Seminari vincitori procedure selettive RTDA FIS05 02C1 codici concorso n. 94/2020 e 95/2020
Si terrà alle ore 12.00 in videoconferenza meet il seminario del Dr, Alessandro Coppolecchia
Al seminario si potrà assistere collegandosi al seguente link di meet:
Titolo: Cryogenics challenges for Cosmic Microwave Background
The measurement of the polarization of the Cosmic Microwave Background
is one of current frontiers in cosmology. The detection B-modes in the
polarization pattern of the Cosmic Microwave Background would provide
important information on the early Universe, confirming the cosmological
inflation scenario. This measurement requires large arrays of low-temperature
detectors operating at mm wavelengths. Photon–noise–limited performance
can be achieved by reducing the photon background on the detectors,
the noise of the readout electronics and the intrinsic noise of the detectors.
Special cryogenic systems are required to achieve these goals. The instrument
must be operated in a harsh environment (either high mountain, or even space - balloon or satellite).
The entire optical system must be cooled at cryogenic temperatures,
and the detectors at sub–K temperatures, for the entire duration of the measurements.
I'll focus on the SWIPE instrument of the Large Scale Polarization Explorer mission (LSPE)
and describe its cryogenic challenges and solutions, to be implemented in the forthcoming years of my activity.
low temperature detectors, scalable to form large arrays. Kinetic Inductance Detectors are superconductor detectors, easily replicable in large arrays
(up to thousands of pixels), intrinsically multiplexable, and represent a very promising technology. I will discuss the development of such technology
for the MISTRAL experiment. MISTRAL will be a cryogenic W-band camera to be integrated at the Gregorian focus of the 64 m aperture Sardinia Radio
Telescope, and it will be available to the radio-astronomy community allowing to perform high-resolution continuum surveys of the mm-wave sky with a variety
of scientific targets, from solar system science to Sunyaev-Zel'dovich effect.