The low radioactivity link of the CUORE experiment

Year: 2009

Authors: Andreotti E., Arnaboldi C., Barucci M., Brofferio C., Cosmelli C., Calligaris L., Capelli S., Clemenza M., Maiano C., Pellicciari M., Pessina G., Pirro S.

Autors Affiliation: Ist Nazl Fis Nucl, Sez Milano Bicocca, I-20126 Milan, Italy; Univ Milano Bicocca, Dipartimento Fis, I-20126 Milan, Italy; Univ Insubria, Dipartimento Matemat & Fis, I-22100 Como, Italy; Univ Florence, Dipartimento Fis, I-50125 Florence, Italy Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

Abstract: CUORE will be an array of 988 TeO(2) bolometers (5 x 5 x 5 cm(3)) held at about 10 mK. It will study the very rare double beta decay process from (130)Te. The electrical connections of the array to the room temperature electronics will consist in about 2000 wires. We will describe the design and characterization of the 3 interconnection sectors going from the detectors to the mixing chamber, the coldest stage at which the array is thermally and mechanically anchored, and from the mixing chamber to room temperature. The lower part consists of a set of 2.3 m long, 50 mu m thick, Cu-insulator tapes having PEN (Polyethylene 2.6 Naphthalate) substrate, on which a pattern of copper tracks are etched. The differential layout pattern chosen allows obtaining a signal cross talk between adjacent channels of about 0.024%, together with a capacitance of about 26 pF/m and a resistance larger than 200 G Omega/m. On the top of the mixing chamber, Cu-Kapton boards are used to join the tapes to the second upward-going 2 m long links, implemented with twisted NbTi wires, interwoven in a NOMEX (R) texture. NbTi-NOMEX link features about 100 pF/m and negligible level of cross-talk. The radioactivity content of Cu-PEN tapes, Cu-Kapton boards, NbTi-NOMEX ribbons and connectors has been investigated and found to be compliant with the experimental requirements. A mechanical study has been done to quote the vibration transmission properties of the highly packaged tapes.

Journal/Review: JOURNAL OF INSTRUMENTATION

Volume: 4      Pages from: P09003  to: P09003

More Information: We are indebted to Ing. Sandro Pigato and Ms. Eugenia Fornaro of Tecnomec: their invaluable support was essential for the realization of the presented set- up. We thank Mr. A. De Lucia for his accurate layout of the PEN and Kapton based circuit designs. This work was partially supported by the Italian Ministry for University and Research, under contract 2006028149_003
KeyWords: Adjacent channels; Cryogenic detectors; Detector design; Electrical connection; Experimental requirements; Low-radioactivity; Thermal model; Vibration transmission, Crosstalk; Cryogenics; Detectors; Electric connectors; Mixing; Polyimides; Radiation; Vibrations (mechanical); Wire, Radioactivity
DOI: 10.1088/1748-0221/4/09/P09003

Citations: 16
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