ORCID Profile
0000-0002-4495-571X
Current Organisation
Università degli Studi di Milano-Bicocca Dipartimento di Fisica Giuseppe Occhialini
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Publisher: SPIE
Date: 08-10-2004
DOI: 10.1117/12.551753
Publisher: Springer-Verlag
Date: 2003
DOI: 10.1007/10857580_39
Publisher: EDP Sciences
Date: 2005
DOI: 10.1051/EAS:2005013
Publisher: SPIE
Date: 08-10-2004
DOI: 10.1117/12.551671
Publisher: Elsevier BV
Date: 03-2007
Publisher: EDP Sciences
Date: 2005
DOI: 10.1051/EAS:2005040
Publisher: EDP Sciences
Date: 12-2004
Publisher: Optica Publishing Group
Date: 20-07-2006
DOI: 10.1364/AO.45.005168
Abstract: The instrumental polarization induced by a flat isotropic dielectric slab in microwave frequencies is discussed. We find that, in spite of its isotropic nature, such a dielectric can produce spurious polarization either by transmitting incoming anisotropic diffuse radiation or emitting when it is thermally inhomogeneous. We present evaluations of instrumental polarization generated by materials usually adopted in radio astronomy, by using the Mueller matrix formalism. As an application, results for different slabs in front of a 32 GHz receiver are discussed. Such results are based on measurements of their complex dielectric constants. We evaluate that a 0.33 cm thick Teflon slab introduces negligible spurious polarization (<2.6 x 10(-5) in transmission and <6 x 10(-7) in emission), even minimizing the leakage (<10(-8) from Q to U Stokes parameters, and vice versa) and the depolarization (approximately 1.3 x 10(-3)).
Publisher: SPIE
Date: 08-10-2004
DOI: 10.1117/12.551408
Publisher: Springer Berlin Heidelberg
Date: 08-11-2003
DOI: 10.1007/10857580_65
Publisher: Springer Science and Business Media LLC
Date: 27-01-2020
DOI: 10.1007/S10909-019-02329-W
Abstract: Recent developments of transition-edge sensors (TESs), based on extensive experience in ground-based experiments, have been making the sensor techniques mature enough for their application on future satellite cosmic microwave background (CMB) polarization experiments. LiteBIRD is in the most advanced phase among such future satellites, targeting its launch in Japanese Fiscal Year 2027 (2027FY) with JAXA’s H3 rocket. It will accommodate more than 4000 TESs in focal planes of reflective low-frequency and refractive medium-and-high-frequency telescopes in order to detect a signature imprinted on the CMB by the primordial gravitational waves predicted in cosmic inflation. The total wide frequency coverage between 34 and 448 GHz enables us to extract such weak spiral polarization patterns through the precise subtraction of our Galaxy’s foreground emission by using spectral differences among CMB and foreground signals. Telescopes are cooled down to 5 K for suppressing thermal noise and contain polarization modulators with transmissive half-wave plates at in idual apertures for separating sky polarization signals from artificial polarization and for mitigating from instrumental 1/ f noise. Passive cooling by using V-grooves supports active cooling with mechanical coolers as well as adiabatic demagnetization refrigerators. Sky observations from the second Sun–Earth Lagrangian point, L2, are planned for 3 years. An international collaboration between Japan, the USA, Canada, and Europe is sharing various roles. In May 2019, the Institute of Space and Astronautical Science, JAXA, selected LiteBIRD as the strategic large mission No. 2.
Publisher: EDP Sciences
Date: 04-2003
Publisher: AIP
Date: 2002
DOI: 10.1063/1.1471857
Publisher: AIP
Date: 2002
DOI: 10.1063/1.1471846
Publisher: Elsevier BV
Date: 05-2004
Publisher: SPIE
Date: 02-2003
DOI: 10.1117/12.458896
Publisher: AIP
Date: 2000
DOI: 10.1063/1.1302463
Location: Italy
Location: Italy
No related grants have been discovered for Mario Zannoni.