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Design improvements to cables and connectors in the Majorana Demonstrator

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arxiv 1712.03459 v1 pith:HQH6C7P4 submitted 2017-12-10 physics.ins-det

C. R. Haufe , A. L. Reine , N. Abgrall , S. I. Alvis , I. J. Arnquist , F. T. Avignone III , A. S. Barabash , C. J. Barton
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F. E. Bertrand T. Bode A. W. Bradley V. Brudanin M. Busch M. Buuck T. S. Caldwell Y.-D. Chan C. D. Christofferson P.-H. Chu C. Cuesta J. A. Detwiler C. Dunagan Yu. Efremenko H. Ejiri S. R. Elliott T. Gilliss G. K. Giovanetti M. P. Green J. Gruszko I. S. Guinn V. E. Guiseppe L. Hehn R. Henning E. W. Hoppe M. A. Howe K. J. Keeter M. F. Kidd S. I. Konovalov R. T. Kouzes A. M. Lopez R. D. Martin R. Massarczyk S. J. Meijer S. Mertens J. Myslik C. O'Shaughnessy G. Othman W. Pettus A. W. P. Poon D. C. Radford J. Rager K. Rielage R. G. H. Robertson N. W. Ruof B. Shanks M. Shirchenko A. M. Suriano D. Tedeschi J. E. Trimble R. L. Varner S. Vasilyev K. Vetter K. Vorren B. R. White J. F. Wilkerson C. Wiseman W. Xu E. Yakushev C.-H. Yu V. Yumatov I. Zhitnikov B. X. Zhu
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classification physics.ins-det
keywords cablesconnectorsdemonstratormajoranacontactcustomdetectorsexperiment
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The Majorana Demonstrator is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76Ge-enriched germanium p-type point contact detectors totaling 44.1 kg, located at the 4850 level of the Sanford Underground Research Facility in Lead, South Dakota, USA. The Demonstrator uses custom high voltage cables to bias the detectors, as well as custom signal cables and connectors to read out the charge deposited at the point contact of each detector. These low-mass cables and connectors must meet stringent radiopurity requirements while being subjected to thermal and mechanical stress. A number of issues have been identified with the currently installed cables and connectors. An improved set of cables and connectors for the Majorana Demonstrator are being developed with the aim of increasing their overall reliability and connectivity. We will discuss some of the issues encountered with the current cables and connectors as well as our improved designs and their initial performance.

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