POLAR: the first dedicated gamma-ray burst polarization experiment
2012
POLAR is a Gamma-Ray Burst (GRB) polarization experiment in the energy range 50-500 keV. Detection
principle of the gamma-ray polarization is based on the anisotropy of the Compton scattering. POLAR consists
of 1600 low-Z plastic scintillator bars, read out by 25 flat-panel multianode photomultipliers. Simulations and
experiments have shown that the polarization degree and angle can be retrieved from the modulation curves
with the required accuracy. POLAR can reach a minimum detectable polarization of about 10%(3-sigma level)
for several strongest GRB detections per year. Construction and assembly of the Qualification Model (QM) are
ongoing, in view of a flight onboard of the Chinese Spacelab TG-2 scheduled for 2014.
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