International Workshop on Astronomical X–Ray Optics
Prague 2010
Poster details
Photon distribution on the HTRS aboard IXO
Presenter: Christian Schmid
We have studied the photon distribution on the HTRS aboard IXO using a Monte-Carlo simulation that models the path of individual photons in the telescope with some simplifying assumptions. Due to the particular out-of-focus position of the HTRS the photons from an observed X-ray source are not focussed to a sharp spot but are distributed over the entire pixel array in order to improve the bright source performance. The simulation is based on the silicon pore optics design proposed for IXO and the corresponding radial effective area distribution of the mirrors. The data from the simulations have been used to optimize the design of the HTRS with respect to pixel sizes and the out-of-focus distance. With our analysis we show that the HTRS fullfills the imposed requirements with respect to alignment and pointing stability and we have studied the impact of jitter effects on the instrument calibration.
Jörn Wilms, Tim Oosterbroek, Didier Barret, Peter Lechner