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Title: Design, construction, and characterization of a compact DD neutron generator designed for 40Ar/39Ar geochronology

A next-generation, high-flux DD neutron generator has been designed, commissioned, and characterized, and is now operational in a new facility at the University of California Berkeley. The generator, originally designed for 40Ar/ 39Ar dating of geological materials, has since served numerous additional applications, including medical isotope production studies, with others planned for the near future. In this work, we present an overview of the High Flux Neutron Generator (HFNG) which includes a variety of simulations, analytical models, and experimental validation of results. Extensive analysis was performed in order to characterize the neutron yield, flux, and energy distribution at specific locations where samples may be loaded for irradiation. A notable design feature of the HFNG is the possibility for sample irradiation internal to the cathode, just 8 mm away from the neutron production site, thus maximizing the neutron flux (n/cm 2/s). The generator’s maximum neutron flux at this irradiation position is 2.58 x 10 7 n/cm 2/s ± 5% (approximately 3 x 10 8 n/s total yield) as measured via activation of small natural indium foils. However, future development is aimed at achieving an order of magnitude increase in flux. Additionally, the deuterium ion beam optics were optimized by simulations formore » various extraction configurations in order to achieve a uniform neutron flux distribution and an acceptable heat load. Finally, experiments were performed in order to benchmark the modeling and characterization of the HFNG.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [2] ;  [6] ;  [2] ;  [2] ;  [2] ;  [4] ;  [7] ;  [4] ;  [1] ;  [2] ;  [3]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Berkeley Geochronology Center, Berkeley, CA (United States)
  5. Univ. of Tennessee, Knoxville, TN (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  7. Univ. of Massachusetts, Lowell, MA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-748524
Journal ID: ISSN 0168-9002; 932766
Grant/Contract Number:
AC52-07NA27344
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: 903; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1481079

Ayllon, Mauricio, Adams, Parker A., Batchelder, Jon C., Bauer, Joseph D., Becker, Tim A., Bernstein, Lee A., Chong, Su-Ann, James, Jay, Kirsch, Leo E., Leung, Ka-Ngo, Matthews, Eric F., Morrell, Jonathan T., Renne, Paul R., Rogers, Andrew M., Rutte, Daniel, Voyles, Andrew S., Van Bibber, Karl, and Waltz, Cory S.. Design, construction, and characterization of a compact DD neutron generator designed for 40Ar/39Ar geochronology. United States: N. p., Web. doi:10.1016/j.nima.2018.04.020.
Ayllon, Mauricio, Adams, Parker A., Batchelder, Jon C., Bauer, Joseph D., Becker, Tim A., Bernstein, Lee A., Chong, Su-Ann, James, Jay, Kirsch, Leo E., Leung, Ka-Ngo, Matthews, Eric F., Morrell, Jonathan T., Renne, Paul R., Rogers, Andrew M., Rutte, Daniel, Voyles, Andrew S., Van Bibber, Karl, & Waltz, Cory S.. Design, construction, and characterization of a compact DD neutron generator designed for 40Ar/39Ar geochronology. United States. doi:10.1016/j.nima.2018.04.020.
Ayllon, Mauricio, Adams, Parker A., Batchelder, Jon C., Bauer, Joseph D., Becker, Tim A., Bernstein, Lee A., Chong, Su-Ann, James, Jay, Kirsch, Leo E., Leung, Ka-Ngo, Matthews, Eric F., Morrell, Jonathan T., Renne, Paul R., Rogers, Andrew M., Rutte, Daniel, Voyles, Andrew S., Van Bibber, Karl, and Waltz, Cory S.. 2018. "Design, construction, and characterization of a compact DD neutron generator designed for 40Ar/39Ar geochronology". United States. doi:10.1016/j.nima.2018.04.020.
@article{osti_1481079,
title = {Design, construction, and characterization of a compact DD neutron generator designed for 40Ar/39Ar geochronology},
author = {Ayllon, Mauricio and Adams, Parker A. and Batchelder, Jon C. and Bauer, Joseph D. and Becker, Tim A. and Bernstein, Lee A. and Chong, Su-Ann and James, Jay and Kirsch, Leo E. and Leung, Ka-Ngo and Matthews, Eric F. and Morrell, Jonathan T. and Renne, Paul R. and Rogers, Andrew M. and Rutte, Daniel and Voyles, Andrew S. and Van Bibber, Karl and Waltz, Cory S.},
abstractNote = {A next-generation, high-flux DD neutron generator has been designed, commissioned, and characterized, and is now operational in a new facility at the University of California Berkeley. The generator, originally designed for 40Ar/39Ar dating of geological materials, has since served numerous additional applications, including medical isotope production studies, with others planned for the near future. In this work, we present an overview of the High Flux Neutron Generator (HFNG) which includes a variety of simulations, analytical models, and experimental validation of results. Extensive analysis was performed in order to characterize the neutron yield, flux, and energy distribution at specific locations where samples may be loaded for irradiation. A notable design feature of the HFNG is the possibility for sample irradiation internal to the cathode, just 8 mm away from the neutron production site, thus maximizing the neutron flux (n/cm2/s). The generator’s maximum neutron flux at this irradiation position is 2.58 x 107 n/cm2/s ± 5% (approximately 3 x 108 n/s total yield) as measured via activation of small natural indium foils. However, future development is aimed at achieving an order of magnitude increase in flux. Additionally, the deuterium ion beam optics were optimized by simulations for various extraction configurations in order to achieve a uniform neutron flux distribution and an acceptable heat load. Finally, experiments were performed in order to benchmark the modeling and characterization of the HFNG.},
doi = {10.1016/j.nima.2018.04.020},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 903,
place = {United States},
year = {2018},
month = {5}
}