Characterization of NbSi TES Bolometers: Preliminary Results

We present preliminary results on characterisation of voltage biased superconducting bolometers with an NbSi alloy sensor. I(V) curves as well as complex impedance and noise measurements are carried out in a dilution fridge with a pulse tube as a first stage cooler. SQUIDs polarization and addressing are controlled by a cold ASIC in which a SiGe amplifier has been implemented. First characterisations were done on full membrane bolometers and show a noise level of about \(10^{-16}\ \mathrm{W}/\sqrt{\mathrm{Hz}}\). Those detectors are developed for the QUBIC experiment, a B-modes telescope that will be deployed in Antactica in 2013.