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Title: The Majorana Demonstrator calibration system

The Majorana Collaboration is searching for the neutrinoless double-beta decay of the nucleus 76Ge. The Majorana Demonstrator is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a 1-ton 76Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioactive line sources can be deployed around the cryostats containing the detectors for regular energy calibrations. When measuring in low-background mode, these line sources have to be stored outside the shielding so they do not contribute to the background. The deployment and the retraction of the source are designed to be controlled by the data acquisition system and do not require any direct human interaction. In this study, we detail the design requirements and implementation of the calibration apparatus, which provides the event rates needed to define the pulse-shape cuts and energy calibration used in the final analysis as well as data that can be compared to simulations.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [6] ;  [9] ;  [9] ;  [11] ;  [12] ;  [13] ;  [6] ;  [9] more »;  [6] ;  [10] ;  [14] ;  [6] ;  [15] ;  [9] ;  [9] ;  [16] ;  [10] ;  [10] ;  [2] ;  [10] ;  [17] ;  [18] ;  [19] ;  [4] ;  [2] ;  [12] ;  [10] ;  [20] ;  [6] ;  [10] ;  [1] ;  [2] ;  [10] ;  [1] ;  [5] ;  [10] ;  [10] ;  [6] ;  [9] ;  [10] ;  [7] ;  [11] ;  [16] ;  [10] ;  [5] ;  [7] ;  [21] ;  [10] ;  [6] ;  [22] ;  [16] ;  [17] ;  [5] ;  [4] ;  [7] ;  [6] « less
  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. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Joint Institute for Nuclear Research, Dubna (Russia)
  8. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
  9. Univ. of Washington, Seattle, WA (United States)
  10. Univ. of North Carolina, Chapel Hill, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
  11. South Dakota School of Mines and Technology, Rapid City, SD (United States)
  12. Univ. of Tennessee, Knoxville, TN (United States)
  13. Osaka Univ., Osaka (Japan)
  14. Princeton Univ., Princeton, NJ (United States)
  15. North Carolina State Univ., Raleigh, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  16. Univ. of South Carolina, Columbia, SC (United States)
  17. Univ. of South Dakota, Vermillion, SD (United States)
  18. Black Hills State Univ., Spearfish, SD (United States)
  19. Tennessee Technological Univ., Cookeville, TN (United States)
  20. Queen's Univ., Kingston, ON (Canada)
  21. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  22. Univ. of North Carolina, Chapel Hill, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Report Number(s):
LA-UR-17-20458
Journal ID: ISSN 0168-9002; TRN: US1702560
Grant/Contract Number:
AC52-06NA25396; AC02-05CH11231
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: 872; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program; 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; Majorana Demonstrator, Calibration, Double-beta decay, detector performance
OSTI Identifier:
1375174
Alternate Identifier(s):
OSTI ID: 1460300