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Low X-ray background measurements at the Underground Canfranc Laboratory

Published online by Cambridge University Press:  15 February 2012

J. Galán
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ; IRFU, Centre d’Études de Saclay, CEA, Gif-sur-Yvette, France
S. Aune
Affiliation:
IRFU, Centre d’Études de Saclay, CEA, Gif-sur-Yvette, France
T. Dafni
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
G. Fanourakis
Affiliation:
Institute of Nuclear Physics, NCSR Demokritos, Athens, Greece
E. Ferrer-Ribas
Affiliation:
IRFU, Centre d’Études de Saclay, CEA, Gif-sur-Yvette, France
J.A. García
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
A. Gardikiotis
Affiliation:
University of Patras, Patras, Greece
T. Geralis
Affiliation:
Institute of Nuclear Physics, NCSR Demokritos, Athens, Greece
I. Giomataris
Affiliation:
IRFU, Centre d’Études de Saclay, CEA, Gif-sur-Yvette, France
H. Gómez
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
J.G. Garza
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
D.C. Herrera
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
F.J. Iguaz
Affiliation:
IRFU, Centre d’Études de Saclay, CEA, Gif-sur-Yvette, France
I.G. Irastorza
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
G. Luzón
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
T. Papaevangelou
Affiliation:
IRFU, Centre d’Études de Saclay, CEA, Gif-sur-Yvette, France
A. Rodríguez
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
J. Ruz
Affiliation:
CERN, European Organization for Particle Physics and Nuclear Research
L. Seguí
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
A. Tomás
Affiliation:
Grupo de Física Nuclear y Astropartículas, University of Zaragoza, Zaragoza, Spain. e-mail: Javier.Galan.Lacarra@cern.ch ;
T. Vafeiadis
Affiliation:
Institute of Nuclear Physics, NCSR Demokritos, Athens, Greece Aristotle University of Thessaloniki, Thessaloniki, Greece
S.C. Yildiz
Affiliation:
Doğuş University, Istanbul, Turkey Boğaziçi University, Istanbul, Turkey
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Abstract

Micromegas detectors, thanks to their good spatial and temporal discrimination capabilities, are good candidates for rare event search experiments. Recent X-ray background levels achieved by these detectors in the CAST experiment have motivated further studies in the nature of the background levels measured. In particular, different shielding configurations have been tested at the Canfranc Underground Laboratory, using a microbulk type detector which was previously running at the CAST experiment. The first results underground show that this technology, which is made of low radiative materials, is able to reach background levels down to 2 × 10-7 keV-1 s-1 cm-2 with a proper shielding. Moreover, the experimental background measurements are complemented with Geant4 simulations which allow to understand the origin of the background, and to optimize future shielding set-ups.

Type
Research Article
Copyright
© EAS, EDP Sciences 2012

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References

Arik, E., et al. [CAST Collaboration] 2009, JCAP, 0902 008 [arXiv:0810.4482 [hep-ex]]
Aune, S., et al. [CAST Collaboration] 2011 [arXiv :1106.3919], Phys. Rev. Lett., published
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Galán, J., et al., 2010, JINST 5, P01009
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Iguaz, F.J., et al., 2011, TIPP Conference 2011, Physics Procedia, published
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Zioutas, K., et al. [CAST Collaboration] 2005, Phys. Rev. Lett., 94, 121301 [arXiv:hep-ex/0411033] CrossRef

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