12–17 Oct 2015
Trieste - Italy
Europe/Rome timezone

Investigations of Kr-Xe mixtures in gas avalanche detectors

13 Oct 2015, 16:00
1m
Oceania (Trieste - Italy)

Oceania

Trieste - Italy

Congress Centre Stazione Marittima Molo Bersaglieri, 3 34123 Trieste Italy
Board: 19
Poster MPGD Detector Physics Poster session & coffee break

Speaker

Prof. João Veloso (University of Aveiro)

Description

Recent investigations with a gaseous avalanche micropatterned detector operating in Kr-Xe mixtures will be presented. The use of such mixtures allows to keep a minimal position resolution over a wide X-ray energy range [1]. Measurements and simulations of the gain, energy and position resolution variation according to the Xenon mixture concentration will be presented. Our first results using a THCOBRA [2], measured and calculated, indicate a gain increase with the increase of Xe concentration. Calculation of the number of primary electrons and W value for such mixtures will be also presented. The performance of the THCOBRA detector using different mixtures will be compared to the calculated results with a discussion of the possible deviations. Also, details on the gas purification system will be present. The experimental results were obtained by using a 55Fe providing 5.96 keV photons while the calculations were performed by using Degrad software [3]. The detector, irradiated with an X-ray tube to produce image acquisition and its application on Computed Tomography applications will be discussed [4]. A discussion and results comparison with Kr and Xe pure will be presented. [1] C. D. R. Azevedo et al., Phys. Lett. B, vol. 741, no. 0, pp. 272–275, 2015. [2] A. L. M. Silva et al., NSS/MIC,IEEE, 2012, pp. 1160–1164 [3] S. Biagi, “Degrad.” [Online]. Available: http://consult.cern.ch/writeup/magboltz/. [4] L. F. N. D. Carramate et al., NSS/MIC, IEEE, 2012, pp. 3664–3666.

Primary author

Dr A. L. M. Silva (I3N – Department of Physics, University of Aveiro, Portugal)

Co-authors

Dr C. D. R. Azevedo (I3N – Department of Physics, University of Aveiro, Portugal) Ms Iolanda Fortes (I3N – Department of Physics, University of Aveiro, Portugal) Dr J. F. C. A. Veloso (I3N – Department of Physics, University of Aveiro, Portugal)

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