High voltage testing for the MAJORANA Demonstrator
N. Abgrall, I.J. Arnquist, F.T. Avignone III, A.S. Barabash, F.E., Bertrand, A.W. Bradley, V. Brudanin, M. Busch, M. Buuck, D. Byram, A.S., Caldwell, Y-D. Chan, C.D. Christofferson, P.-H. Chu, C. Cuesta, J.A., Detwiler, P.J. Doe, C. Dunagan, Yu. Efremenko, H. Ejiri, S.R. Elliott

TL;DR
This paper investigates high-voltage testing and micro-discharge effects in the MAJORANA Demonstrator's detector system, ensuring reliable operation at voltages up to 5 kV through optimized cable and feedthrough design.
Contribution
It presents a comprehensive study of high-voltage micro-discharge phenomena and develops optimized configurations for cables and feedthroughs in the MAJORANA detector system.
Findings
Micro-discharge effects can be mitigated with proper design.
Optimized cable and feedthrough configurations enable stable high-voltage operation.
All components tested meet the required voltage specifications.
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…
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