Light concentrators for Borexino and CTF

L. Oberauer; C. Grieb; F. Von Feilitzsch; I. Manno

doi:10.1016/j.nima.2004.05.095

Light concentrators for Borexino and CTF

L. Oberauer, C. Grieb, F. Von Feilitzsch, I. Manno

Associate Professorship of Experimental Physics and Astroparticle Physics

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Light concentrators for the solar neutrino experiment Borexino and the Counting Test Facility (CTF) have been developed and constructed. They increase the light yield of these detectors by factors of 2.5 and 8.8, respectively. Technical challenges like long-term stability in various media, high reflectivity and radiopurity have been addressed and the concepts to overcome these difficulties will be described. Gamma spectroscopy measurements of the concentrators show an upper limit of 12μBq/g for uranium and a value of 120μBq/g for thorium. Upper limits on other possible contaminations like ²⁶Al are presented. The impact of these results on the performance of Borexino and the CTF are discussed and it is shown that the design goals of both experiments are fulfilled.

Original language	English
Pages (from-to)	453-462
Number of pages	10
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	530
Issue number	3
DOIs	https://doi.org/10.1016/j.nima.2004.05.095
State	Published - 11 Sep 2004

Keywords

Light concentrators
Solar neutrinos

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10.1016/j.nima.2004.05.095

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title = "Light concentrators for Borexino and CTF",

abstract = "Light concentrators for the solar neutrino experiment Borexino and the Counting Test Facility (CTF) have been developed and constructed. They increase the light yield of these detectors by factors of 2.5 and 8.8, respectively. Technical challenges like long-term stability in various media, high reflectivity and radiopurity have been addressed and the concepts to overcome these difficulties will be described. Gamma spectroscopy measurements of the concentrators show an upper limit of 12μBq/g for uranium and a value of 120μBq/g for thorium. Upper limits on other possible contaminations like 26Al are presented. The impact of these results on the performance of Borexino and the CTF are discussed and it is shown that the design goals of both experiments are fulfilled.",

keywords = "Light concentrators, Solar neutrinos",

author = "L. Oberauer and C. Grieb and {Von Feilitzsch}, F. and I. Manno",

note = "Funding Information: This work was supported by the “Bundesministerium f{\"u}r Bildung, Wissenschaft, Forschung und Technologie” (BMBF), the “Deutsche Forschungsgemeinschaft” (DFG), and the “Technischen Universit{\"a}t M{\"u}nchen” (TUM). We acknowledge the technical support from the companies “Klobe&Sohn” (evaporation techniques), “Metalldr{\"u}ckerei Wender” (spinning processes), and “S{\"u}d-Eloxal” (hard anodization of aluminum) . Our special thanks are due to our former colleague Dipl.-Ing. K.H. Schuhbeck. We would like to thank the whole Borexino collaboration, especially L. Cadonati and J. Maneira, for Monte-Carlo calculations, G. Heusser for gamma spectroscopy measurements performed in Heidelberg, and the crews which did a marvellous job installing the PMs and concentrators in Borexino and CTF.",

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AU - Oberauer, L.

AU - Grieb, C.

AU - Von Feilitzsch, F.

AU - Manno, I.

N1 - Funding Information: This work was supported by the “Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie” (BMBF), the “Deutsche Forschungsgemeinschaft” (DFG), and the “Technischen Universität München” (TUM). We acknowledge the technical support from the companies “Klobe&Sohn” (evaporation techniques), “Metalldrückerei Wender” (spinning processes), and “Süd-Eloxal” (hard anodization of aluminum) . Our special thanks are due to our former colleague Dipl.-Ing. K.H. Schuhbeck. We would like to thank the whole Borexino collaboration, especially L. Cadonati and J. Maneira, for Monte-Carlo calculations, G. Heusser for gamma spectroscopy measurements performed in Heidelberg, and the crews which did a marvellous job installing the PMs and concentrators in Borexino and CTF.

PY - 2004/9/11

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N2 - Light concentrators for the solar neutrino experiment Borexino and the Counting Test Facility (CTF) have been developed and constructed. They increase the light yield of these detectors by factors of 2.5 and 8.8, respectively. Technical challenges like long-term stability in various media, high reflectivity and radiopurity have been addressed and the concepts to overcome these difficulties will be described. Gamma spectroscopy measurements of the concentrators show an upper limit of 12μBq/g for uranium and a value of 120μBq/g for thorium. Upper limits on other possible contaminations like 26Al are presented. The impact of these results on the performance of Borexino and the CTF are discussed and it is shown that the design goals of both experiments are fulfilled.

AB - Light concentrators for the solar neutrino experiment Borexino and the Counting Test Facility (CTF) have been developed and constructed. They increase the light yield of these detectors by factors of 2.5 and 8.8, respectively. Technical challenges like long-term stability in various media, high reflectivity and radiopurity have been addressed and the concepts to overcome these difficulties will be described. Gamma spectroscopy measurements of the concentrators show an upper limit of 12μBq/g for uranium and a value of 120μBq/g for thorium. Upper limits on other possible contaminations like 26Al are presented. The impact of these results on the performance of Borexino and the CTF are discussed and it is shown that the design goals of both experiments are fulfilled.

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Light concentrators for Borexino and CTF

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