Dr. Ryan M. Bergmann

Senior Software Engineer, Thought Machine

WARP | GitHub | LinkedIn | ORCID | Google Scholar | Public PGP Key

Publications

• M. Magán, R. M. Bergmann , "Supermirror physics with event biasing in MCNP6", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 6 Dec 2019, preprint, doi:10.1016/j.nima.2019.163168

• D. Aulet, Y. Dai, R.M. Bergmann, M. Wohlmuther, "Radiation damage assessment of the sixth SINQ target irradiation program based on MCNPX simulation," Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 922, 2019, Pages 310-321, doi:10.1016/j.nima.2018.12.013

• Ryan M. Bergmann, Masako Yamada, Uwe Filges, Michael Wohlmuther, Tibor Reiss, Vadim Talanov, "Neutron brilliance of the liquid deuterium cold source as measured from the ICON beamline at the swiss spallation neutron source (SINQ)," Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 906, 21 October 2018, Pages 61-67, doi:10.1016/j.nima.2018.07.007

• C. Klauser, R. Bergmann, U. Filges, J. Stahn, "A Selene Guide for AMOR," International Collaboration on Advanced Neutron Sources (ICANS) XXII, Journal of Physics: Conference Series, 2018, http://stacks.iop.org/1742-6596/1021/i=1/a=012024

• Ryan M. Bergmann, Kelly L. Rowland, Nikola Radnović, Rachel N. Slaybaugh, Jasmina L. Vujić, "Performance and accuracy of criticality calculations performed using WARP – A framework for continuous energy Monte Carlo neutron transport in general 3D geometries on GPUs, Annals of Nuclear Energy," Volume 103, May 2017, Pages 334-349, ISSN 0306-4549, doi:10.1016/j.anucene.2017.01.027

• Felix Groitl, Marek Bartkowiak, Ryan M. Bergmann, Jonas Okkels Birk, Marton Marko, Alex Bollhalder, Dieter Graf, Christof Niedermayer, Christian Rueegg, Henrik M. Rønnowa, "Evaluation of HOPG mounting possibilities for multiplexing spectrometers," Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 858, 21 June 2017, Pages 30-35, doi:10.1016/j.nima.2017.03.031

• R. M. Bergmann, U. Filges, D. Kiselev, T. Reiss, V. Talanov, M. Wohlmuther, "Upgrades to the SINQ Cold Neutron Source,"  European Conference on Neutron Scattering (ECNS) Proceedings, September 2015, doi:10.1088/1742-6596/746/1/012035.

• K. L. Rowland, R. N. Slaybaugh, R. M. Bergmann, and J. Vujic, "Implementing delta-tracking in a GPU-accelerated Monte Carlo neutron transport," Proceedings of Frontiers in Computational Physics: Energy Sciences in Zurich, Switzerland, June 2015.

• R. M. Bergmann, U. Filges, S. Forss, E. Rantsiou, D. Reggiani, T. Reiss, U. Stuhr, V. Talanov, M. Wohlmuther, "Verification of the Neutron Mirror Capabilities in MCNPX via Gold Foil Measurements at the EIGER Instrument Beamline at the Swiss Spallation Neutron Source (SINQ),"  6th International Particle Accelerator Conference (IPAC) Proceedings, May 2015, Pre-press Proceedings.

• R. M. Bergmann, J. L. Vujic, "Algorithmic Choices in WARP - A Framework for Continuous Energy Monte Carlo Neutron Transport in General 3D Geometries on GPUs,"   Annals of Nuclear Engineering, Volume 77, March 2015, Pages 176–193, doi:10.1016/j.anucene.2014.10.039

• R. M. Bergmann, J. L. Vujic, "The Effects of Reference Remapping in WARP, a GPU-Accelerated, Continuous Energy Monte Carlo Neutron Transport Framework,"  ANS Winter Meeting Transactions, November 2014.

• R. M. Bergmann, J. L. Vujic, "Monte Carlo Neutron Transport on GPUs,"  22nd International Conference on Nuclear Engineering (ICONE22) Meeting Transactions, July 2014, doi:10.1115/icone22-30148.

• R. M. Bergmann, J. L. Vujic, E. Greenspan, P. F. Peterson, R. N. Slaybaugh, P.-O. Persson, "The Development of WARP - A Framework for Continuous Energy Monte Carlo Neutron Transport in General 3D Geometries on GPUs,"  Ph.D. Dissertation, Nuclear Engineering, University of California - Berkeley, Berkeley, CA, May 2014.

• R. M. Bergmann, J. L. Vujic, "Optimization of Monte Carlo Algorithms and Ray Tracing on GPUs,"  Supercomputing in Nuclear Applications and Monte Carlo (SNA+MC) Meeting Transactions, October 2013, doi:10.1051/snamc/201404212.

• R. M. Bergmann, J. L. Vujic, "GPU Ray Tracing for Monte Carlo Neutron Transport using NVIDIA OptiX,"  ANS Student Meeting Transactions, April 2013.

• R. M. Bergmann, J. L. Vujic, N. A. Fischer, "2D Mono-Energetic Particle Transport on a GPU,"  ANS Winter Meeting Transactions, November 2012.

• T. Downar, A. Hall, D. Jabaay, A. Ward, E. Greenspan, F. Ganda, F. Bartoloni, R. Bergmann, C. Varela, C. DiSanzo, M. Kazimi, A. Karahan, E. Shwageraus, B. Feng, B. Herman, "Technical Evaluation of the Hitachi Resource-Renewable BWR (RBWR) Design Concept," EPRI Technical Report 1025086, April 2012.

• J. Vujic, R. M. Bergmann, R. Skoda, M. Miletic, "Small modular reactors: Simpler, safer, cheaper?" Energy (2012), doi:10.1016/j.energy.2012.01.078

• A. C. Boxer, R. Bergmann, J. L. Ellsworth, D. T. Garnier, J. Kesner, M. E. Mauel & P. Woskov, "Turbulent inward pinch of plasma confined by a levitated dipole magnet," Nature Physics, 24 January 2010, doi:10.1038/nphys1510

• R. M. Bergmann, D. T. Garnier, J. Kesner, "Characterization of low-frequency electric potential oscillations near the edge of a plasma confined by a levitated magnetic dipole," M.S./B.S. Thesis, Nuclear Engineering, MIT, Cambridge, MA, 2009.