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1. A gateway towards non-collinear spin processing using three-atom magnets with strong substrate coupling

Author

J. Hermenau, J. Ibañez-Azpiroz, Chr. Hübner, A. Sonntag, B. Baxevanis, K. T. Ton, M. Steinbrecher, A. A. Khajetoorians, M. dos Santos Dias, S. Blügel, R. Wiesendanger, S. Lounis, and J. Wiebe

Subjects
Science
Abstract

Information technology based on few atom magnets requires both long spin-energy relaxation times and flexible inter-bit coupling. Here, the authors show routes to manipulate information in three-atom clusters strongly coupled to substrate electrons by exploiting Dzyaloshinskii–Moriya interactions.

Published
2017
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2. High voltage testing for the Majorana Demonstrator

Author

Ralph Massarczyk, A. Galindo-Uribarri, Yuen-Dat Chan, S. Vasilyev, A. Li, A. Thompson, Alan Poon, N. Abgrall, Anne-Marie Suriano, J. A. Detwiler, Z. Fu, F. E. Bertrand, R. D. Martin, J. Gruszko, J. Goett, J. F. Wilkerson, R. G. H. Robertson, M. A. Howe, E. Romero-Romero, D. J. Tedeschi, B. R. White, C.M. O'Shaughnessy, Stanley M. Howard, Jonathan D. Leon, I. S. Guinn, F. T. Avignone, R. L. Varner, B. R. Jasinski, M. P. Green, M. Buuck, C. Wiseman, Reyco Henning, Eric W. Hoppe, C. Cuesta, J. Rager, D. Byram, Matthew Busch, Y.-U. Efremenko, P. J. Doe, C.-H. Yu, H. Ejiri, A. S. Barabash, Susanne Mertens, A. W. Bradley, V. Yumatov, K. J. Keeter, V.B. Brudanin, B. Shanks, V. E. Guiseppe, S. R. Elliott, Brian D. LaFerriere, D. C. Radford, A. S. Caldwell, Keith Rielage, M. Shirchenko, John L. Orrell, J. MacMullin, Kai Vetter, S. J. Meijer, C. D. Christofferson, K. Vorren, K. T. Ton, M. F. Kidd, E. Yakushev, C. Dunagan, S. I. Konovalov, W. Xu, G. K. Giovanetti, J. E. Trimble, Pinghan Chu, Richard T. Kouzes, I. J. Arnquist, and N. Snyder

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Vacuum, FOS: Physical sciences, Feedthrough, Context (language use), nucl-ex, Atomic, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation, Physics, MAJORANA, hep-ex, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, Molecular, High voltage, Instrumentation and Detectors (physics.ins-det), High-voltage, Micro-discharge, Modular design, Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, business, Astronomical and Space Sciences, Voltage
Abstract

The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge., 9 pages, 12 figures, 8 tables, submitted to NIM A

Published
2016
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