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Proceedings Paper

Optimization of the MARS-XRD collimator using converging blades
Author(s): Carlo Pelliciari; Lucia Marinangeli; Fabio Critani; Antonio Baliva; Ian Hutchinson
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Paper Abstract

Mars-XRD is an X-ray diffractometer developed for the in situ mineralogical analysis of the Martian soil. The main components of the Mars-XRD experiment are: a Fe55 radioactive source, a collimator and a CCD-based detector system. For spectroscopic requirements and quality of the machined micrograin of the sample, the beam section should not be larger then 1 × 10 mm2 at sample distance. The current collimator baseline is based on a two-windows system that uses about 20% of the total source emitting surface. To improve the X-ray flux, we are studying a collimator with converging blades which permits to use the entire source emission and tune the beam section. In order to better estimate the efficiency of this collimator and because of the high number of variables, a C++ program has been written that look for the best blades configuration among billion of combinations. In addition to the collimator configuration, this software simulator gives the sample photons distribution for different angles of the tilt of the source and for each couple of blades. The optimized collimator transmits a flux 30% higher than a system with blades with the same angular aperture and 5 times higher than a two windows collimator. Moreover the target photon distribution is a triangle function well focused on the sample surface instead of an irregular function obtained with the previous system. Higher performances arise with the source perpendicular to the source-sample direction. Thanks to this optimization we expect to strongly improve the resolution of the diffraction pattern which is the main goal of the current activities of the instrument development. This software simulator could be used also for the optimization of collimator system for the other wavelength and applications (e.g. radiotherapy).

Paper Details

Date Published: 4 May 2011
PDF: 12 pages
Proc. SPIE 8076, EUV and X-Ray Optics: Synergy between Laboratory and Space II, 80760U (4 May 2011); doi: 10.1117/12.890279
Show Author Affiliations
Carlo Pelliciari, Univ. d'Annunzio di Pescara (Italy)
Lucia Marinangeli, Univ. d'Annunzio di Pescara (Italy)
Fabio Critani, Univ. d'Annunzio di Pescara (Italy)
Antonio Baliva, Univ. d'Annunzio di Pescara (Italy)
Ian Hutchinson, Univ. of Leicester (United Kingdom)

Published in SPIE Proceedings Vol. 8076:
EUV and X-Ray Optics: Synergy between Laboratory and Space II
René Hudec; Ladislav Pina, Editor(s)

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