Sustainability of the Merlin++ particle tracking code

Scott Rowan, Sam Tygier, Yuanfang Cai, Colin C. Venters, Richard Appleby, Roger Barlow

Research output: Contribution to journalConference articlepeer-review


Merlin++ is a C++ particle accelerator and particle tracking library originally developed at DESY for use in International Linear Collider (ILC) simulations. Merlin++ has more recently been adapted for High-Luminosity Large Hadron Collider (HL-LHC) collimation studies, utilizing advanced scattering physics. However, as is all too common in long-standing high-energy physics software, recent developments have focused on functional additions rather than code design and maintainability. This has resulted in usability issues for users and developers alike. The following presents recent improvements in adhering to modern software sustainability practices to address these issues. Quantifiable improvements in code complexity and maintainability are presented via appropriate test metrics and the evolution of the software architecture
is analyzed. Experiences and conclusions of applying modern sustainability methodology to longstanding scientific software are discussed.
Original languageEnglish
Article number05028
Number of pages8
JournalEPJ Web of Conferences
Early online date17 Sep 2019
Publication statusPublished - 2019
Event23rd International Conference on Computing in High Energy and Nuclear Physics - National Palace of Culture, Sofia, Bulgaria
Duration: 9 Jul 201813 Jul 2018


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  • Merlin++

    Appleby, R. B., Barlow, R., Bungau, A., Fallon, J., Krücker, D., Molson, J., Rafique, H., Rowan, S., Serluca, M., Sjøbæk, K. N., Toader, A., Tygier, S., Walker, N. & Wolski, A., 6 Mar 2020

    Research output: Non-textual formSoftware

    Open Access

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