The Q&U Bolometric Interferometer for Cosmology (QUBIC): a new way to study the primordial Universe

by Michel Piat (Paris Diderot University)

Tuesday Jan 28, 2025, 12:00 PM → 1:00 PM US/Pacific

Auditorium (B50)

Recording: available after event

 

 

Abstract: 

QUBIC (Q & U Bolometric Interferometer for Cosmology) is an international ground-based experiment designed to measure the polarized fluctuations of the millimeter sky and especially the Cosmic Microwave Background (CMB).  It combines cryogenic bolometric detection with interferometry, providing high sensitivity and control of systematic errors. The instrument is currently in commissioning in the Argentine Andes to benefit from excellent atmospheric conditions for millimeter-wave observations.

After a description of the QUBIC instrument and its design, I will present the major results of the first characterization phases, with a focus on the detectors and readout system based on NbSi Transition Edge Sensors (TESs) cooled to 320mK. The perspective of spectro-imaging will also be described, which could represent a significant breakthrough in the field.

 

 

Speaker bio:

Michel Piat is a French astrophysicist and professor specializing in cosmology and instrumentation. He has worked on major Cosmic Microwave Background (CMB)  projects, including Planck-HFI, QUBIC, and is now involved in CMB-S4. He has expertise in cryogenic detectors, millimeter-wave optics, and precision measurements. Michel has also contributed to several satellite proposals like PRISM and CORE. As a professor and researcher, he develops instruments to study the universe’s early structure while mentoring young scientists.