LiteBIRD: Lite (Light) satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection


The basic concept of LiteBIRD is as follows:

  1. 1) Design a satellite optimized for CMB polarization B mode detection on large angle scales. Without compromise on sensitivity, verify definitely the focused target.
  2. 2) Design a lightweight, compact satellite without requiring angular resolution of less than 1 degree. This will increase the chance of launch.

Major specifications are shown below:

Item Specification
Observation duration 3 years
Orbit Sun–Earth L2
Cooling system Similarly to pre-cooling method of infrared astronomical satellite SPICA, use radiative cooling and mechanical refrigerators (Stirling and JT) without cryogen. Cool in space after launch. CCDR or ADR is used to cool the focal plane down to 0.1 K.
Focal-plane detector Multi-chroic superconducting detector (TES) array with more than 3000 bolometers
Sensitivity 3 micro-Kelvin x arcmin
Observing frequencies 15 bands between 34 and 448 GHz
Modulation Satellite spin and half-wave-plate modulation

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