Fabrication of low frequency detector arrays with integrated cosmic ray mitigation structures for the LiteBIRD CMB experiment

Christopher R. Raum; Shawn Beckman; Nicole Farias; Tommaso Ghigna; Nils Halverson; Masashi Hazumi; Johannes Hubmayr; Greg Jaehnig; Adrian T. Lee; Samantha Stever; Aritoki Suzuki; Keith L Thompson; Ben Westbrook

doi:10.1117/12.3018488

24 August 2024 Fabrication of low frequency detector arrays with integrated cosmic ray mitigation structures for the LiteBIRD CMB experiment

Christopher R. Raum, Shawn Beckman, Nicole Farias, Tommaso Ghigna, Nils Halverson, Masashi Hazumi, Johannes Hubmayr, Greg Jaehnig, Adrian T. Lee, Samantha Stever, Aritoki Suzuki, Keith L Thompson, Ben Westbrook

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309275 (2024) https://doi.org/10.1117/12.3018488
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The LiteBIRD experiment is an international spaceborne telescope, led by JAXA, to observe cosmic microwave background (CMB) radiation. The instrument will be deployed to measure and characterize the signature of the primordial gravitational waves from cosmic inflation in the B-mode polarization of the CMB radiation. These observations and measurements will take place over 15 separate bands in the range of 34 to 448 GHz. This paper will describe the process flow developed to fabricate the lowest bands of the detectors, namely in the range of 34 to 99 GHz. The detector wafer itself will be further divided into two process flows - one covering the cosmic ray mitigation structures and the other describing the trichroic polarization sensitive sinuous antenna, coupled to the transition-edge sensor (TES) detectors fabricated on the device side of the wafer. Building on the process flow previously developed for detector wafers in the adjacent higher low-frequency bands, these wafers will also incorporate Pd based cosmic ray mitigation structures, of different thicknesses, on both the skyside and device side.

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Christopher R. Raum, Shawn Beckman, Nicole Farias, Tommaso Ghigna, Nils Halverson, Masashi Hazumi, Johannes Hubmayr, Greg Jaehnig, Adrian T. Lee, Samantha Stever, Aritoki Suzuki, Keith L Thompson, and Ben Westbrook "Fabrication of low frequency detector arrays with integrated cosmic ray mitigation structures for the LiteBIRD CMB experiment", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309275 (24 August 2024); https://doi.org/10.1117/12.3018488

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