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Mission Design of LiteBIRD


LiteBIRD is a next-generation satellite mission to measure the polarization of the cosmic microwave background (CMB) radiation. On large angular scales the B-mode polarization of the CMB carries the imprint of primordial gravitational waves, and its precise measurement would provide a powerful probe of the epoch of inflation. The goal of LiteBIRD is to achieve a measurement of the characterizing tensor to scalar ratio \(r\) to an uncertainty of \(\delta r=0.001\). In order to achieve this goal we will employ a kilo-pixel superconducting detector array on a cryogenically cooled sub-Kelvin focal plane with an optical system at a temperature of 4 K. We are currently considering two detector array options; transition edge sensor (TES) bolometers and microwave kinetic inductance detectors. In this paper we give an overview of LiteBIRD and describe a TES-based polarimeter designed to achieve the target sensitivity of 2 \(\upmu \)K arcmin over the frequency range 50–320 GHz.

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This work is supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan under KAKENHI Grant Numbers 21111002, 21111003, 24111715, 24740182.

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Correspondence to T. Matsumura.

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Matsumura, T., Akiba, Y., Borrill, J. et al. Mission Design of LiteBIRD. J Low Temp Phys 176, 733–740 (2014).

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  • Cosmic microwave background radiation
  • B-mode polarization
  • Inflation
  • Transition edge sensor bolometer for space application