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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. In conclusion, 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:
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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
Majorana Collaboration
OSTI Identifier:
1460306
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1921; Journal Issue: 1; Journal ID: ISSN 0094-243X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Christofferson, C. D., Abgrall, N., Alvis, S. I., Arnquist, I. J., Avignone, F. T., Barabash, A. S., Barton, C. J., Bertrand, F. E., Bode, T., Bradley, A. W., Brudanin, V., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y.-D., Chu, P.-H., Cuesta, C., Detwiler, J. A., Dunagan, C., Efremenko, Yu., Ejiri, H., Elliott, S. R., Gilliss, T., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Hehn, L., Henning, R., Hoppe, E. W., Howe, M. A., Keeter, K. J., Kidd, M. F., Konovalov, S. I., Kouzes, R. T., Lopez, A. M., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Myslik, J., O’Shaughnessy, C., Othman, G., Poon, A. W. P., Radford, D. C., Rager, J., Reine, A. L., Rielage, K., Robertson, R. G. H., Rouf, N. W., Shanks, B., Shirchenko, M., Suriano, A. M., Tedeschi, D., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yu, C.-H., Yumatov, V., Zhitnikov, I., and Zhu, B. X. Contamination control and assay results for the Majorana Demonstrator ultra clean components. United States: N. p., 2018. Web. doi:10.1063/1.5019001.
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Christofferson, C. D., Abgrall, N., Alvis, S. I., Arnquist, I. J., Avignone, F. T., Barabash, A. S., Barton, C. J., Bertrand, F. E., Bode, T., Bradley, A. W., Brudanin, V., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y.-D., Chu, P.-H., Cuesta, C., Detwiler, J. A., Dunagan, C., Efremenko, Yu., Ejiri, H., Elliott, S. R., Gilliss, T., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Hehn, L., Henning, R., Hoppe, E. W., Howe, M. A., Keeter, K. J., Kidd, M. F., Konovalov, S. I., Kouzes, R. T., Lopez, A. M., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Myslik, J., O’Shaughnessy, C., Othman, G., Poon, A. W. P., Radford, D. C., Rager, J., Reine, A. L., Rielage, K., Robertson, R. G. H., Rouf, N. W., Shanks, B., Shirchenko, M., Suriano, A. M., Tedeschi, D., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yu, C.-H., Yumatov, V., Zhitnikov, I., & Zhu, B. X. Contamination control and assay results for the Majorana Demonstrator ultra clean components. United States. https://doi.org/10.1063/1.5019001
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Christofferson, C. D., Abgrall, N., Alvis, S. I., Arnquist, I. J., Avignone, F. T., Barabash, A. S., Barton, C. J., Bertrand, F. E., Bode, T., Bradley, A. W., Brudanin, V., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y.-D., Chu, P.-H., Cuesta, C., Detwiler, J. A., Dunagan, C., Efremenko, Yu., Ejiri, H., Elliott, S. R., Gilliss, T., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Hehn, L., Henning, R., Hoppe, E. W., Howe, M. A., Keeter, K. J., Kidd, M. F., Konovalov, S. I., Kouzes, R. T., Lopez, A. M., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Myslik, J., O’Shaughnessy, C., Othman, G., Poon, A. W. P., Radford, D. C., Rager, J., Reine, A. L., Rielage, K., Robertson, R. G. H., Rouf, N. W., Shanks, B., Shirchenko, M., Suriano, A. M., Tedeschi, D., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yu, C.-H., Yumatov, V., Zhitnikov, I., and Zhu, B. X. Wed . "Contamination control and assay results for the Majorana Demonstrator ultra clean components". United States. https://doi.org/10.1063/1.5019001. https://www.osti.gov/servlets/purl/1460306.
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@article{osti_1460306,
title = {Contamination control and assay results for the Majorana Demonstrator ultra clean components},
author = {Christofferson, C. D. and Abgrall, N. and Alvis, S. I. and Arnquist, I. J. and Avignone, F. T. and Barabash, A. S. and Barton, C. J. and Bertrand, F. E. and Bode, T. and Bradley, A. W. and Brudanin, V. and Busch, M. and Buuck, M. and Caldwell, T. S. and Chan, Y.-D. and Chu, P.-H. and Cuesta, C. and Detwiler, J. A. and Dunagan, C. and Efremenko, Yu. and Ejiri, H. and Elliott, S. R. and Gilliss, T. and Giovanetti, G. K. and Green, M. P. and Gruszko, J. and Guinn, I. S. and Guiseppe, V. E. and Haufe, C. R. and Hehn, L. and Henning, R. and Hoppe, E. W. and Howe, M. A. and Keeter, K. J. and Kidd, M. F. and Konovalov, S. I. and Kouzes, R. T. and Lopez, A. M. and Martin, R. D. and Massarczyk, R. and Meijer, S. J. and Mertens, S. and Myslik, J. and O’Shaughnessy, C. and Othman, G. and Poon, A. W. P. and Radford, D. C. and Rager, J. and Reine, A. L. and Rielage, K. and Robertson, R. G. H. and Rouf, N. W. and Shanks, B. and Shirchenko, M. and Suriano, A. M. and Tedeschi, D. and Trimble, J. E. and Varner, R. L. and Vasilyev, S. and Vetter, K. and Vorren, K. and White, B. R. and Wilkerson, J. F. and Wiseman, C. and Xu, W. and Yakushev, E. and Yu, C.-H. and Yumatov, V. and Zhitnikov, I. and Zhu, B. X.},
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. In conclusion, 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 = {AIP Conference Proceedings},
number = 1,
volume = 1921,
place = {United States},
year = {2018},
month = {1}
}
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https://doi.org/10.1063/1.5019001
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Figures / Tables:

Table 1 Table 1: The summary of all the backgrounds contributing to the Demonstrator. The background contributions are organized by those due to natural radioactivity, cosmogenic activation, external & environmental, muon-induced, and neutrinos. The background values assume that the radioactive chains are in equilibrium. Adapted from Ref. [4]
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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
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