SOLPEX X-ray polarimeter detector luminescence background calculated using Geant4 simulation software

The SOLPEX experiment is planned to be placed in Roscosmos’ Multipurpose Laboratory Module “NAUKA” on ISS in the second half of 2018. The experiment is design to detect polarization and X-ray spectra of solar flares. Due to very high, few percent, linear polarization detection limit, accurate background estimation and modeling is crucial.

Luminescence background was simulated using Geant4. Additionally, theoretical spectra was modeled in order to simulate full SOLPEX detector response for M5 and X1 solar flare classes.