsuji; Eunil Won; Kyungmin Lee

doi:10.1364/AO.488636

Applied Optics
Vol. 62,
Issue 20,
pp. 5369-5378
(2023)
•https://doi.org/10.1364/AO.488636

Simulation of the optical system in the GroundBIRD telescope

Yonggil Jo, Jihoon Choi, Makoto Hattori, Shunsuke Honda, Tomonaga Tanaka, Miku Tsuji, Eunil Won, and Kyungmin Lee

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Yonggil Jo, Jihoon Choi, Makoto Hattori, Shunsuke Honda, Tomonaga Tanaka, Miku Tsuji, Eunil Won, and Kyungmin Lee, "Simulation of the optical system in the GroundBIRD telescope," Appl. Opt. 62, 5369-5378 (2023)

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Abstract

GroundBIRD is a ground-based telescope for measuring the polarization of cosmic microwave background radiation, and it is soon to be operational at the Teide Observatory. The GroundBIRD telescope employs Mizuguchi–Dragone dual reflectors and 161 kinetic inductance detectors coupled with single polarization antennas as photon detectors. We present the results of our optical simulation on the pointing direction, stray light response, and influence of the blackbody radiation from the baffle. We also find that the power of the baffle radiation incident on the detectors is reduced by 99.95% when corrugated feed horns are coupled to the detectors.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Detector #	CMB Source (J/s)	Baffle Source (J/s)	CMB/Baffle Ratio
Detector 0	$5.26 \times 10^{- 13}$	$8.86 \times 10^{- 11}$	0.006
Detector 1	$4.64 \times 10^{- 13}$	$8.38 \times 10^{- 11}$	0.005
Detector 2	$4.55 \times 10^{- 13}$	$2.19 \times 10^{- 10}$	0.002
Detector 3	$4.54 \times 10^{- 13}$	$2.23 \times 10^{- 10}$	0.002
Detector 4	$4.62 \times 10^{- 13}$	$8.51 \times 10^{- 11}$	0.005
Detector 5	$7.34 \times 10^{- 13}$	$5.79 \times 10^{- 11}$	0.01
Detector 6	$7.34 \times 10^{- 13}$	$5.59 \times 10^{- 11}$	0.01

Detector #	CMB Source (J/s)	Baffle Source (J/s)	CMB/Baffle Ratio
Detector 0	$3.42 \times 10^{- 13}$	$1.55 \times 10^{- 14}$	22
Detector 1	$3.39 \times 10^{- 13}$	$1.95 \times 10^{- 14}$	17
Detector 2	$3.35 \times 10^{- 13}$	$1.55 \times 10^{- 13}$	2
Detector 3	$3.34 \times 10^{- 13}$	$1.57 \times 10^{- 13}$	2
Detector 4	$3.38 \times 10^{- 13}$	$1.96 \times 10^{- 14}$	17
Detector 5	$3.39 \times 10^{- 13}$	$2.73 \times 10^{- 15}$	124
Detector 6	$3.39 \times 10^{- 13}$	$2.61 \times 10^{- 15}$	130

Detector #	CMB Source (J/s)	Baffle Source (J/s)	CMB/Baffle Ratio
Detector 0	$5.26 \times 10^{- 13}$	$8.86 \times 10^{- 11}$	0.006
Detector 1	$4.64 \times 10^{- 13}$	$8.38 \times 10^{- 11}$	0.005
Detector 2	$4.55 \times 10^{- 13}$	$2.19 \times 10^{- 10}$	0.002
Detector 3	$4.54 \times 10^{- 13}$	$2.23 \times 10^{- 10}$	0.002
Detector 4	$4.62 \times 10^{- 13}$	$8.51 \times 10^{- 11}$	0.005
Detector 5	$7.34 \times 10^{- 13}$	$5.79 \times 10^{- 11}$	0.01
Detector 6	$7.34 \times 10^{- 13}$	$5.59 \times 10^{- 11}$	0.01

Detector #	CMB Source (J/s)	Baffle Source (J/s)	CMB/Baffle Ratio
Detector 0	$3.42 \times 10^{- 13}$	$1.55 \times 10^{- 14}$	22
Detector 1	$3.39 \times 10^{- 13}$	$1.95 \times 10^{- 14}$	17
Detector 2	$3.35 \times 10^{- 13}$	$1.55 \times 10^{- 13}$	2
Detector 3	$3.34 \times 10^{- 13}$	$1.57 \times 10^{- 13}$	2
Detector 4	$3.38 \times 10^{- 13}$	$1.96 \times 10^{- 14}$	17
Detector 5	$3.39 \times 10^{- 13}$	$2.73 \times 10^{- 15}$	124
Detector 6	$3.39 \times 10^{- 13}$	$2.61 \times 10^{- 15}$	130

Abstract

Data availability

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Figures (13)

Tables (2)

Equations (4)

Applied Optics