CAST microbulk micromegas in the Canfranc Underground Laboratory

Tomas, A.; Dafni, T.; Papaevangelou, T.; Gardikiotis, A.; Rodríguez, A.; Irastorza, I.G.; Garza, J.G.; Galán, J.; Ruz, J.; Iguaz, F.J.; Herrera, D.C.; García, J.A.; Yildiz, S.C.; Fanourakis, G.; Geralis, T.; Vafeiadis, T.; Aune, S.; Gómez, H.; Seguí, L.; Giomataris, I.; Luzón, G.; Ferrer-Ribas, E.

doi:10.1016/j.phpro.2012.02.399

Article
Report number	arXiv:1208.5690
Title	CAST microbulk micromegas in the Canfranc Underground Laboratory
Author(s)	Tomas, A. ; Aune, S. (IRFU, SPP, Saclay) ; Dafni, T. (Zaragoza U.) ; Fanourakis, G. (Democritos Nucl. Res. Ctr.) ; Ferrer-Ribas, E. (IRFU, SPP, Saclay) ; Galán, J. (Zaragoza U. ; IRFU, SPP, Saclay) ; García, J.A. (Zaragoza U.) ; Gardikiotis, A. (Patras U.) ; Geralis, T. (Patras U.) ; Giomataris, I. (IRFU, SPP, Saclay) Mostrar todos los 22 autores
Publication	2013-07-16
Imprint	29 Aug 2012
Number of pages	5
Note	Comments: 6 pages, 8 figures. To appear in the proceedings of the 2nd International Conference on Technology and Instrumentation for Particle Physics (TIPP 2011) 6 pages, 8 figures. To appear in the proceedings of the 2nd International Conference on Technology and Instrumentation for Particle Physics (TIPP 2011)
In:	Phys. Procedia 37 (2012) 478-482
In:	2nd International Conference on Technology and Instrumentation in Particle Physics, Chicago, IL, USA, 9 - 14 Jun 2011, pp.478-482
DOI	10.1016/j.phpro.2012.02.399
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CAST
Abstract	During the last taking data campaigns of the CAST experiment, the micromegas detectors have achieved background levels of $\approx 5 \times 10^{-6}$ keV $^{-1}$ cm $^{-2}$ s $^{-1}$ between 2 and 9 keV. This performance has been possible thanks to the introduction of the microbulk technology, the implementation of a shielding and the development of discrimination algorithms. It has motivated new studies towards a deeper understanding of CAST detectors background. One of the working lines includes the construction of a replica of the set-up used in CAST by micromegas detectors and its installation in the Canfranc Underground Laboratory. Thanks to the comparison between the performance of the detectors underground and at surface, shielding upgrades, etc, different contributions to the detectors background have been evaluated. In particular, an upper limit $< 2 \times 10^{-7}$ keV $^{-1}$ cm $^{-2}$ s $^{-1}$ for the intrinsic background of the detector has been obtained. This work means a first evaluation of the potential of the newest micromegas technology in an underground laboratory, the most suitable environment for Rare Event Searches.
Copyright/License	publication: © 2012-2025 Elsevier (License: CC-BY-NC-ND-3.0)

$Left: CAST-like test set-up first used in Zaragoza's test bench and later in LSC. Light shielding composed by 2.5 cm of lead with an internal shielding of 0.5 cm of more radiopure copper. The two last lead caps are added after closing the Faraday cage. The set-up is prepared for 6 keV X-Rays automatic calibrations thanks to a $^{55}$Fe source inside the Faraday cage. Right: the same set-up after the later upgrading: a 20 cm thick lead shielding. The liquid nitrogen dewar and the acquisition electronics are shown too.$ $Left: CAST-like test set-up first used in Zaragoza's test bench and later in LSC. Light shielding composed by 2.5 cm of lead with an internal shielding of 0.5 cm of more radiopure copper. The two last lead caps are added after closing the Faraday cage. The set-up is prepared for 6 keV X-Rays automatic calibrations thanks to a $^{55}$Fe source inside the Faraday cage. Right: the same set-up after the later upgrading: a 20 cm thick lead shielding. The liquid nitrogen dewar and the acquisition electronics are shown too.$ Show more plots

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