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Title: Contamination control and assay results for the Majorana Demonstrator ultra clean components

Abstract

The Majorana Demonstrator is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The Demonstrator has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and process design.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. South Dakota School of Mines and Technology
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Laboratory, Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1481666
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Journal Volume: 1921; Conference: 6th International Workshop on Low Radioactivity Techniques (LRT) - Seoul, , South Korea - 5/23/2017 8:00:00 AM-5/27/2017 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Christofferson, C. D., Radford, David C., Varner Jr, Robert L., and Yu, Chang-Hong. Contamination control and assay results for the Majorana Demonstrator ultra clean components. United States: N. p., 2018. Web. doi:10.1063/1.5019001.
Christofferson, C. D., Radford, David C., Varner Jr, Robert L., & Yu, Chang-Hong. Contamination control and assay results for the Majorana Demonstrator ultra clean components. United States. doi:10.1063/1.5019001.
Christofferson, C. D., Radford, David C., Varner Jr, Robert L., and Yu, Chang-Hong. Mon . "Contamination control and assay results for the Majorana Demonstrator ultra clean components". United States. doi:10.1063/1.5019001. https://www.osti.gov/servlets/purl/1481666.
@article{osti_1481666,
title = {Contamination control and assay results for the Majorana Demonstrator ultra clean components},
author = {Christofferson, C. D. and Radford, David C. and Varner Jr, Robert L. and Yu, Chang-Hong},
abstractNote = {The Majorana Demonstrator is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The Demonstrator has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and process design.},
doi = {10.1063/1.5019001},
journal = {},
issn = {0094-243X},
number = ,
volume = 1921,
place = {United States},
year = {2018},
month = {1}
}

Conference:
Other availability
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Works referenced in this record:

The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment
journal, January 2014

  • Abgrall, N.; Aguayo, E.; Avignone, F. T.
  • Advances in High Energy Physics, Vol. 2014
  • DOI: 10.1155/2014/365432

The Majorana Demonstrator radioassay program
journal, August 2016

  • Abgrall, N.; Arnquist, I. J.; Avignone, F. T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 828
  • DOI: 10.1016/j.nima.2016.04.070

The Majorana Parts Tracking Database
journal, April 2015

  • Abgrall, N.; Aguayo, E.; Avignone, F. T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 779
  • DOI: 10.1016/j.nima.2015.01.001

Cleaning and passivation of copper surfaces to remove surface radioactivity and prevent oxide formation
journal, August 2007

  • Hoppe, E. W.; Seifert, A.; Aalseth, C. E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 579, Issue 1
  • DOI: 10.1016/j.nima.2007.04.101