Researchers Demonstrate Improved Microcalorimeter Detectors for Hot Universe Baryon Surveyor Mission
Scientists have successfully tested small-area transition-edge sensor (TES) microcalorimeters designed for the Hot Universe Baryon Surveyor (HUBS) space mission, achieving energy resolutions as good as 3.8 eV at 5.9 keV. The detectors use molybdenum/copper transition-edge sensors coupled to gold absorbers and were characterized using both pulsed laser and radioactive source testing. This progress in detector technology is important for enabling HUBS to conduct sensitive observations of hot gas in the universe.
Researchers have reported progress on microcalorimeter detector development for the Hot Universe Baryon Surveyor (HUBS) mission, a planned space observatory. The team tested individual pixels within a 10×10 microcalorimeter array based on molybdenum/copper transition-edge sensors coupled to gold absorbers. Initial characterization using a pulsed laser system producing 3 eV photons demonstrated that individual photon peaks could be easily resolved. Subsequent exposure to radiation from an iron-55 source showed energy resolutions reaching 3.8±0.2 eV at 5.9 keV across tested pixels. The researchers found that energy resolution varied monotonically with bias point and showed minimal excess noise, consistent with noise spectrum modeling. Thermal crosstalk between pixels was identified as a remaining challenge affecting energy resolution performance.
What's missing
The study does not discuss the timeline for HUBS mission launch, the full specifications of the complete detector array, or how these energy resolution values compare to competing detector technologies or previous generations of TES microcalorimeters.
What different sources said
- arXiv astro-phCenter
Detector Development for HUBS I: Initial Testing of Small-Area TES Microcalorimeters
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