BaR-SPOrt (Balloon-borne Radiometers for Sky Polarisation
Observations) is an experiment to measure the linearly polarized
emission of sky patches at 32 and 90 GHz with sub-degree angular
resolution. It is equipped with high sensitivity correlation
polarimeters for simultaneous detection of both the U and Q stokes
parameters of the incident radiation. On-axis telescope is used to
observe angular scales where the expected polarization of the
Cosmic Microwave Background (CMBP) peaks. This project shares most
of the know-how and sophisticated technology developed for the
SPOrt experiment onboard the International Space Station. The
payload is designed to flight onboard long duration stratospheric
balloons both in the Northern and Southern hemispheres where low
foreground emission sky patches are accessible. Due to the
weakness of the expected CMBP signal (in the range of microK),
much care has been spent to optimize the instrument design with
respect to the systematics generation, observing time efficiency
and long term stability. In this contribution we present the
instrument design, and first tests on some components of the 32
GHz radiometer.

The BaR-SPOrt experiment

We present results of measurements of the spectral index of the Galactic Diffuse emission (GDE), an information essential to evaluate the contamination of measured properties of the CMB by foregrounds.

The Spectral Index of the Galactic Foreground Affecting CMB Measurements

The uncertainty on the temperature of the Cosmic Microwave Background (CMB) measured below 1 GHz is larger than 30%. To improve our knowledge it is necessary to perform measurements at different wavelengths and directions, to disentangle the various components of the antenna temperature (CMB, Galaxy, unresolved sources, atmosphere, ground). In this contribution we briefly describe the apparatus of TRIS EXPERIMENT, the observation strategy, calibration techniques and results of extensive tests.

TRIS Experiment: A Search for Spectral Distortions in the CMB Spectrum Close to 1 GHz

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TRIS Experiment: A Search for Spectral Distortions in the CMB Spectrum Close to 1 GHz