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Title: High voltage testing for the Majorana Demonstrator

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 76Ge. 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. Furthermore, a stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge.
Authors:
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  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of South Carolina, Columbia, SC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. National Research Center "Kurchatov Institute" Institute for Theoretical and Experimental Physics, Moscow (Russia)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Joint Institute for Nuclear Research, Dubna (Russia)
  7. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
  8. Univ. of Washington, Seattle, WA (United States)
  9. Univ. of South Dakota, Vermillion, SD (United States)
  10. South Dakota School of Mines and Technology, Rapid City, SD (United States)
  11. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  12. Univ. of Tennessee, Knoxville, TN (United States)
  13. Osaka Univ., Osaka (Japan)
  14. Triangle Univ. Nuclear Lab., Durham, NC (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
  15. Univ. of South Carolina, Columbia, SC (United States)
  16. Black Hills State Univ., Spearfish, SD (United States)
  17. Tennessee Technological Univ., Cookeville, TN (United States)
  18. Queen's Univ., Kingston, ON (Canada)
  19. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  20. Triangle Univ. Nuclear Lab., Durham, NC (United States); Univ. of North Carolina, Chapel Hill, NC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
OSTI Identifier:
1296686
Report Number(s):
LA-UR--16-22388
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 823; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY atomic and nuclear physics; high-voltage; micro-discharge; vacuum; Majorana