atcollab/at
Dec 2024 – May 2026
10 Months active
Languages Used
MATLABPythonCC++
Technical Skills
Code RefactoringLibrary DevelopmentNumerical AnalysisPhysicsAccelerator PhysicsC Programming
Simon White
PROFILE
Simon White
Over ten months, contributed to the atcollab/at repository by developing advanced simulation features and stabilizing core accelerator physics workflows. Delivered modules for resonance analysis, GPU-accelerated aperture checks, and radiation-aware transfer matrices, while enhancing data serialization and NumPy compatibility. Applied C, Python, and MATLAB to implement robust numerical methods, improve code documentation, and ensure cross-language interoperability. Addressed critical bugs in orbit and radiation calculations, introduced validation logic for energy parameters, and modernized transformation systems with improved error handling. The work emphasized maintainability, backward compatibility, and reliability, supporting accurate modeling and streamlined onboarding for scientific computing and accelerator simulation projects.
Overall Statistics
Feature vs Bugs
62%Features
Repository Contributions
13Total
Bugs
5
Commits
13
Features
8
Lines of code
3,249
Activity Months10
Your Network
32 peopleSame Organization
@esrf.fr25
Jerome KiefferMember
Alejandro Homs PuronMember
Antonia BetevaMember
Marjolaine BodinMember
Alejandro De Maria AntolinosMember
Edgar Gutierrez FernandezMember
paynoMember
Jerome KiefferMember
Laurent FarvacqueMember
Work History
May 2026
1 Commits • 1 Features
May 1, 2026May 2026 monthly summary focused on expanding simulation fidelity for radiation-aware lattice calculations while preserving backward compatibility. Delivered a new 6x6 transfer matrix pass method (Matrix66RadPass) that enables radiation effects in matrix calculations, with careful handling of optional parameters and compatibility with existing lattices. Updated Matlab M66 creation workflow and aligned default settings (Fortran alignment) to reduce configuration friction. Resulting improvements support more accurate accelerator studies and smoother adoption for users upgrading from legacy lattices. Collaboration with ESRF helped validate lattice compatibility and radiation handling.
1 Commits • 1 Features
May 1, 2026May 2026 monthly summary focused on expanding simulation fidelity for radiation-aware lattice calculations while preserving backward compatibility. Delivered a new 6x6 transfer matrix pass method (Matrix66RadPass) that enables radiation effects in matrix calculations, with careful handling of optional parameters and compatibility with existing lattices. Updated Matlab M66 creation workflow and aligned default settings (Fortran alignment) to reduce configuration friction. Resulting improvements support more accurate accelerator studies and smoother adoption for users upgrading from legacy lattices. Collaboration with ESRF helped validate lattice compatibility and radiation handling.
May 2026
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for atcollab/at. Focused on delivering key physics capabilities and stabilizing simulations to improve reliability and business value. Delivered a new emittance calculation utility (eigen and projected emittances) to enhance beam diagnostics and tracking. Implemented a positivity validation to forbid negative lattice or element energies, reducing calculation errors and improving robustness. Overall impact includes higher simulation reliability, easier benchmarking, and better data quality for decision-making. Technologies demonstrated include Python development, numerical emittance algorithms, validation logic, clean code practices, and considerations for MATLAB interoperability.
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for atcollab/at. Focused on delivering key physics capabilities and stabilizing simulations to improve reliability and business value. Delivered a new emittance calculation utility (eigen and projected emittances) to enhance beam diagnostics and tracking. Implemented a positivity validation to forbid negative lattice or element energies, reducing calculation errors and improving robustness. Overall impact includes higher simulation reliability, easier benchmarking, and better data quality for decision-making. Technologies demonstrated include Python development, numerical emittance algorithms, validation logic, clean code practices, and considerations for MATLAB interoperability.
February 2026
1 Commits
Feb 1, 2026February 2026 monthly summary for atcollab/at. This period focused on code hygiene and reliability in grid boundary search by removing an unnecessary verbose keyword argument from the tracking function call, reducing potential argument handling issues and improving API call cleanliness. Implemented via commit 6b99834a9a4463310d88b6fcdc147a9cdd9ff404. No new features were delivered this month; the work delivered was a targeted bug fix and cleanup that enhances stability and maintainability of grid boundary search.
1 Commits
Feb 1, 2026February 2026 monthly summary for atcollab/at. This period focused on code hygiene and reliability in grid boundary search by removing an unnecessary verbose keyword argument from the tracking function call, reducing potential argument handling issues and improving API call cleanliness. Implemented via commit 6b99834a9a4463310d88b6fcdc147a9cdd9ff404. No new features were delivered this month; the work delivered was a targeted bug fix and cleanup that enhances stability and maintainability of grid boundary search.
February 2026
January 2026
1 Commits • 1 Features
Jan 1, 2026Month 2026-01: Delivered the Element Transformation System Enhancement in atcollab/at, introducing transformation attributes, reference-frame rotation support, and robust error handling for reference-point changes. This work modernized the transformation pipeline, improved lattice manipulation accuracy, and reduced runtime errors. Also completed code refactoring, expanded documentation, and enhanced file save/load to persist new attributes.
January 2026
1 Commits • 1 Features
Jan 1, 2026Month 2026-01: Delivered the Element Transformation System Enhancement in atcollab/at, introducing transformation attributes, reference-frame rotation support, and robust error handling for reference-point changes. This work modernized the transformation pipeline, improved lattice manipulation accuracy, and reduced runtime errors. Also completed code refactoring, expanded documentation, and enhanced file save/load to persist new attributes.
November 2025
1 Commits
Nov 1, 2025November 2025 (atcollab/at) – Delivered a critical bug fix in the radiation module that corrects Ohmi envelope calculations by changing the PassMethod from StrMPoleSymplectic4RadPass to BndMPoleSymplectic4RadPass. This fix improves accuracy of radiation-related physics calculations, stability of simulations, and trust in downstream analyses. The change is captured in commit af8528db15f00a4028b3059c02c163a8734e04d4 with message 'bugfix: switch to BndMPoleSymplectic4RadPass in ohmi envelope (#1014)'. Impact spans improved numerical correctness, reduced debugging time, and clearer traceability.
1 Commits
Nov 1, 2025November 2025 (atcollab/at) – Delivered a critical bug fix in the radiation module that corrects Ohmi envelope calculations by changing the PassMethod from StrMPoleSymplectic4RadPass to BndMPoleSymplectic4RadPass. This fix improves accuracy of radiation-related physics calculations, stability of simulations, and trust in downstream analyses. The change is captured in commit af8528db15f00a4028b3059c02c163a8734e04d4 with message 'bugfix: switch to BndMPoleSymplectic4RadPass in ohmi envelope (#1014)'. Impact spans improved numerical correctness, reduced debugging time, and clearer traceability.
November 2025
October 2025
1 Commits
Oct 1, 2025Month 2025-10: Focused on stabilizing the quantum diffusion matrix calculations in the atcollab/at repository to improve reliability and business value of simulations. Delivered a Quantum Diffusion Matrix Numerical Stability Fix that introduces a symmetric-matrix formulation with reconstruction, and applies an eigenvalue threshold for noise suppression. Also enhanced tests and refined tolerance parameters to ensure stability across scenarios.
October 2025
1 Commits
Oct 1, 2025Month 2025-10: Focused on stabilizing the quantum diffusion matrix calculations in the atcollab/at repository to improve reliability and business value of simulations. Delivered a Quantum Diffusion Matrix Numerical Stability Fix that introduces a symmetric-matrix formulation with reconstruction, and applies an eigenvalue threshold for noise suppression. Also enhanced tests and refined tolerance parameters to ensure stability across scenarios.
September 2025
1 Commits
Sep 1, 2025September 2025 monthly summary for atcollab/at focused on correcting orbit calculations and refactoring to improve reliability and accuracy of reference point handling. No new features released this month; the emphasis was on a critical bug fix and code quality improvements that ensure downstream models and analyses operate on correct orbit data, improving trust and reducing risk of incorrect results.
1 Commits
Sep 1, 2025September 2025 monthly summary for atcollab/at focused on correcting orbit calculations and refactoring to improve reliability and accuracy of reference point handling. No new features released this month; the emphasis was on a critical bug fix and code quality improvements that ensure downstream models and analyses operate on correct orbit data, improving trust and reducing risk of incorrect results.
September 2025
July 2025
2 Commits • 2 Features
Jul 1, 2025In July 2025, delivered GPU-accelerated aperture checks and improved AT code documentation in the atcollab/at repository, driving performance gains and better developer onboarding. Focus areas included enforcing particle-tracking aperture constraints via GPU, and clarifying code behavior for future maintainability.
July 2025
2 Commits • 2 Features
Jul 1, 2025In July 2025, delivered GPU-accelerated aperture checks and improved AT code documentation in the atcollab/at repository, driving performance gains and better developer onboarding. Focus areas included enforcing particle-tracking aperture constraints via GPU, and clarifying code behavior for future maintainability.
June 2025
2 Commits • 2 Features
Jun 1, 2025Monthly summary for 2025-06 focusing on key feature deliveries, major bug fixes, impact, and technical capabilities demonstrated in atcollab/at.
2 Commits • 2 Features
Jun 1, 2025Monthly summary for 2025-06 focusing on key feature deliveries, major bug fixes, impact, and technical capabilities demonstrated in atcollab/at.
June 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 — Delivered Resonance Driving Terms (RDT) support in pyat. Introduced a dedicated rdt module with functions to compute focusing, coupling, chromatic, geometric, and tuneshift RDTs, and updated MATLAB and Python physics modules to integrate RDT functionality and ensure cross-language compatibility. The work is anchored by commit 92a2f73e3a04662e7caa9b2b12aeb8f58da7644a (Compute RDTs (#821)). This enhancement expands resonance analysis capabilities, enabling more accurate modeling and informed design decisions, and sets the foundation for validation and benchmarking workflows across Python and MATLAB toolchains.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 — Delivered Resonance Driving Terms (RDT) support in pyat. Introduced a dedicated rdt module with functions to compute focusing, coupling, chromatic, geometric, and tuneshift RDTs, and updated MATLAB and Python physics modules to integrate RDT functionality and ensure cross-language compatibility. The work is anchored by commit 92a2f73e3a04662e7caa9b2b12aeb8f58da7644a (Compute RDTs (#821)). This enhancement expands resonance analysis capabilities, enabling more accurate modeling and informed design decisions, and sets the foundation for validation and benchmarking workflows across Python and MATLAB toolchains.
Activity
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Quality Metrics
Correctness91.6%
Maintainability84.6%
Architecture85.4%
Performance80.8%
AI Usage24.6%
Skills & Technologies
Programming Languages
CC++MATLABPython
Technical Skills
Accelerator PhysicsC ProgrammingC programmingC++Code RefactoringData SerializationDocumentationGPU ProgrammingLibrary DevelopmentLinear AlgebraMATLAB ScriptingMATLAB programmingNumPy IntegrationNumerical AnalysisObject-Oriented Design
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