ACTS Developers Meeting

Tuesday 19 May 2026, 17:00 → 18:00 Europe/Zurich

ZOOM ONLY

Alexander J Pfleger (University of Innsbruck (AT)), Andreas Salzburger (CERN)

General discussion on developments in Acts.

Zoom passcode is visible for logged in users, if you don't have an account and want to join, let us know at acts-developers@cern.ch

17:00 → 17:20 Discussion: Config build components detray/GPU/...

What's the outlook for detray?
Probably keep it separate and just have it inside ACTS for easier testing and integration.
Should we follow the same for traccc? -> traccc should become a full component of ACTS and used with `ACTS addlibrary`
Roadmap to import:
copy in the code once and make changes later to have a cleaner diff.
CI should become part of ACTS CI. -> But is the code then well tested for these temporary commits?
most important traccc should be a full component of ACTS

Look also at
https://github.com/acts-project/acts/pull/5462

Goal maybe to have 2 repos upto date all the time and mutually compatible?

Big problem currently when co-developing detray and traccc because versions depend on each other. instead of relying on tags we need hashes now.
Any breaking change in ACTS messes with traccc.

Currently traccc is not properly working in athena and G200, so maybe there is not a lot to break at all.

The external build in athena seems like a technicality and just needs to be made working

Idea: make traccc tag and prepare PR tomorrow?

we need to put traccc into athena soon no matter which track we choose. many feel happier of doing it directly from acts.

in case we copy, how is the traccc developer workflow? -> should be fine

joana: convenience of tagging whenever is gone -> rethink tagging-frequency in ACTS

Decision: go ahead
1. tag traccc tomorrow
2. copy traccc to ACTS && start with athena integration
... (naming and build config comes a bit later)
4. profit

caveat: be quick that only few patches need to be done in both repos.

17:20 → 17:40 PR Recap

Speaker: Alexander J Pfleger (University of Innsbruck (AT))

slides-pr-recap-2026-05-19.pdf

17:40 → 18:00 Round table