XMM Users' Handbook

   
OSim - The OM Simulator

OSim is a partly independent simulator, because the OM has its own telescope. The commonality with the other subunits of SciSim is only in the relative alignment of the different telescopes with respect to each other on the spacecraft.

OSim contains the optical/UV ray tracer and it simulates the behaviour of the detector itself. The following features are currently supported:

• Imaging (coordinate transformation) by telescope

• Count rate calculation for each pixel

• Sky background

• Source spectra

• Gaussian PSF of optics

• Reflectivity of primary and secondary mirrors

• Reflectivity of selector (tertiary mirror)

• Transmission of various filters

• Magnification by magnifier

• Transmission of magnifier

• Transmission of detector window

• Photocathode quantum efficiency

• FWHM of detector

• Pixel sampling

Additional features are planned for the next release of OSim.