POLAR is a compact wide field space-borne detector dedicated for precisemeasurements of the linear polarization of hard X-rays emitted by transientsources in the energy range from 50 keV to 500 keV. It consists of 1600 plasticscintillator bars grouped in 25 detector modules that are used as gamma-raydetection material. Its energy range sensitivity is optimized for detection ofthe prompt emission photons from the gamma-ray bursts. Measurements of the GRBpolarization provide unique information on emission mechanisms as well as oncomposition and structure of the GRB jets. The POLAR instrument was developedby international collaboration of Switzerland, China and Poland. It waslaunched in space on-board the China Space Laboratory TG-2 on September 15th,2016. Based on the ground calibration data, several high voltage and thresholdsettings were calculated and verified in order to obtain various energy rangesand optimized signal to background conditions for different measurementpurposes. In this paper we present optimization procedure details and currenttest results.
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