ACTS4NP - Workshop on ACTS Tracking for Nuclear Physics 2025

12 May 2025, 08:40 → 15 May 2025, 18:00 US/Pacific

NERSC building (B59-3101) (Lawrence Berkeley National Laboratory)

Corentin Allaire (IJCLab, Université Paris-Saclay, CNRS/IN2P3), Shujie Li (Berkeley Lab)

The first ACTS Tracking for Nuclear Physics 2025 (ACTS4NP) workshop aims to bridge the ACTS tracking software community and nuclear physics experiments that might want to (or already) use ACTS for particle trajectory reconstruction in their detectors. We also encourage members of HEP, dark matter, and other physics communities to attend and share their experiences on track reconstructions!

In this workshop, ACTS experts from France and CERN will be present in person to facilitate discussions and hands-on work on ACTS implementation and tutorials. There will also be a mini-symposium on tracking with GPU and AI/ML. 

 Zoom info: 

Meeting ID: 944 9960 0303

password: workshop name in lower case (7 characters)

Venue

 This workshop will be hosted at Lawrence Berkelely National Lab. 
    •   May 12-13: B70A-3377
    •   May 14-15: B59-3101 (NERSC building) 

Registration  

Attention: the registration is reopened to accommodate online participants (who can connect to some but not all presentation sessions). Please contact the organizer before you submit a new in-person application. 

We welcome participants from nuclear physics and related areas.  This workshop is supported by the France-Berkeley Fund. Registration is free. Please submit your registration at your earliest convinience so that we have time to process your Berkeley Lab site access.

    • Registration deadline: March 15, 2025. 

    • You could register with "remote" option to receive zoom link for presentation sessions later.

    • Time slots for short contribution talks are available. 

    • Lunch box will be provided.

    • Please indicate if you are interested in the off-site social dinner, and LBNL tours.

Agenda  

The agenda is under development. A large fraction of the time will be reserved for in-person discussion and hands-on sessions dedicated to using and contributing to ACTS. 
 
There will be topical discussions in the afternoons (e.g. EIC, telescope-type detector, drift chamber/TPC). If there is a specific subject you would be interested in seeing discussed, don't hesitate to bring it up to the organisers.
 
Letter of Invitation: If you need a letter of Invitation to the workshop, please get in touch with the organisers.

 

This event is supported by the France-Berkeley Fund

 

 

ACTS4NP2025_flyer.pdf

Monday 12 May

08:40 Registration

Introduction

Convener: Shujie Li (Berkeley Lab)

ACTS4NP_closeout.pdf

Presentation: ACTS project

1 ACTS Overview

Speakers: Andreas Salzburger (CERN), Corentin Allaire (IJCLab, Université Paris-Saclay, CNRS/IN2P3)

2025-05-12-ACTS-Project.pdf

10:30 Break

2 Integration in an experiment: The ATLAS example

Speaker: Paul Gessinger (CERN)

2025-05-12_acts-integration-into-atlas_v3.pdf

ACTS4NP_05122025AM.mp4

Lunch

Experiment specific discussion: Updates

Convener: Andreas Salzburger (CERN)

3 ACTS tracking for EIC-ePIC detector

Speaker: Dmitry Kalinkin

ACTS tracking for EIC-ePIC detector.pdf

4 Development of ACTS based tracking for multi-TPC at Tagged Deep Inelastic Scattering experiment

Speaker: Dmitry Romanov

2025-05-12 ACTS4NP TDIS Development.pdf

2025-05-12 ACTS4NP TDIS Development.pptx

5 LDMX

Speaker: Elizabeth Berzin (Stanford University)

ACTS4NP_LDMX.pdf

6 Tracking for SoLID

Speaker: Zhongling Ji (Syracuse University)

ZhonglingJi-SoLID-tracking.pdf

7 PIONEER: A next generation rare pion decay experiment relying on 5D tracking

The next generation rare pion decay experiment PIONEER aims to test LFU by measuringR_{e\mu}= BR(\pi -> e \nu(\gamma)) / BR(\pi->\mu\nu (\gamma)) to a precision of 0.01% in phase I and provide insights on CKM unitarity through probing pion beta decay in phase II. To achieve this goal, the experimental design incorporates lessons learned from the predecessors PIENU and PEN/PIBETA. In this talk, I will cover the main experimental improvements with respect to those predecessor experiments - most notably a highly segmented active target with 5D tracking capabilities. I will also highlight the challenges in the event reconstruction and analysis to achieve the order of magnitude improvement in precision for phase I and how track information from the active target will help us to overcome those challenges.

Speaker: Patrick Schwendimann

ACTS_Schwendimann_PIONEER.pdf

15:35 Break

Hands-on session: Discussions: Topics for the hands-on

ACTSVG_onODD.md

19:00 Workshop Dinner

Tuesday 13 May

08:40 Coffee break

Experiment specific discussion: breakroom discussions (contact the organisers)

Tour to NERSC and 88inch Cyclotron

8 NERSC

9 88inch

Lunch: Lunch at the Guest House (B23)

Tutorial: Installing, using and contributing to ACTS

10 Tutorial: Installing, using and contributing to ACTS

Speaker: Paul Gessinger (CERN)

2025-05-12_odd_chain_tutorial_v3.pdf

ACTS4NP_05132025PM_tutorial_reconstruction.mp4

15:30 Break

Hands-on session: Hands-on / Discussions

ACTSVG_onODD.md

Wednesday 14 May

08:40 Coffee break

Topical discussion: Users Experiences

Convener: Shujie Li (Berkeley Lab)

11 Data structure: Interfacing ACTS and your experiement

Speaker: Wouter Deconinck

Google Slides

Google Slides

10:15 Break: group photo

12 Detector alignment

Speaker: Joe Osborn (Brookhaven National Laboratory)

ACTS4NP_Alignment.pdf

Lunch

Tutorial: Detector geometry and ODD

Convener: Paul Gessinger (CERN)

13 Detector geometry and ODD

Speaker: Paul Gessinger (CERN)

2025-05-12_trk_geometry_v2.pdf

ACTS4NP_05142025PM_part2_geo_tutorial.mp4

15:00 Break

Topical discussion: Algorithm Development

14 Low-momentum tracking efficiency

Speaker: Barak Schmookler

acts_seeding_051425.pdf

15 Track projection to non-tracking detector, and resolution evaluation

Speakers: Matt Posik (Temple University), Wouter Deconinck

2025_05_14_posik.pdf

Track Propagation to Calorimeters in EIC (Google Slides)

Hands-on session: Hands-on / Discussions

ACTSVG_onODD.md

Thursday 15 May

08:40 Coffee break

Topical discussion: Topical discussion: ML/DL for Tracking

Convener: Corentin Allaire (IJCLab, Université Paris-Saclay, CNRS/IN2P3)

16 ACTS algorithms (Ambiguity solver)

Speaker: Corentin Allaire (IJCLab, Université Paris-Saclay, CNRS/IN2P3)

Ranking-based-Seeding.pdf

17 Exploring new directions in enhancing the ACTS parameter optimization suite

Particle tracking is among the most sophisticated and complex parts of the full event reconstruction chain. Various reconstruction algorithms work in sequence to build trajectories from detector hits. Each of these algorithms requires numerous configuration parameters that need fine-tuning to properly account for the detector/experimental setup, the available CPU budget, and the desired physics performance. To automate and optimize the tuning of these parameters, automatic parameter optimization techniques were implemented in “A Common Tracking Software” (ACTS) framework, the open-source track reconstruction software framework. These techniques allow users to flexibly choose tunable parameters and define a cost/benefit function for optimizing the full reconstruction chain. Since their implementation, these techniques have been greatly beneficial for researchers across various experiments. This study discusses ongoing advancements in these optimization techniques, including novel approaches that enable a more systematic and gradual refinement of parameter tuning. Specifically, I will explore the integration of Bayesian Optimization techniques for tracking algorithm tuning, highlighting their potential to improve efficiency and precision beyond existing methods.

Speaker: Rocky Bala Garg (Stanford University (US))

ACTS4NP_RBG_May15th.pdf

ACTS4NP_RBG_May15th.pdf

ACTS4NP_RBG_May15th.pptx

10:00 Break

18 Graph Neural Network

Speaker: Jay Chan (LBNL)

ACTS4NP2025.pdf

19 Discussion: ML/DL with ACTS

Lunch

GPU Tracking: Presentation

Convener: Beomki Yeo (University of California Berkeley (US))

20 Introduction to traccc

Speaker: Beomki Yeo (University of California Berkeley (US))

traccc.pdf

21 detray

Speaker: Joana Niermann (CERN)

ACTS4NP_2025_detray.pdf

22 Geometry alignment

Speaker: Vakho Tsulaia (Lawrence Berkeley National Lab. (US))

DetrayAlignment.pdf

14:45 Break

GPU Tracking: Discussion

Convener: Beomki Yeo (University of California Berkeley (US))

23 [Discussion] GNN + traccc pipeline

Speaker: Xiangyang Ju (Lawrence Berkeley National Lab. (US))

20250514GNN+Traccc.pdf

24 [Discussion] Application to Celeritas (Simulation tool)

Speaker: Julien Esseiva (Lawrence Berkeley National Lab. (US))

acts-celeritas-discussion-points.pdf

25 Q&A

Introduction: Closing words

ACTS4NP_closeout.pdf