ICFA Beam Dynamics Mini Workshop on Modern Optimization of Dynamic Aperture

19 Oct 2026, 09:00 → 23 Oct 2026, 17:00 US/Eastern

Room 401 Physical Sciences (Cornell University)

Christoph Montag (BNL), Georg Hoffstaetter (Cornell)

This workshop will be the first of it's kind, originating from a current need of DA optimization at several accelerator projects, including the EIC, FCC-ee, light sources, and more.  It will be the first occasion to discuss the latest developments in state-of-the-art DA optimization that has been held in many years.  Latest theoretical and experimental developments are of high relevance for Brookhaven's next collider project, the Electron-Ion Collider (EIC), to reach it's required performance in any of it's rings, the HSR, the ESR, the RCS, and possibly the REC. 

Furthermore, the workshop program will include discussion of studies towards the Future Circular Collider (FCC) planned at CERN, and of several light sources, including an upgrade to BNL's NSLS.  In person discussion and presentation related to recent theoretical, computational and experimental advances as well as discovered challenges will provide important input to the development of all these accelerators. 

Topics to Cover: 

• EIC DA optimizations, including EIC, HSR, RCS, and the REC using differential beam dynamics for AI/ML optimization tools.
  
  
• FCC-ee DA optimization
  
  
• Light sources, e.g. NSRL-II, PETRA 4, NSLS-II and upgrades, APS, ALS
  
  
• Dynamic aperture and lifetime optimization in design and during operation
  
  
• Injection optimization in design and during operation
  
  
• Resonant extraction optimization in design and during operation
  
  
• SuperKEKB DA, measurements and simulations
  
  
• LHC RDTs / DA measurements and corrections, including long range beam-beam
  
  
• Design and optimization of HL-LHC and FCCee DA including imperfections and realistic tuning simulations
  
  
• Large computing campaigns and novel DA exploration techniques including ML in Xsuite
  
  
• Online/real-time DA optimizations on operational machines

Monday 19 October

10:00 → 12:00 SciBmad Training Workshop

12:00 → 13:00 Lunch Break (not provided)

13:00 → 17:00 SciBmad Training Workshop

17:00 → 18:30 Meet & Greet and Registration Check-In at the Hilton Garden Inn, Ithaca, NY

Tuesday 20 October

09:00 → 12:00 Future Facilities with DA Needs - Frank Zimmermann (Chair)

09:00 Dynamic Aperture in the Electron Ion Collider

Speaker: Matthew Signorelli (Cornell University)

09:30 HL-LHC Dynamic Aperture

Speaker: Sofia Kostoglou

10:00 FCC-ee nonlinear optics & Dynamic Aperture Optimization

Speaker: Marc Andre Jebramcik (CERN)

10:30 Coffee Break

11:30 Optics design and nonlinear chromaticity correction for the Super Tau Charm Factory Interaction region

12:00 → 13:00 Lunch Break (provided)

13:00 → 17:30 Operational Nonlinear Dynamics Optimization, Model Building and Measurement (Christoph Montag, Chair)

13:00 RHIC Experiences

Speaker: Yun Luo (C-AD, BNL)

13:30 LHC experiences

Speaker: Ewen Maclean (CERN)

14:00 Online optimizations at APS-U, ESRF, SLS-2, SPring-8 (and more)

Speaker: Nikita Kuklev (ANL)

14:30 Coffee Break

15:00 SuperKEKB DA, measurements and simulations

Speaker: Yukiyoshi Ohnishi (KEK)

15:30 Entropy criteria for DA optimization with NSLS-II data

Speaker: Minghao Song (BNL)

16:00 Optimization of an H7BA Lattice for a 2.2-km Future Light Source

Speaker: Peifan Liu (SLAC)

16:30 Dynamic Aperture Optimization in the Presence of Incoherent Beam-Beam Effects

Modern high-luminosity circular e+e- colliders require the interplay between lattice nonlinearities and beam-beam interactions to be considered in dynamic-aperture (DA) optimization in order to achieve the required beam lifetime and overall machine performance. This presentation reviews recent studies of the impact of incoherent beam-beam effects on the DA of crab-waist colliders. It also discusses the principal sources of lattice nonlinearities and the basic theory of incoherent beam-beam tune shifts and resonances in crab-waist collisions. Particular attention is given to how beam-beam interactions modify single-particle dynamics and resonance structures, and to the resulting implications for nonlinear lattice optimization.

Speaker: Demin Zhou (KEK)

17:00 Contributed Talk

Wednesday 21 October

09:00 → 12:10 Early Indicators and Long-term Stability (Joseph Scott Berg, Chair)

09:00 Open discussion: early indicators of reduced dynamic aperture and their utility - discussion leader Scott

Speaker: J. Scott Berg (Brookhaven National Laboratory)

09:20 Island Population in Light Sources for TRIBS

Speaker: Suntao Wang (Cornell University)

09:40 Full one-tori analysis

Speaker: Matthew Signorelli (Cornell University)

10:00 Approximate invariant analysis for nonlinear beam dynamics

Speaker: Yonglun Li (BNL)

10:20 Coffee Break

10:50 Neural normal form for storage ring

Speaker: Yunhai Cai (SLAC)

11:10 DA Optimization with machine learning for SuperKEKB

Speaker: Taichiro Koga (KEK)

11:30 ML method for DA training

Speaker: Derong Xu (Brookhaven National Laboratory)

11:50 Resonant extraction simulation and optimization

Speaker: Eiad Hamwi (Cornell University)

12:10 → 13:10 Lunch Break (provided)

15:00 → 18:00 Banquet at Treman State Park - Dinosaur BBQ

Thursday 22 October

09:00 → 12:00 HPC/advanced computing for nonlinear dynamics optimization (Matt Signorelli, Chair)

09:00 Large computing campaigns and novel DA exploration techniques including ML in Xsuite

Speaker: Leon Van Riesen-Haupt

09:30 Open discussion: the derivatives beyond first order and TPSA for accelerators

Speaker: Georg Hoffstaetter (Cornell)

10:00 GPU parallelization and parallelization over accelerators rather than particles

Speaker: Joseph Devlin (alum@cornell.edu;member@cornell.edu;student@cornell.edu)

10:30 Coffee Break

11:00 Heavy parallelization for injection efficiency and lifetime simulation in APS

Speakers: Louis Emery, Michael Borland (ANL)

11:30 (ASPIRATIONAL) AmSC and shared infrastructures

12:00 → 13:00 Lunch Break (provided)

13:00 → 17:30 Modern software and techniques for nonlinear dynamics optimization and analysis (Kevin Brown, Chair)

13:00 Nonlinear dynamics optimization tools for nonlinear driving term integrals, incl. Elegant, OPA, etc.

13:30 Nonlinear dynamics with high-order maps and normal forms, e.g., MAD-NG, SciBmad, COSY, PTC with Bmad and MAD-X, SAD

Speaker: Etienne Forest

14:00 Code requirements for modern ML, NN, RL optimization of nonlinear dynamics

Speaker: Xiaobiao Huang (SLAC)

14:30 Coffee Break

15:00 Injection optimization in design and during operation with Badger

Speaker: Eiad Hamwi (Cornell University)

15:30 Discussion time

16:00 DA/MA with agentic AI and BAX

Speaker: Steerenberg Noa

16:30 ML optimization of nonlinear dynamics in current and future accelerators

Speaker: Matthias Remta

17:00 Contributed Talk

Friday 23 October

09:00 → 12:00 Closeout (Georg Hoffstaetter de Torquat, Chair)

09:00 Summary; Collaboration needs; discussion and preparation of joint paper

Speaker: Georg Hoffstaetter (Cornell)

12:00 → 13:00 Lunch Break (provided)