A polarized infrared calibration bench for the B-BOP bolometric camera working at 50 mK

B-BOP is a highly sensitive polarimetric camera for probing the cold magnetized Universe within the SPICA mission. It is equipped with three cryogenic arrays of polarization sensitive bolometers operating at 50 mK representing more than 1300 bolometric pixels in total. Each array is specifically dedicated to a sub-mm spectral band (respectively 70, 180 and 350 micrometers). This poster is focusing on the realization of a detector test bench and a calibration polarized source limiting the noise equivalent power to an ultimate level in the range of 10−18 W⋅Hz−1/2 (attoWatt per square root of Hz). The scientific motivations, the B-bop instrument, the detectors characteristics and required specifications will be presented as guide lines for the design of the test bench and the polarized infrared calibration source. These latter designs will be described in details.