Development of the low frequency telescope focal plane detector modules for LiteBIRD Article Swipe
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· 2022
· Open Access
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· DOI: https://doi.org/10.1117/12.2630574
· OA: W4296604220
LiteBIRD is a JAXA-led strategic large-class satellite mission designed to\nmeasure the polarization of the cosmic microwave background and Galactic\nforegrounds from 34 to 448 GHz across the entire sky from L2 in the late 2020s.\nThe scientific payload includes three telescopes which are called the low-,\nmid-, and high-frequency telescopes each with their own receiver that covers a\nportion of the mission's frequency range. The low frequency telescope will map\nsynchrotron radiation from the Galactic foreground and the cosmic microwave\nbackground. We discuss the design, fabrication, and characterization of the\nlow-frequency focal plane modules for low-frequency telescope, which has a\ntotal bandwidth ranging from 34 to 161 GHz. There will be a total of 4\ndifferent pixel types with 8 overlapping bands to cover the full frequency\nrange. These modules are housed in a single low-frequency focal plane unit\nwhich provides thermal isolation, mechanical support, and radiative baffling\nfor the detectors. The module design implements multi-chroic lenslet-coupled\nsinuous antenna arrays coupled to transition edge sensor bolometers read out\nwith frequency-domain mulitplexing. While this technology has strong heritage\nin ground-based cosmic microwave background experiments, the broad frequency\ncoverage, low optical loading conditions, and the high cosmic ray background of\nthe space environment require further development of this technology to be\nsuitable for LiteBIRD. In these proceedings, we discuss the optical and\nbolometeric characterization of a triplexing prototype pixel with bands\ncentered on 78, 100, and 140 GHz.\n
