Mission design of LiteBIRD

T. Matsumura , Y. Akiba , J. Borrill , Y. Chinone , M. Dobbs , H. Fuke , A. Ghribi , M. Hasegawa

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K. Hattori M. Hattori M. Hazumi W. Holzapfel Y. Inoue K. Ishidoshiro H. Ishino H. Ishitsuka K. Karatsu N. Katayama I. Kawano A. Kibayashi Y. Kibe K. Kimura N. Kimura K. Koga M. Kozu E. Komatsu A. Lee H. Matsuhara S. Mima K. Mitsuda K. Mizukami H. Morii T. Morishima S. Murayama M. Nagai R. Nagata S. Nakamura M. Naruse K. Natsume T. Nishibori H. Nishino A. Noda T. Noguchi H. Ogawa S. Oguri I. Ohta C. Otani P. Richards S. Sakai N. Sato Y. Sato Y. Sekimoto A. Shimizu K. Shinozaki H. Sugita T. Suzuki A. Suzuki O. Tajima S. Takada S. Takakura Y. Takei T. Tomaru Y. Uzawa T. Wada H. Watanabe N. Yamasaki M. Yoshida T. Yoshida K. Yotsumoto

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classification 🌌 astro-ph.IM astro-ph.CO

keywords litebirdachievearraydetectorgoalmeasurementmicrowavemission

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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 (MKID). In this paper we give an overview of LiteBIRD and describe a TES-based polarimeter designed to achieve the target sensitivity of 2~$\mu$K$\cdot$arcmin over the frequency range 50 to 320~GHz.

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