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We present the results of a study on the impact of particles of galactic(GCR) and solar origin for the X-ray Microcalorimeter Spectrometer (XMS) aboardan astronomical satellite flying in an orbit at the second Lagrangian point(L2). The detailed configuration presented in this paper is the one adopted forthe International X-Ray Observatory (IXO) study, however the derived estimatescan be considered a conservative limit for ATHENA, that is the IXO redefinedmission proposed to ESA. This work is aimed at the estimate of the residualbackground level expected on the focal plane detector during the missionlifetime, a crucial information in the development of any instrumentalconfiguration that optimizes the XMS scientific performances. We used theGeant4 toolkit, a Monte Carlo based simulator, to investigate the rejectionefficiency of the anticoincidence system and assess the residual background onthe detector.

Estimate of the impact of background particles on the X-Ray Microcalorimeter Spectrometer on IXO