Monte Carlo simulations and generation of the SPI response
von Kienlin, A.; Shrader, C. R.; Schanne, S.; Cordier, B.; Wunderer, C. B.; Diehl, R.; Teegarden, B. J.; Jean, P.; Sturner, S. J.; Weidenspointner, G.; Skinner, G.; Attié, D.; Sizun, P.; Ferguson, C.; Paul, Ph.; Sánchez, F.
United States, France, Germany, United Kingdom, Spain
Abstract
In this paper we discuss the methods developed for the production of the INTEGRAL/SPI instrument response. The response files were produced using a suite of Monte Carlo simulation software developed at NASA/GSFC based on the GEANT-3 package available from CERN. The production of the INTEGRAL/SPI instrument response also required the development of a detailed computer mass model for SPI. We discuss our extensive investigations into methods to reduce both the computation time and storage requirements for the SPI response. We also discuss corrections to the simulated response based on our comparison of ground and inflight calibration data with MGEANT simulations.
Based on observations with INTEGRAL, an ESA project with instruments and science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.