Celeritas is a new Monte Carlo transport code designed to accelerate scientific discovery in high energy physics by improving detector simulation throughput and energy efficiency using GPUs.

For users

• Download the latest release
• Read the documentation
• Track integration with HEP/NP experiments

See more details on the code README or the documentation linked above.

For contributors

• Find an interesting potential project
• Before writing new code, read the development guide
• Explore the codebase with detailed Doxygen code documentation

Publications

These publications are extracted from the Celeritas team’s Zotero database.

Conference papers

• S. R. Johnson, J. Esseiva, E. Biondo, P. Canal, M. Demarteau, et al. “Celeritas: Accelerating Geant4 with GPUs”. EPJ Web of Conferences, Oct 2024. 10.1051/epjconf/202429511005
• S. C. Tognini, P. Canal, T. M. Evans, G. Lima, A. L. Lund, et al. “Celeritas: GPU-accelerated particle transport for detector simulation in High Energy Physics experiments”. in Snowmass white papers, Mar 2022. 10.48550/arXiv.2203.09467
• S. R. Johnson, S. C. Tognini, P. Canal, T. Evans, S. Y. Jun, et al. “Novel features and GPU performance analysis for EM particle transport in the Celeritas code”. EPJ Web of Conferences, Oct 2021. 10.1051/epjconf/202125103030

Presentations

• S. R. Johnson. “Celeritas: scientific software for HEP simulation”. HSF-India, 01 Aug 2024. presentation
• S. R. Johnson. “Scalable simulation workflows for Celeritas”. SciDAC PI Meeting, 17 Jul 2024.
• S. R. Johnson, S. Tognini, T. Evans, et al. “Celeritas: the next generation of HEP simulation”. SciDAC PI Meeting, 16 Jul 2024.
• S. Tognini. “Muon-catalyzed fusion beamline optimization using Celeritas”. SciDAC PI Meeting, 16 Jul 2024.
• A. Lund. “Celeritas: Accelerating HEP Detector Simulation on GPUs”. PASC ‘24, 03 Jun 2024.
• E. Biondo, S. Johnson. “GPU-Based Monte Carlo Particle Transport Simulations for Nuclear Energy and High-Energy Physics Applications”. On the Trail to Exascale and Scalable AI Workshop, 20 May 2024.
• J. Esseiva. “Celeritas: Evaluating Performance of HEP Detector Simulation on GPUs”. ACAT 2024, 14 Mar 2024. poster
• S. R. Johnson. “Celeritas for platform portable HEP comparison”. 06 Mar 2024. presentation
• J. Esseiva. “Celeritas: Efficient detector simulation on GPUs for Geant4”. LBNL ATLAS annual meeting, 08 Jan 2024.
• S. R. Johnson. “Celeritas R&D Summary”. Geant4 R&D Assessment, 13 Dec 2023.
• S. R. Johnson. “Celeritas: efficient detector simulation on GPUs for Geant4”. Compute Accelerator Forum, 11 Dec 2023. presentation
• S. R. Johnson. “Full-featured Geant4 GPU acceleration using Celeritas”. SWIFT-HEP #6, 21 Nov 2023. presentation
• S. R. Johnson. “Celeritas v0.4: we’re ready!”. CMS Simulation Group Meeting, 10 Nov 2023. presentation
• S. R. Johnson. “Celeritas: computational challenges and possible FASTMath solutions”. FASTMath All Hands, 02 Nov 2023.
• S. R. Johnson. “High Energy Physics Monte Carlo on GPU: Celeritas”. Monte Carlo Computational Summit, 25 Oct 2023.
• S. R. Johnson. “Celeritas v0.3: EM offloading for Geant4”. 28th Geant4 Collaboration Meeting, 28 Sep 2023. presentation
• S. R. Johnson, E. Biondo, T. Evans, et al. “ORANGE surface geometry progress”. 28th Geant4 Collaboration Meeting, 26 Sep 2023. presentation
• G. Lima. “In-memory Geometry Converter”. 28th Geant4 Collaboration Meeting, 26 Sep 2023. presentation
• A. Lund. “Celeritas: HEP detector simulation on GPUs”. SciDAC-5 PI Meeting, 13 Sep 2023.
• S. Tognini. “Celeritas: Focused talk: initial results”. SciDAC-5 PI Meeting, 13 Sep 2023.
• T. Evans. “Celeritas: overview”. SciDAC-5 PI Meeting, 13 Sep 2023.
• S. R. Johnson. “Celeritas: EM physics on GPUs”. CalVision general meeting, 08 Jun 2023. presentation
• S. R. Johnson. “Celeritas: EM physics on GPUs
 and a path to full-featured accelerated detector simulation”. CHEP 2023, 08 May 2023. presentation
• S. Tognini. “Celeritas: A GPU Monte Carlo Detector simulation code for HEP”. Amherst Center for Fundamental Interactions Seminar, 11 Apr 2023.
• S. Tognini. “Celeritas: Using GPUs to accelerate HEP detector simulation”. APS, 03 Apr 2023. presentation
• B. Morgan. “Update on AdePT/Celeritas”. SWIFT-HEP Collaboration Meeting, 30 Mar 2023. presentation
• S. R. Johnson. “Unbounded surface models and ORANGE”. SWIFT-HEP Collaboration Meeting, 30 Mar 2023. presentation
• S. R. Johnson. “Celeritas v0.2: Geant4 Integration for CMS”. CMS Phase 2 SW Meeting, 10 Mar 2023. presentation
• S. R. Johnson. “First steps toward ATLAS/Celeritas integration”. ATLAS Simulation Meeting, 01 Mar 2023. presentation
• J. Esseiva. “Accelerating full detector simulation with Celeritas”. Annual LBNL ATLAS Meeting, 24 Feb 2023.
• S. R. Johnson. “Celeritas ATLAS close-out”. Celeritas/ATLAS Hackathon, 24 Feb 2023. presentation
• S. R. Johnson. “Celeritas v0.2: Offloading EM tracks to GPU from Geant4”. RPM Seminar, 21 Feb 2023. presentation
• S. R. Johnson. “Celeritas v0.2: CMS update”. CMS Simulation Meeting, 17 Feb 2023. presentation
• W. Pokorski. “Update on R&D activities”. Geant4 Technical Forum R&D update, 02 Feb 2023. presentation
• S. R. Johnson. “Celeritas: Monte Carlo detector simulation on GPU”. IRIS-HEP HL-LHC Computing R&D Workshop, 07 Nov 2022. presentation
• S. R. Johnson. “ORANGE: surface-based GPU geometry”. 27th Geant4 Collaboration Meeting, 29 Sep 2022. presentation
• S. R. Johnson. “Celeritas: Version 0.1”. 27th Geant4 Collaboration Meeting, 26 Sep 2022. presentation
• S. R. Johnson. “Celeritas Version 0.1: CMS update”. CMS Simulation Meeting, 23 Sep 2022. presentation
• A. Lund. “Celeritas: GPU-accelerated particle transport for detector simulation in HEP experiments”. CPS Seminar, 02 Sep 2022. presentation
• S. Tognini. “Celeritas: HEP detector simulation on GPUs [Snowmass]”. Snowmass, 18 Jul 2022. poster
• S. R. Johnson. “Celeritas: GPU detector simulation”. Compute Accelerator Forum, 29 Jun 2022. presentation
• T. Evans. “Exascale Computing at ORNL Past, Current, and Future: Opportunities for High Energy Physics”. CERN Computing Seminar, 29 Jun 2022. presentation
• S. R. Johnson. “Celeritas: conclusion and challenges”. HSF Detector Simulation on GPU Community Meeting, 06 May 2022. presentation
• S. Y. Jun. “Celeritas integration ideas: Acceleritas”. HSF Detector Simulation on GPU Community Meeting, 06 May 2022. presentation
• S. Tognini. “Experiment integration”. HSF Detector Simulation on GPU Community Meeting, 06 May 2022. presentation
• S. R. Johnson. “Celeritas physics interface”. HSF Detector Simulation on GPU Community Meeting, 05 May 2022. presentation
• S. Tognini. “Celeritas physics validation”. HSF Detector Simulation on GPU Community Meeting, 05 May 2022. presentation
• S. Y. Jun. “Celeritas Physics Perspectives”. HSF Detector Simulation on GPU Community Meeting, 05 May 2022. presentation
• S. R. Johnson. “Celeritas: ORANGE”. HSF Detector Simulation on GPU Community Meeting, 04 May 2022. presentation
• S. Y. Jun. “Celeritas Magnetic Field”. HSF Detector Simulation on GPU Community Meeting, 04 May 2022. presentation
• G. Lima. “Celeritas geometry – VecGeom”. HSF Detector Simulation on GPU Community Meeting, 04 May 2022. presentation
• S. R. Johnson. “Celeritas project and code overview”. HSF Detector Simulation on GPU Community Meeting, 03 May 2022. presentation
• A. Lund. “Celeritas performance”. HSF Detector Simulation on GPU Community Meeting, 03 May 2022. presentation
• T. Evans. “HEP-CCE: Celeritas”. HEP-CCE All Hands Meeting, 21 Apr 2022. presentation
• W. Pokorski. “2022 Work-plan for R&D”. Geant4 Technical Forum R&D update, 24 Mar 2022. presentation
• S. Tognini. “Celeritas: Bringing Exascale computing to HEP detector simulation”. Physics and Astronomy Colloquium, 22 Mar 2022.
• S. R. Johnson. “HEP HPC at LHC, MC on GPU, WTF BBQ LOL?”. UTK HEP-Astro Seminar, 02 Mar 2022.
• S. R. Johnson. “Novel features and GPU performance analysis for EM particle transport in the Celeritas code [presentation]”. vCHEP 2021, 19 May 2021. presentation
• S. R. Johnson. “Celeritas: Status and Plans”. HSF Detector Simulation Working Group Meeting, 12 Apr 2021. presentation
• W. Pokorski. “Geant4 R&D: activities for 2021”. Geant4 Technical Forum R&D update, 11 Mar 2021. presentation
• T. Evans. “Celeritas: toward GPU-based particle transport for detector simulations
 in HEP experiments”. HSF-WLCG Workshop, 23 Nov 2020.
• T. Evans. “Monte Carlo neutron transport in the ECP Coupled Monte Carlo Neutronics and Fluid Flow Simulation of Small Modular Reactor (ExaSMR) project”. Geant4 R&D Task Force Meeting, 14 Apr 2020.
• T. Evans. “Celeritas: toward GPU-based particle transport for detector simulations in HEP experiments”. Geant4 R&D Task Force Meeting, 14 Apr 2020.

Journal articles

• P. K. Romano, P. A. Myers, S. R. Johnson, A. Kols̆ek, P. C. Shriwise, et al. “Point containment algorithms for constructive solid geometry with unbounded primitives”. Computer-Aided Design, Jan 2025. 10.1016/j.cad.2024.103803
• E. Biondo, T. Evans, S. Johnson, S. Hamilton. “Comparison of Nested Geometry Treatments within GPU-Based Monte Carlo Neutron Transport Simulations of Fission Reactors”. Jun 2024. arxiv.org
• J. Apostolakis, M. Bandieramonte, S. Banerjee, N. Bartosik, G. Corti, et al. “Detector Simulation Challenges for Future Accelerator Experiments”. Frontiers in Physics, Jun 2022. 10.3389/fphy.2022.913510

Technical reports

• S. R. Johnson, S. Castro Tognini, E. Biondo, T. Evans, J. Esseiva, et al. “Celeritas R&D Report: Accelerating Geant4”. Jan 2024. www.osti.gov

Code

• S. R. Johnson, A. Lund, S. Y. Jun, S. Tognini, G. Lima, P. Canal, B. Morgan, T. Evans, J. Esseiva. “Celeritas v1040”. Jul 2022.

References

A full list of references includes details about physics models and links to publications about related software.

License

Celeritas documentation falls under the license below. The code license may be different.

Intellectual Property Notice

Celeritas documentation is licensed under the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/legalcode).

Copyrights and patents in the Celeritas project are retained by contributors. No copyright assignment is required to contribute to Celeritas.

SPDX usage

Individual files contain SPDX tags instead of the full license text. This enables machine processing of license information based on the SPDX License Identifiers that are available here: https://spdx.org/licenses/

Files that are licensed under CC 4.0 with attribution contain the following text in the license header:

SPDX-License-Identifier: CC-BY-4.0