Background study for the PN-Ccd detector of CERN Axion Solar Telescope

Cebrian, S. (Universidad de Zaragoza) ; Rodriguez, A. ; Kuster, M. ; Beltran, B. ; Gomez, H. (Universidad de Zaragoza) ; Hartmann, R. ; Irastorza, I. G. (Universidad de Zaragoza) ; Kotthaus, R. ; Luzon, G. (Universidad de Zaragoza) ; Morales, J. (Universidad de Zaragoza) ; Ruz, J. (Universidad de Zaragoza) ; Struder, L. ; Villar, J. A. (Universidad de Zaragoza)
Background study for the PN-Ccd detector of CERN Axion Solar Telescope
Resumen: The CERN Axion Solar Telescope (CAST) experiment searches for axions from the Sun converted into photons with energies up to around 10 keV via the inverse Primakoff effect in the high magnetic field of a superconducting Large Hadron Collider (LHC) prototype magnet. A backside illuminated pn-CCD detector in conjunction with an X-ray mirror optics is one of the three detectors used in CAST to register the expected photon signal. Since this signal is very rare and different background components (environmental gamma radiation, cosmic rays, intrinsic radioactive impurities in the set-up, . . . ) entangle it, a detailed study of the detector background has been undertaken with the aim to understand and further reduce the background level of the detector. The analysis is based on measured data taken during the Phase I of CAST and on Monte Carlo simulations of different background components. This study will show that the observed background level (at a rate of (8.00 ± 0.07) × 10-5 counts cm-2 s-1 keV-1 between 1 and 7 keV) seems to be dominated by the external gamma background due to usual activities at the experimental site, while radioactive impurities in the detector itself and cosmic neutrons could make just smaller contribution.
Idioma: Inglés
DOI: 10.1016/j.astropartphys.2007.05.006
Año: 2007
Publicado en: ASTROPARTICLE PHYSICS 28, 2 (2007), 205-215
ISSN: 0927-6505

Factor impacto JCR: 3.483 (2007)
Categ. JCR: PHYSICS, PARTICLES & FIELDS rank: 8 / 24 = 0.333 (2007) - Q2 - T2
Categ. JCR: ASTRONOMY & ASTROPHYSICS rank: 12 / 48 = 0.25 (2007) - Q1 - T1

Financiación: info:eu-repo/grantAgreement/ES/CICYT/FPA2004-00973
Financiación: info:eu-repo/grantAgreement/EUR/RII3/CT-2003-506222
Tipo y forma: Article (PostPrint)
Área (Departamento): Física Atómica, Molecular y Nuclear (Departamento de Física Teórica)

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