[astroseminar at Sapienza] 11/12/2017 at 16:00: Alessandro Schillaci

[Elia Battistelli]

Title: BICEP-Array: the next stage of CMB degree angular scale 
observations
Speaker:  Alessandro Schillaci
Institution: California Institute of Technology
Date: Monday, 11 December 2017
Time: 4:00pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract:
	BICEP Array, the Stage-3 instrument of the BICEP/Keck program, 
comprises four multi-frequency telescopes that will be deployed at the 
South Pole Station between 2018-2021. The 4 receivers  will observe 
simultaneously the degree-scale polarization of the Cosmic  Microwave 
Background and its Galactic foregrounds, ultimately improving the 
sensitivity to the primordial B-mode signal by one order of magnitude 
over the current most stringent limits (BK14).
	The 1st receiver, which is currently being built, will operate at 30 
and 40GHz to constrain the synchrotron foreground in the BK sky patch.  
It will be followed by the 95GHz  and the 150GHz receivers and completed 
by the 220/270GHz receiver, bringing the total count of 
background-limited detectors to about  40,000. In this talk, I will 
present an overview of the instrument,  focusing on the ongoing 30/40GHz 
receiver development, and particularly on the improvements on its 
thermal filtering, magnetic shielding, focal plane and detector design. 
I will also show the predicted constraints on the synchrotron foreground 
that this first low-frequency receiver will bring after 1+ years of 
science operations.

web: https://agenda.infn.it/conferenceDisplay.py?confId=14553