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J. N. Ullom

Researcher at National Institute of Standards and Technology

Publications -  50
Citations -  878

J. N. Ullom is an academic researcher from National Institute of Standards and Technology. The author has contributed to research in topics: Transition edge sensor & Spectrometer. The author has an hindex of 15, co-authored 50 publications receiving 721 citations. Previous affiliations of J. N. Ullom include Arizona State University & Northwestern University.

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Journal ArticleDOI

Updated design of the CMB polarization experiment satellite LiteBIRD

Hajime Sugai, +218 more
TL;DR: LiteBIRD as discussed by the authors is a large-scale transition-edge sensors (TES) mission with a total wide frequency coverage between 34GHz and 448GHz, targeting its launch in Japanese Fiscal Year 2027 (2027FY) with JAXA's H3 rocket, which will accommodate more than 4000 TESs in focal planes of reflective low-frequency and refractive medium-and high-frequency telescopes.
Journal ArticleDOI

Optimized transition-edge x-ray microcalorimeter with 2.4eV energy resolution at 5.9keV

TL;DR: In this article, a series of transition-edge x-ray microcalorimeters designed for optimal energy resolution were used to control the sharpness of the superconducting-to-normal transition.
Journal ArticleDOI

Array-compatible transition-edge sensor microcalorimeter γ-ray detector with 42 eV energy resolution at 103 keV

TL;DR: In this article, a microcalorimeter γ-ray detector with measured energy resolution of 42eV full width at half maximum for 103keV photons is described. But the results of a detailed characterization of the detector, which includes measurements of the complex impedance, detector noise, and time-domain pulse response, suggest that a deeper understanding and optimization of the thermal transport between the absorber and thermometer could significantly improve the energy resolution.
Proceedings ArticleDOI

LiteBIRD: JAXA's new strategic L-class mission for all-sky surveys of cosmic microwave background polarization

Masashi Hazumi, +235 more
TL;DR: LiteBIRD as discussed by the authors, the Lite (Light) satellite for the study of B-mode polarization and inflation from cosmic background radiation detection, is a space mission for primordial cosmology and fundamental physics.